Create other data keys

84 files changed, 439 insertions, 356 deletions

diff --git a/src/org/traccar/protocol/ApelProtocolDecoder.java b/src/org/traccar/protocol/ApelProtocolDecoder.java
index 75153d0d8..b814f60e3 100644
--- a/src/org/traccar/protocol/ApelProtocolDecoder.java
+++ b/src/org/traccar/protocol/ApelProtocolDecoder.java
@@ -30,6 +30,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Crc;
 import org.traccar.helper.Log;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class ApelProtocolDecoder extends BaseProtocolDecoder {
@@ -166,7 +167,7 @@ public class ApelProtocolDecoder extends BaseProtocolDecoder {
                 if (type == MSG_TYPE_LOG_RECORDS) {
                     position.set("archive", true);
                     lastIndex = buf.readUnsignedInt() + 1;
-                    position.set("index", lastIndex);
+                    position.set(Event.KEY_INDEX, lastIndex);
 
                     subtype = buf.readUnsignedShort();
                     if (subtype != MSG_TYPE_CURRENT_GPS_DATA && subtype != MSG_TYPE_STATE_FULL_INFO_T104) {
@@ -193,7 +194,7 @@ public class ApelProtocolDecoder extends BaseProtocolDecoder {
                     int speed = buf.readUnsignedByte();
                     position.setValid(speed != 255);
                     position.setSpeed(speed * 0.539957);
-                    position.set("hdop", buf.readByte());
+                    position.set(Event.KEY_HDOP, buf.readByte());
                 } else {
                     int speed = buf.readShort();
                     position.setValid(speed != -1);
@@ -209,20 +210,20 @@ public class ApelProtocolDecoder extends BaseProtocolDecoder {
                 if (subtype == MSG_TYPE_STATE_FULL_INFO_T104) {
 
                     // Satellites
-                    position.set("satellites", buf.readUnsignedByte());
+                    position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
                     
                     // Cell signal
-                    position.set("gsm", buf.readUnsignedByte());
+                    position.set(Event.KEY_GSM, buf.readUnsignedByte());
 
                     // Event type
-                    position.set("event", buf.readUnsignedShort());
+                    position.set(Event.KEY_EVENT, buf.readUnsignedShort());
 
-                    // Milage
-                    position.set("milage", buf.readUnsignedInt());
+                    // Odometer
+                    position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
 
                     // Input/Output
-                    position.set("input", buf.readUnsignedByte());
-                    position.set("output", buf.readUnsignedByte());
+                    position.set(Event.KEY_INPUT, buf.readUnsignedByte());
+                    position.set(Event.KEY_OUTPUT, buf.readUnsignedByte());
                     
                     // Analog sensors
                     for (int i = 1; i <= 8; i++) {
diff --git a/src/org/traccar/protocol/AplicomProtocolDecoder.java b/src/org/traccar/protocol/AplicomProtocolDecoder.java
index 60eb7a74c..7170731f5 100644
--- a/src/org/traccar/protocol/AplicomProtocolDecoder.java
+++ b/src/org/traccar/protocol/AplicomProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.Context;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class AplicomProtocolDecoder extends BaseProtocolDecoder {
@@ -138,7 +139,7 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
 
         // Event
         int event = buf.readUnsignedByte();
-        position.set("event", event);
+        position.set(Event.KEY_EVENT, event);
         buf.readUnsignedByte();
 
         // Validity
@@ -158,7 +159,7 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
             position.setTime(new Date(buf.readUnsignedInt() * 1000));
             position.setLatitude(buf.readInt() / 1000000.0);
             position.setLongitude(buf.readInt() / 1000000.0);
-            position.set("satellites", buf.readUnsignedByte());
+            position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
         }
 
         // Speed and heading
@@ -170,7 +171,7 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
 
         // Input
         if ((selector & 0x0040) != 0) {
-            position.set("input", buf.readUnsignedByte());
+            position.set(Event.KEY_INPUT, buf.readUnsignedByte());
         }
         
         // ADC
@@ -183,8 +184,8 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
 
         // Power
         if ((selector & 0x8000) != 0) {
-            position.set("power", buf.readUnsignedShort() / 1000.0);
-            position.set("battery", buf.readUnsignedShort());
+            position.set(Event.KEY_POWER, buf.readUnsignedShort() / 1000.0);
+            position.set(Event.KEY_BATTERY, buf.readUnsignedShort());
         }
         
         // Pulse rate 1
@@ -211,7 +212,7 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
 
         // Output
         if ((selector & 0x0040) != 0) {
-            position.set("output", buf.readUnsignedByte());
+            position.set(Event.KEY_OUTPUT, buf.readUnsignedByte());
         }
         
         // Button
@@ -306,7 +307,7 @@ public class AplicomProtocolDecoder extends BaseProtocolDecoder {
                     case 0x20D:
                         position.set("diesel-rpm", ChannelBuffers.swapShort(value.readShort()));
                         position.set("diesel-temperature", ChannelBuffers.swapShort(value.readShort()) * 0.1);
-                        position.set("battery", ChannelBuffers.swapShort(value.readShort()) * 0.01);
+                        position.set(Event.KEY_BATTERY, ChannelBuffers.swapShort(value.readShort()) * 0.01);
                         position.set("air-temperature", ChannelBuffers.swapShort(value.readShort()) * 0.1);
                         break;
                     case 0x30D:
diff --git a/src/org/traccar/protocol/Ardi01ProtocolDecoder.java b/src/org/traccar/protocol/Ardi01ProtocolDecoder.java
index 8e1185d25..6797eb01e 100644
--- a/src/org/traccar/protocol/Ardi01ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Ardi01ProtocolDecoder.java
@@ -18,6 +18,7 @@ package org.traccar.protocol;
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.util.Calendar;
@@ -90,16 +91,16 @@ public class Ardi01ProtocolDecoder extends BaseProtocolDecoder {
         // Satellites
         int satellites = Integer.valueOf(parser.group(index++));
         position.setValid(satellites >= 3);
-        position.set("satellites", satellites);
+        position.set(Event.KEY_SATELLITES, satellites);
         
         // Event
-        position.set("event", parser.group(index++));
+        position.set(Event.KEY_EVENT, parser.group(index++));
 
         // Input
-        position.set("battery", parser.group(index++));
+        position.set(Event.KEY_BATTERY, parser.group(index++));
 
         // Output
-        position.set("temperature", parser.group(index++));
+        position.set(Event.KEY_TEMPERATURE, parser.group(index++));
 
         return position;
     }
diff --git a/src/org/traccar/protocol/AtrackProtocolDecoder.java b/src/org/traccar/protocol/AtrackProtocolDecoder.java
index b898d9e92..5ccd8ed30 100644
--- a/src/org/traccar/protocol/AtrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/AtrackProtocolDecoder.java
@@ -27,6 +27,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class AtrackProtocolDecoder extends BaseProtocolDecoder {
@@ -120,20 +121,20 @@ public class AtrackProtocolDecoder extends BaseProtocolDecoder {
             // Report type
             position.set("type", buf.readUnsignedByte());
 
-            // Milage
-            position.set("milage", buf.readUnsignedInt() * 0.1);
+            // Odometer
+            position.set(Event.KEY_ODOMETER, buf.readUnsignedInt() * 0.1);
 
             // Accuracy
-            position.set("hdop", buf.readUnsignedShort() * 0.1);
+            position.set(Event.KEY_HDOP, buf.readUnsignedShort() * 0.1);
 
             // Input
-            position.set("input", buf.readUnsignedByte());
+            position.set(Event.KEY_INPUT, buf.readUnsignedByte());
 
             // Speed
             position.setSpeed(buf.readUnsignedShort() * 0.539957);
 
             // Output
-            position.set("output", buf.readUnsignedByte());
+            position.set(Event.KEY_OUTPUT, buf.readUnsignedByte());
 
             // ADC
             position.set("adc", buf.readUnsignedShort() * 0.001);
diff --git a/src/org/traccar/protocol/AutoFon45ProtocolDecoder.java b/src/org/traccar/protocol/AutoFon45ProtocolDecoder.java
index 3b56c8fc4..1a2ebdf4a 100644
--- a/src/org/traccar/protocol/AutoFon45ProtocolDecoder.java
+++ b/src/org/traccar/protocol/AutoFon45ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.util.*;
@@ -70,12 +71,12 @@ public class AutoFon45ProtocolDecoder extends BaseProtocolDecoder {
             position.setDeviceId(getDeviceId());
 
             short status = buf.readUnsignedByte();
-            position.set("alarm", (status & 0x80) != 0);
-            position.set("battery", status & 0x7F);
+            position.set(Event.KEY_ALARM, (status & 0x80) != 0);
+            position.set(Event.KEY_BATTERY, status & 0x7F);
 
             buf.skipBytes(2); // remaining time
 
-            position.set("temperature", buf.readByte());
+            position.set(Event.KEY_TEMPERATURE, buf.readByte());
 
             buf.skipBytes(2); // timer (interval and units)
             buf.readByte(); // mode
@@ -86,7 +87,7 @@ public class AutoFon45ProtocolDecoder extends BaseProtocolDecoder {
             // GPS status
             int valid = buf.readUnsignedByte();
             position.setValid((valid & 0xc0) != 0);
-            position.set("satellites", valid & 0x3f);
+            position.set(Event.KEY_SATELLITES, valid & 0x3f);
 
             // Date and time
             int timeOfDay = buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte();
diff --git a/src/org/traccar/protocol/AutoFonProtocolDecoder.java b/src/org/traccar/protocol/AutoFonProtocolDecoder.java
index ceeb0b29d..856b19bc8 100644
--- a/src/org/traccar/protocol/AutoFonProtocolDecoder.java
+++ b/src/org/traccar/protocol/AutoFonProtocolDecoder.java
@@ -21,6 +21,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.util.*;
@@ -56,7 +57,7 @@ public class AutoFonProtocolDecoder extends BaseProtocolDecoder {
         if (!history) {
             buf.readUnsignedShort();
         }
-        position.set("battery", buf.readUnsignedByte());
+        position.set(Event.KEY_BATTERY, buf.readUnsignedByte());
         buf.skipBytes(6); // time
 
         // Timers
@@ -68,8 +69,8 @@ public class AutoFonProtocolDecoder extends BaseProtocolDecoder {
             }
         }
 
-        position.set("temperature", buf.readByte());
-        position.set("gsm", buf.readUnsignedByte());
+        position.set(Event.KEY_TEMPERATURE, buf.readByte());
+        position.set(Event.KEY_GSM, buf.readUnsignedByte());
         buf.readUnsignedShort(); // mcc
         buf.readUnsignedShort(); // mnc
         buf.readUnsignedShort(); // lac
@@ -78,7 +79,7 @@ public class AutoFonProtocolDecoder extends BaseProtocolDecoder {
         // GPS status
         int valid = buf.readUnsignedByte();
         position.setValid((valid & 0xc0) != 0);
-        position.set("satellites", valid & 0x3f);
+        position.set(Event.KEY_SATELLITES, valid & 0x3f);
 
         // Date and time
         Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
@@ -98,7 +99,7 @@ public class AutoFonProtocolDecoder extends BaseProtocolDecoder {
         position.setSpeed(buf.readUnsignedByte());
         position.setCourse(buf.readUnsignedByte() * 2.0);
 
-        position.set("hdop", buf.readUnsignedShort());
+        position.set(Event.KEY_HDOP, buf.readUnsignedShort());
 
         buf.readUnsignedShort(); // reserved
         buf.readUnsignedByte(); // checksum
diff --git a/src/org/traccar/protocol/Avl301ProtocolDecoder.java b/src/org/traccar/protocol/Avl301ProtocolDecoder.java
index c74e10f5e..7a53c3d3f 100644
--- a/src/org/traccar/protocol/Avl301ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Avl301ProtocolDecoder.java
@@ -20,6 +20,7 @@ import org.jboss.netty.buffer.ChannelBuffers;
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.util.Calendar;
@@ -99,7 +100,7 @@ public class Avl301ProtocolDecoder extends BaseProtocolDecoder {
 
             // GPS length and Satellites count
             int gpsLength = buf.readUnsignedByte();
-            position.set("satellites", gpsLength & 0xf);
+            position.set(Event.KEY_SATELLITES, gpsLength & 0xf);
             gpsLength >>= 4;
 
             //Skip Satellite numbers
@@ -124,16 +125,16 @@ public class Avl301ProtocolDecoder extends BaseProtocolDecoder {
                 position.set("acc", (union & 0x8000) != 0);
             }
 
-            position.set("lac", buf.readUnsignedShort());
-            position.set("cell", buf.readUnsignedMedium());
-            position.set("alarm", true);
+            position.set(Event.KEY_LAC, buf.readUnsignedShort());
+            position.set(Event.KEY_CELL, buf.readUnsignedMedium());
+            position.set(Event.KEY_ALARM, true);
             int flags = buf.readUnsignedByte();
             position.set("acc", (flags & 0x2) != 0);
 
             // TODO parse other flags
 
-            position.set("power", buf.readUnsignedByte());
-            position.set("gsm", buf.readUnsignedByte());
+            position.set(Event.KEY_POWER, buf.readUnsignedByte());
+            position.set(Event.KEY_GSM, buf.readUnsignedByte());
             return position;
         }
 
diff --git a/src/org/traccar/protocol/BceProtocolDecoder.java b/src/org/traccar/protocol/BceProtocolDecoder.java
index 28570b63c..5baafd9dd 100644
--- a/src/org/traccar/protocol/BceProtocolDecoder.java
+++ b/src/org/traccar/protocol/BceProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.buffer.ChannelBuffers;
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class BceProtocolDecoder extends BaseProtocolDecoder {
@@ -97,17 +98,17 @@ public class BceProtocolDecoder extends BaseProtocolDecoder {
                         position.setSpeed(buf.readUnsignedByte());
 
                         int gps = buf.readUnsignedByte();
-                        position.set("satellites", gps & 0xf);
-                        position.set("hdop", gps >> 4);
+                        position.set(Event.KEY_SATELLITES, gps & 0xf);
+                        position.set(Event.KEY_HDOP, gps >> 4);
 
                         position.setCourse(buf.readUnsignedByte());
                         position.setAltitude(buf.readUnsignedShort());
 
-                        position.set("milage", buf.readUnsignedInt());
+                        position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
                     }
 
                     if (checkBit(mask, 1)) {
-                        position.set("input", buf.readUnsignedShort());
+                        position.set(Event.KEY_INPUT, buf.readUnsignedShort());
                     }
 
                     for (int i = 1; i <= 8; i++) {
@@ -122,11 +123,11 @@ public class BceProtocolDecoder extends BaseProtocolDecoder {
                     if (checkBit(mask, 13)) buf.skipBytes(2);
 
                     if (checkBit(mask, 14)) {
-                        position.set("mcc", buf.readUnsignedShort());
-                        position.set("mnc", buf.readUnsignedByte());
-                        position.set("lac", buf.readUnsignedShort());
-                        position.set("cell", buf.readUnsignedShort());
-                        position.set("gsm", buf.readUnsignedByte());
+                        position.set(Event.KEY_MCC, buf.readUnsignedShort());
+                        position.set(Event.KEY_MNC, buf.readUnsignedByte());
+                        position.set(Event.KEY_LAC, buf.readUnsignedShort());
+                        position.set(Event.KEY_CELL, buf.readUnsignedShort());
+                        position.set(Event.KEY_GSM, buf.readUnsignedByte());
                         buf.readUnsignedByte();
                     }
 
diff --git a/src/org/traccar/protocol/BoxProtocolDecoder.java b/src/org/traccar/protocol/BoxProtocolDecoder.java
index a34c13a58..b7e30733c 100644
--- a/src/org/traccar/protocol/BoxProtocolDecoder.java
+++ b/src/org/traccar/protocol/BoxProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class BoxProtocolDecoder extends BaseProtocolDecoder {
@@ -93,15 +94,15 @@ public class BoxProtocolDecoder extends BaseProtocolDecoder {
             position.setCourse(Double.valueOf(parser.group(index++)));
             
             // Distance
-            position.set("milage", parser.group(index++));
+            position.set(Event.KEY_ODOMETER, parser.group(index++));
             
             // Event
-            position.set("event", parser.group(index++));
+            position.set(Event.KEY_EVENT, parser.group(index++));
             
             // Status
             int status = Integer.valueOf(parser.group(index++));
             position.setValid((status & 0x04) == 0);
-            position.set("status", status);
+            position.set(Event.KEY_STATUS, status);
             return position;
         }
         
diff --git a/src/org/traccar/protocol/CalAmpProtocolDecoder.java b/src/org/traccar/protocol/CalAmpProtocolDecoder.java
index 7cf5031f3..f5362f705 100644
--- a/src/org/traccar/protocol/CalAmpProtocolDecoder.java
+++ b/src/org/traccar/protocol/CalAmpProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.jboss.netty.channel.Channels;
 import org.jboss.netty.channel.MessageEvent;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class CalAmpProtocolDecoder extends BaseProtocolDecoder {
@@ -178,10 +179,10 @@ public class CalAmpProtocolDecoder extends BaseProtocolDecoder {
 
             // Fix status
             if (type == MSG_MINI_EVENT_REPORT) {
-                position.set("satellites", buf.getUnsignedByte(buf.readerIndex()) & 0xf);
+                position.set(Event.KEY_SATELLITES, buf.getUnsignedByte(buf.readerIndex()) & 0xf);
                 position.setValid((buf.readUnsignedByte() & 0x20) == 0);
             } else {
-                position.set("satellites", buf.readUnsignedByte());
+                position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
                 position.setValid((buf.readUnsignedByte() & 0x08) == 0);
             }
 
@@ -191,7 +192,7 @@ public class CalAmpProtocolDecoder extends BaseProtocolDecoder {
                 position.set("carrier", buf.readUnsignedShort());
 
                 // Cell signal
-                position.set("gsm", buf.readShort());
+                position.set(Event.KEY_GSM, buf.readShort());
 
             }
 
@@ -200,20 +201,20 @@ public class CalAmpProtocolDecoder extends BaseProtocolDecoder {
 
             // HDOP
             if (type != MSG_MINI_EVENT_REPORT) {
-                position.set("hdop", buf.readUnsignedByte());
+                position.set(Event.KEY_HDOP, buf.readUnsignedByte());
             }
 
             // Inputs
-            position.set("input", buf.readUnsignedByte());
+            position.set(Event.KEY_INPUT, buf.readUnsignedByte());
 
             // Unit status
             if (type != MSG_MINI_EVENT_REPORT) {
-                position.set("status", buf.readUnsignedByte());
+                position.set(Event.KEY_STATUS, buf.readUnsignedByte());
             }
 
             // Event code and status
             if (type == MSG_EVENT_REPORT || type == MSG_MINI_EVENT_REPORT) {
-                position.set("event", buf.readUnsignedByte() + " - " + buf.readUnsignedByte());
+                position.set(Event.KEY_EVENT, buf.readUnsignedByte() + " - " + buf.readUnsignedByte());
             }
 
             // Accumulators
diff --git a/src/org/traccar/protocol/CarTrackProtocolDecoder.java b/src/org/traccar/protocol/CarTrackProtocolDecoder.java
index b88f9840d..06f1e5342 100644
--- a/src/org/traccar/protocol/CarTrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/CarTrackProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class CarTrackProtocolDecoder extends BaseProtocolDecoder {
@@ -124,19 +125,18 @@ public class CarTrackProtocolDecoder extends BaseProtocolDecoder {
         
         // State
         position.set("io", parser.group(index++));
-        /* Start : Added By Rohit Singhal, Decode Milage Data*/
-        // Prepare Mile Meter Data
-        String milage = parser.group(index++);
-        milage = milage.replace(":", "A");
-        milage = milage.replace(";", "B");
-        milage = milage.replace("<", "C");
-        milage = milage.replace("=", "D");
-        milage = milage.replace(">", "E");
-        milage = milage.replace("?", "F");
-        position.set("milage", Integer.parseInt(milage, 16));
-        /* Commented By Rohit position.set("milage", parser.group(index++)); */
-        /*End : Added By Rohit Singhal, Decode Milage Data*/
-        position.set("alarm", parser.group(index++));
+
+        // Odometer
+        String odometer = parser.group(index++);
+        odometer = odometer.replace(":", "A");
+        odometer = odometer.replace(";", "B");
+        odometer = odometer.replace("<", "C");
+        odometer = odometer.replace("=", "D");
+        odometer = odometer.replace(">", "E");
+        odometer = odometer.replace("?", "F");
+        position.set(Event.KEY_ODOMETER, Integer.parseInt(odometer, 16));
+
+        position.set(Event.KEY_ALARM, parser.group(index++));
         position.set("ad", parser.group(index++));
         return position;
     }
diff --git a/src/org/traccar/protocol/CarscopProtocolDecoder.java b/src/org/traccar/protocol/CarscopProtocolDecoder.java
index 2e912961c..6270a2804 100644
--- a/src/org/traccar/protocol/CarscopProtocolDecoder.java
+++ b/src/org/traccar/protocol/CarscopProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class CarscopProtocolDecoder extends BaseProtocolDecoder {
@@ -44,7 +45,7 @@ public class CarscopProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{2})(\\d{2})(\\d{2})" + // Date (YYMMDD)
             "(\\d{3}\\.\\d{2})" +        // Course
             "(\\d{8})" +                 // State
-            "L(\\d{6})");                // Milage
+            "L(\\d{6})");                // Odometer
 
     @Override
     protected Object decode(
@@ -112,8 +113,8 @@ public class CarscopProtocolDecoder extends BaseProtocolDecoder {
         // State
         position.set("state", parser.group(index++));
 
-        // Milage
-        position.set("milage", Integer.valueOf(parser.group(index++)));
+        // Odometer
+        position.set(Event.KEY_ODOMETER, Integer.valueOf(parser.group(index++)));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/CellocatorProtocolDecoder.java b/src/org/traccar/protocol/CellocatorProtocolDecoder.java
index 2fac487c4..70d5d7c62 100644
--- a/src/org/traccar/protocol/CellocatorProtocolDecoder.java
+++ b/src/org/traccar/protocol/CellocatorProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class CellocatorProtocolDecoder extends BaseProtocolDecoder {
@@ -115,7 +116,7 @@ public class CellocatorProtocolDecoder extends BaseProtocolDecoder {
             buf.readUnsignedByte(); // protocol version
 
             // Status
-            position.set("status", buf.getUnsignedByte(buf.readerIndex()) & 0x0f);
+            position.set(Event.KEY_STATUS, buf.getUnsignedByte(buf.readerIndex()) & 0x0f);
             
             int operator = (buf.readUnsignedByte() & 0xf0) << 4;
             operator += buf.readUnsignedByte();
@@ -130,7 +131,7 @@ public class CellocatorProtocolDecoder extends BaseProtocolDecoder {
             position.set("operator", operator);
             
             buf.readUnsignedInt(); // ADC
-            buf.readUnsignedMedium(); // milage
+            buf.readUnsignedMedium(); // Odometer
             buf.skipBytes(6); // multi-purpose data
             
             buf.readUnsignedShort(); // gps fix
diff --git a/src/org/traccar/protocol/EasyTrackProtocolDecoder.java b/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
index eed94843d..a3f75973e 100644
--- a/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/EasyTrackProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class EasyTrackProtocolDecoder extends BaseProtocolDecoder {
@@ -53,7 +54,7 @@ public class EasyTrackProtocolDecoder extends BaseProtocolDecoder {
             "(\\p{XDigit}+)," +                 // Signal
             "(\\d+)," +                         // Power
             "(\\p{XDigit}{4})," +               // Oil
-            "(\\p{XDigit}+),?" +                // Milage
+            "(\\p{XDigit}+),?" +                // Odometer
             "(\\d+)?" +                         // Altitude
             ".*");
 
@@ -112,19 +113,19 @@ public class EasyTrackProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Integer.parseInt(parser.group(index++), 16) / 100.0);
 
         // Status
-        position.set("status", parser.group(index++));
+        position.set(Event.KEY_STATUS, parser.group(index++));
 
         // Signal
         position.set("signal", parser.group(index++));
 
         // Power
-        position.set("power", Double.valueOf(parser.group(index++)));
+        position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
 
         // Oil
         position.set("oil", Integer.parseInt(parser.group(index++), 16));
 
-        // Milage
-        position.set("milage", Integer.parseInt(parser.group(index++), 16));
+        // Odometer
+        position.set(Event.KEY_ODOMETER, Integer.parseInt(parser.group(index++), 16));
         
         // Altitude
         String altitude = parser.group(index++);
diff --git a/src/org/traccar/protocol/EelinkProtocolDecoder.java b/src/org/traccar/protocol/EelinkProtocolDecoder.java
index 8f403d95f..bbcce5cfc 100644
--- a/src/org/traccar/protocol/EelinkProtocolDecoder.java
+++ b/src/org/traccar/protocol/EelinkProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class EelinkProtocolDecoder extends BaseProtocolDecoder {
@@ -96,7 +97,7 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
             position.setDeviceId(getDeviceId());
             
             position.setProtocol(getProtocol());
-            position.set("index", index);
+            position.set(Event.KEY_INDEX, index);
             
             // Location
             position.setTime(new Date(buf.readUnsignedInt() * 1000));
@@ -106,17 +107,17 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
             position.setCourse(buf.readUnsignedShort());
             
             // Cell
-            position.set("cell", ChannelBufferTools.readHexString(buf, 18));
+            position.set(Event.KEY_CELL, ChannelBufferTools.readHexString(buf, 18));
             
             // Validity
             position.setValid((buf.readUnsignedByte() & 0x01) != 0);
             
             if (type == MSG_ALARM) {
-                position.set("alarm", buf.readUnsignedByte());
+                position.set(Event.KEY_ALARM, buf.readUnsignedByte());
             }
             
             if (type == MSG_STATE) {
-                position.set("status", buf.readUnsignedByte());
+                position.set(Event.KEY_STATUS, buf.readUnsignedByte());
             }
             return position;
         }
@@ -134,7 +135,7 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
             // Create new position
             Position position = new Position();
             ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("gt02");
-            position.set("index", index);
+            position.set(Event.KEY_INDEX, index);
 
             // Get device id
             try {
diff --git a/src/org/traccar/protocol/EnforaProtocolDecoder.java b/src/org/traccar/protocol/EnforaProtocolDecoder.java
index 67ad1a691..1185c28ad 100644
--- a/src/org/traccar/protocol/EnforaProtocolDecoder.java
+++ b/src/org/traccar/protocol/EnforaProtocolDecoder.java
@@ -28,6 +28,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
 import org.traccar.helper.Log;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class EnforaProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/Ev603ProtocolDecoder.java b/src/org/traccar/protocol/Ev603ProtocolDecoder.java
index 49d70d433..5024ddcd1 100644
--- a/src/org/traccar/protocol/Ev603ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Ev603ProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;

 

 import org.traccar.BaseProtocolDecoder;

+import org.traccar.model.Event;

 import org.traccar.model.Position;

 

 public class Ev603ProtocolDecoder extends BaseProtocolDecoder{

diff --git a/src/org/traccar/protocol/FreedomProtocolDecoder.java b/src/org/traccar/protocol/FreedomProtocolDecoder.java
index c0e7ec7c6..e4cfe99af 100644
--- a/src/org/traccar/protocol/FreedomProtocolDecoder.java
+++ b/src/org/traccar/protocol/FreedomProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class FreedomProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/GalileoProtocolDecoder.java b/src/org/traccar/protocol/GalileoProtocolDecoder.java
index ffd859f45..c2c8864e9 100644
--- a/src/org/traccar/protocol/GalileoProtocolDecoder.java
+++ b/src/org/traccar/protocol/GalileoProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Log;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class GalileoProtocolDecoder extends BaseProtocolDecoder {
@@ -42,7 +43,7 @@ public class GalileoProtocolDecoder extends BaseProtocolDecoder {
     private static final int TAG_STATUS = 0x40;
     private static final int TAG_POWER = 0x41;
     private static final int TAG_BATTERY = 0x42;
-    private static final int TAG_MILAGE = 0xd4;
+    private static final int TAG_ODOMETER = 0xd4;
     private static final int TAG_REFRIGERATOR = 0x5b;
     private static final int TAG_PRESSURE = 0x5c;
     
@@ -135,19 +136,19 @@ public class GalileoProtocolDecoder extends BaseProtocolDecoder {
                     break;
                     
                 case TAG_STATUS:
-                    position.set("status", buf.readUnsignedShort());
+                    position.set(Event.KEY_STATUS, buf.readUnsignedShort());
                     break;
                     
                 case TAG_POWER:
-                    position.set("power", buf.readUnsignedShort());
+                    position.set(Event.KEY_POWER, buf.readUnsignedShort());
                     break;
                     
                 case TAG_BATTERY:
-                    position.set("battery", buf.readUnsignedShort());
+                    position.set(Event.KEY_BATTERY, buf.readUnsignedShort());
                     break;
                     
-                case TAG_MILAGE:
-                    position.set("milage", buf.readUnsignedInt());
+                case TAG_ODOMETER:
+                    position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
                     break;
                     
                 default:
diff --git a/src/org/traccar/protocol/GatorProtocolDecoder.java b/src/org/traccar/protocol/GatorProtocolDecoder.java
index d277b4b3d..4078fd64f 100644
--- a/src/org/traccar/protocol/GatorProtocolDecoder.java
+++ b/src/org/traccar/protocol/GatorProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class GatorProtocolDecoder extends BaseProtocolDecoder {
@@ -96,10 +97,10 @@ public class GatorProtocolDecoder extends BaseProtocolDecoder {
             // Flags
             int flags = buf.readUnsignedByte();
             position.setValid((flags & 0x80) != 0);
-            position.set("satellites", flags & 0x0f);
+            position.set(Event.KEY_SATELLITES, flags & 0x0f);
 
             // Status
-            position.set("status", buf.readUnsignedByte());
+            position.set(Event.KEY_STATUS, buf.readUnsignedByte());
 
             // Key switch
             position.set("key", buf.readUnsignedByte());
@@ -108,10 +109,10 @@ public class GatorProtocolDecoder extends BaseProtocolDecoder {
             position.set("oil", buf.readUnsignedShort() / 10.0);
 
             // Power
-            position.set("power", buf.readUnsignedByte() + buf.readUnsignedByte() / 100.0);
+            position.set(Event.KEY_POWER, buf.readUnsignedByte() + buf.readUnsignedByte() / 100.0);
 
-            // Milage
-            position.set("milage", buf.readUnsignedInt());
+            // Odometer
+            position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
             return position;
         }
 
diff --git a/src/org/traccar/protocol/Gl100ProtocolDecoder.java b/src/org/traccar/protocol/Gl100ProtocolDecoder.java
index 04be88121..a4545583b 100644
--- a/src/org/traccar/protocol/Gl100ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gl100ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Gl100ProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/Gl200ProtocolDecoder.java b/src/org/traccar/protocol/Gl200ProtocolDecoder.java
index dfff90e70..61282f521 100644
--- a/src/org/traccar/protocol/Gl200ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gl200ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Gl200ProtocolDecoder extends BaseProtocolDecoder {
@@ -50,7 +51,7 @@ public class Gl200ProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{4})?," +                      // MNC
             "(\\p{XDigit}{4})?," +              // LAC
             "(\\p{XDigit}{4})?," +              // Cell
-            "(?:(\\d+\\.\\d)?," +               // Milage
+            "(?:(\\d+\\.\\d)?," +               // Odometer
             "(\\d{1,3})?)?" +                   // Battery
             ".*");
 
@@ -118,17 +119,17 @@ public class Gl200ProtocolDecoder extends BaseProtocolDecoder {
         position.setTime(time.getTime());
 
         // Cell information
-        position.set("mcc", parser.group(index++));
-        position.set("mnc", parser.group(index++));
-        position.set("lac", parser.group(index++));
-        position.set("cell", parser.group(index++));
+        position.set(Event.KEY_MCC, parser.group(index++));
+        position.set(Event.KEY_MNC, parser.group(index++));
+        position.set(Event.KEY_LAC, parser.group(index++));
+        position.set(Event.KEY_CELL, parser.group(index++));
 
         // Other
-        String milage = parser.group(index++);
-        if (milage != null && Double.valueOf(milage) != 0) {
-            position.set("milage", milage);
+        String odometer = parser.group(index++);
+        if (odometer != null && Double.valueOf(odometer) != 0) {
+            position.set(Event.KEY_ODOMETER, odometer);
         }
-        position.set("battery", parser.group(index++));
+        position.set(Event.KEY_BATTERY, parser.group(index++));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/GlobalSatProtocolDecoder.java b/src/org/traccar/protocol/GlobalSatProtocolDecoder.java
index 05521c476..512ed9da8 100644
--- a/src/org/traccar/protocol/GlobalSatProtocolDecoder.java
+++ b/src/org/traccar/protocol/GlobalSatProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.Context;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class GlobalSatProtocolDecoder extends BaseProtocolDecoder {
@@ -167,7 +168,7 @@ public class GlobalSatProtocolDecoder extends BaseProtocolDecoder {
                     position.setCourse(Double.valueOf(value));
                     break;
                 case 'N':
-                    position.set("battery", value);
+                    position.set(Event.KEY_BATTERY, value);
                     break;
                 default:
                     // Unsupported
@@ -253,10 +254,10 @@ public class GlobalSatProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // Satellites
-        position.set("satellites", Integer.valueOf(parser.group(index++)));
+        position.set(Event.KEY_SATELLITES, Integer.valueOf(parser.group(index++)));
 
         // HDOP
-        position.set("hdop", parser.group(index++));
+        position.set(Event.KEY_HDOP, parser.group(index++));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/GoSafeProtocolDecoder.java b/src/org/traccar/protocol/GoSafeProtocolDecoder.java
index 477845090..a768ac589 100644
--- a/src/org/traccar/protocol/GoSafeProtocolDecoder.java
+++ b/src/org/traccar/protocol/GoSafeProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class GoSafeProtocolDecoder extends BaseProtocolDecoder {
@@ -104,7 +105,7 @@ public class GoSafeProtocolDecoder extends BaseProtocolDecoder {
         position.setSpeed(Double.valueOf(parser.group(index++)));
         position.setCourse(Double.valueOf(parser.group(index++)));
         position.setAltitude(Double.valueOf(parser.group(index++)));
-        position.set("hdop", parser.group(index++));
+        position.set(Event.KEY_HDOP, parser.group(index++));
 
         return position;
     }
diff --git a/src/org/traccar/protocol/GotopProtocolDecoder.java b/src/org/traccar/protocol/GotopProtocolDecoder.java
index 932a84f1b..baa54b09e 100644
--- a/src/org/traccar/protocol/GotopProtocolDecoder.java
+++ b/src/org/traccar/protocol/GotopProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class GotopProtocolDecoder extends BaseProtocolDecoder {
@@ -96,7 +97,7 @@ public class GotopProtocolDecoder extends BaseProtocolDecoder {
         position.setSpeed(Double.valueOf(parser.group(index++)) * 0.539957);
         
         // Status
-        position.set("status", parser.group(index++));
+        position.set(Event.KEY_STATUS, parser.group(index++));
 
         // Course
         String course = parser.group(index++);
diff --git a/src/org/traccar/protocol/Gps103ProtocolDecoder.java b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
index 3c0cc6726..f842441a5 100644
--- a/src/org/traccar/protocol/Gps103ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
@@ -101,7 +102,7 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
         position.setDeviceId(getDeviceId());
 
         // Alarm message
-        position.set("alarm", parser.group(index++));
+        position.set(Event.KEY_ALARM, parser.group(index++));
         
         // Date
         Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
diff --git a/src/org/traccar/protocol/GpsGateProtocolDecoder.java b/src/org/traccar/protocol/GpsGateProtocolDecoder.java
index 14f665d18..dbc1ac5a9 100644
--- a/src/org/traccar/protocol/GpsGateProtocolDecoder.java
+++ b/src/org/traccar/protocol/GpsGateProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Crc;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class GpsGateProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/Gt02ProtocolDecoder.java b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
index d5da01efb..3280be207 100644
--- a/src/org/traccar/protocol/Gt02ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt02ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
@@ -77,7 +78,7 @@ public class Gt02ProtocolDecoder extends BaseProtocolDecoder {
             // Create new position
             Position position = new Position();
             position.setProtocol(getProtocol());
-            position.set("index", index);
+            position.set(Event.KEY_INDEX, index);
 
             // Get device id
             if (!identify(imei)) {
diff --git a/src/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
index f2ccea794..c4670cc2c 100644
--- a/src/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -22,6 +22,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.Context;
 import org.traccar.helper.Crc;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.util.Calendar;
@@ -157,7 +158,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
 
             // GPS length and Satellites count
             int gpsLength = buf.readUnsignedByte();
-            position.set("satellites", gpsLength & 0xf);
+            position.set(Event.KEY_SATELLITES, gpsLength & 0xf);
             gpsLength >>= 4;
 
             // Latitude
@@ -194,16 +195,16 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                 }
 
                 // Cell information
-                position.set("mcc", buf.readUnsignedShort());
-                position.set("mnc", buf.readUnsignedByte());
-                position.set("lac", buf.readUnsignedShort());
-                position.set("cell", buf.readUnsignedShort() << 8 + buf.readUnsignedByte());
+                position.set(Event.KEY_MCC, buf.readUnsignedShort());
+                position.set(Event.KEY_MNC, buf.readUnsignedByte());
+                position.set(Event.KEY_LAC, buf.readUnsignedShort());
+                position.set(Event.KEY_CELL, buf.readUnsignedShort() << 8 + buf.readUnsignedByte());
                 buf.skipBytes(lbsLength - 9);
 
                 // Status
                 if (type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3) {
 
-                    position.set("alarm", true);
+                    position.set(Event.KEY_ALARM, true);
 
                     int flags = buf.readUnsignedByte();
 
@@ -211,10 +212,10 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                     // TODO parse other flags
 
                     // Voltage
-                    position.set("power", buf.readUnsignedByte());
+                    position.set(Event.KEY_POWER, buf.readUnsignedByte());
 
                     // GSM signal
-                    position.set("gsm", buf.readUnsignedByte());
+                    position.set(Event.KEY_GSM, buf.readUnsignedByte());
                 }
             }
 
@@ -223,7 +224,7 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
                 buf.skipBytes(buf.readableBytes() - 6);
             }
             int index = buf.readUnsignedShort();
-            position.set("index", index);
+            position.set(Event.KEY_INDEX, index);
             sendResponse(channel, type, index);
             return position;
         }
diff --git a/src/org/traccar/protocol/H02ProtocolDecoder.java b/src/org/traccar/protocol/H02ProtocolDecoder.java
index 3d1eadf14..30c0aaa60 100644
--- a/src/org/traccar/protocol/H02ProtocolDecoder.java
+++ b/src/org/traccar/protocol/H02ProtocolDecoder.java
@@ -27,6 +27,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class H02ProtocolDecoder extends BaseProtocolDecoder {
@@ -95,7 +96,7 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse((buf.readUnsignedByte() & 0x0f) * 100.0 + ChannelBufferTools.readHexInteger(buf, 2));
         
         // Status
-        position.set("status", ChannelBufferTools.readHexString(buf, 8));
+        position.set(Event.KEY_STATUS, ChannelBufferTools.readHexString(buf, 8));
         return position;
     }
 
@@ -174,7 +175,7 @@ public class H02ProtocolDecoder extends BaseProtocolDecoder {
         position.setTime(time.getTime());
         
         // Status
-        position.set("status", parser.group(index++));
+        position.set(Event.KEY_STATUS, parser.group(index++));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/HaicomProtocolDecoder.java b/src/org/traccar/protocol/HaicomProtocolDecoder.java
index b685a40c5..303f96793 100644
--- a/src/org/traccar/protocol/HaicomProtocolDecoder.java
+++ b/src/org/traccar/protocol/HaicomProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class HaicomProtocolDecoder extends BaseProtocolDecoder {
@@ -113,12 +114,12 @@ public class HaicomProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)) / 10);
         
         // Additional data
-        position.set("status", parser.group(index++));
+        position.set(Event.KEY_STATUS, parser.group(index++));
         position.set("gprs", parser.group(index++));
-        position.set("gps", parser.group(index++));
-        position.set("input", parser.group(index++));
-        position.set("output", parser.group(index++));
-        position.set("battery", Double.valueOf(parser.group(index++)) / 10);
+        position.set(Event.KEY_GPS, parser.group(index++));
+        position.set(Event.KEY_INPUT, parser.group(index++));
+        position.set(Event.KEY_OUTPUT, parser.group(index++));
+        position.set(Event.KEY_BATTERY, Double.valueOf(parser.group(index++)) / 10);
 
         return position;
     }
diff --git a/src/org/traccar/protocol/IntellitracProtocolDecoder.java b/src/org/traccar/protocol/IntellitracProtocolDecoder.java
index c621b07e7..e1fe91d49 100644
--- a/src/org/traccar/protocol/IntellitracProtocolDecoder.java
+++ b/src/org/traccar/protocol/IntellitracProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class IntellitracProtocolDecoder extends BaseProtocolDecoder {
@@ -57,7 +58,7 @@ public class IntellitracProtocolDecoder extends BaseProtocolDecoder {
             "(\\d+)," +                    // Charger Pressure
             "(\\d+)," +                    // TPL
             "(\\d+)," +                    // Axle Weight
-            "(\\d+))?" +                   // Milage
+            "(\\d+))?" +                   // Odometer
             ".*");
 
     @Override
@@ -105,16 +106,16 @@ public class IntellitracProtocolDecoder extends BaseProtocolDecoder {
         // Satellites
         int satellites = Integer.valueOf(parser.group(index++));
         position.setValid(satellites >= 3);
-        position.set("satellites", satellites);
+        position.set(Event.KEY_SATELLITES, satellites);
         
         // Report identifier
-        position.set("index", Long.valueOf(parser.group(index++)));
+        position.set(Event.KEY_INDEX, Long.valueOf(parser.group(index++)));
 
         // Input
-        position.set("input", parser.group(index++));
+        position.set(Event.KEY_INPUT, parser.group(index++));
 
         // Output
-        position.set("output", parser.group(index++));
+        position.set(Event.KEY_OUTPUT, parser.group(index++));
 
         // ADC1
         position.set("adc1", parser.group(index++));
@@ -126,13 +127,13 @@ public class IntellitracProtocolDecoder extends BaseProtocolDecoder {
         position.set("vss", parser.group(index++));
         position.set("rpm", parser.group(index++));
         position.set("coolant", parser.group(index++));
-        position.set("fuel", parser.group(index++));
+        position.set(Event.KEY_FUEL, parser.group(index++));
         position.set("consumption", parser.group(index++));
-        position.set("temperature", parser.group(index++));
+        position.set(Event.KEY_TEMPERATURE, parser.group(index++));
         position.set("charger", parser.group(index++));
         position.set("tpl", parser.group(index++));
         position.set("axle", parser.group(index++));
-        position.set("milage", parser.group(index++));
+        position.set(Event.KEY_ODOMETER, parser.group(index++));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/Jt600ProtocolDecoder.java b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
index 54110b101..52b84296d 100644
--- a/src/org/traccar/protocol/Jt600ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
@@ -27,6 +27,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
@@ -92,29 +93,29 @@ public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
         
         if (version == 1) {
             
-            position.set("satellites", buf.readUnsignedByte());
+            position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
 
             // Power
-            position.set("power", buf.readUnsignedByte());
+            position.set(Event.KEY_POWER, buf.readUnsignedByte());
 
             buf.readByte(); // other flags and sensors
 
             // Altitude
             position.setAltitude(buf.readUnsignedShort());
 
-            position.set("cell", buf.readUnsignedShort());
-            position.set("lac", buf.readUnsignedShort());
-            position.set("gsm", buf.readUnsignedByte());
+            position.set(Event.KEY_CELL, buf.readUnsignedShort());
+            position.set(Event.KEY_LAC, buf.readUnsignedShort());
+            position.set(Event.KEY_GSM, buf.readUnsignedByte());
 
         } else if (version == 2) {
 
             int fuel = buf.readUnsignedByte() << 8;
 
-            position.set("status", buf.readUnsignedInt());
-            position.set("milage", buf.readUnsignedInt());
+            position.set(Event.KEY_STATUS, buf.readUnsignedInt());
+            position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
 
             fuel += buf.readUnsignedByte();
-            position.set("fuel", fuel);
+            position.set(Event.KEY_FUEL, fuel);
 
         }
         return position;
@@ -194,7 +195,7 @@ public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // Power
-        position.set("power", Double.valueOf(parser.group(index++)));
+        position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/KhdProtocolDecoder.java b/src/org/traccar/protocol/KhdProtocolDecoder.java
index cb2cf161a..bf1f5deea 100644
--- a/src/org/traccar/protocol/KhdProtocolDecoder.java
+++ b/src/org/traccar/protocol/KhdProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
 import org.traccar.helper.Crc;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class KhdProtocolDecoder extends BaseProtocolDecoder {
@@ -107,8 +108,8 @@ public class KhdProtocolDecoder extends BaseProtocolDecoder {
 
             } else {
 
-                // Milage
-                position.set("milage", buf.readUnsignedMedium());
+                // Odometer
+                position.set(Event.KEY_ODOMETER, buf.readUnsignedMedium());
             
                 // Status
                 buf.skipBytes(4);
diff --git a/src/org/traccar/protocol/LaipacProtocolDecoder.java b/src/org/traccar/protocol/LaipacProtocolDecoder.java
index efc6b0514..af43df511 100644
--- a/src/org/traccar/protocol/LaipacProtocolDecoder.java
+++ b/src/org/traccar/protocol/LaipacProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Crc;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class LaipacProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/M2mProtocolDecoder.java b/src/org/traccar/protocol/M2mProtocolDecoder.java
index 026a067b4..c335a2d41 100644
--- a/src/org/traccar/protocol/M2mProtocolDecoder.java
+++ b/src/org/traccar/protocol/M2mProtocolDecoder.java
@@ -23,6 +23,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class M2mProtocolDecoder extends BaseProtocolDecoder {
@@ -116,7 +117,7 @@ public class M2mProtocolDecoder extends BaseProtocolDecoder {
             if (satellites == 0) {
                 return null; // cell information
             }
-            position.set("satellites", satellites);
+            position.set(Event.KEY_SATELLITES, satellites);
             position.setValid(true);
 
             // TODO decode everything else
diff --git a/src/org/traccar/protocol/ManPowerProtocolDecoder.java b/src/org/traccar/protocol/ManPowerProtocolDecoder.java
index 840a1a032..773e2d782 100644
--- a/src/org/traccar/protocol/ManPowerProtocolDecoder.java
+++ b/src/org/traccar/protocol/ManPowerProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class ManPowerProtocolDecoder extends BaseProtocolDecoder {
@@ -74,7 +75,7 @@ public class ManPowerProtocolDecoder extends BaseProtocolDecoder {
         position.setDeviceId(getDeviceId());
 
         // Alarm message
-        position.set("status", parser.group(index++));
+        position.set(Event.KEY_STATUS, parser.group(index++));
         
         // Date
         Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
diff --git a/src/org/traccar/protocol/MaxonProtocolDecoder.java b/src/org/traccar/protocol/MaxonProtocolDecoder.java
index 39a841a1f..c25a190f1 100644
--- a/src/org/traccar/protocol/MaxonProtocolDecoder.java
+++ b/src/org/traccar/protocol/MaxonProtocolDecoder.java
@@ -27,6 +27,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.database.DataManager;
 import org.traccar.helper.Log;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 /**
diff --git a/src/org/traccar/protocol/MegastekProtocolDecoder.java b/src/org/traccar/protocol/MegastekProtocolDecoder.java
index 77b1fb5ca..84bd33be8 100644
--- a/src/org/traccar/protocol/MegastekProtocolDecoder.java
+++ b/src/org/traccar/protocol/MegastekProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class MegastekProtocolDecoder extends BaseProtocolDecoder {
@@ -188,7 +189,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             int index = 1;
 
             // Alarm
-            position.set("alarm", parser.group(index++));
+            position.set(Event.KEY_ALARM, parser.group(index++));
 
             // IMEI
             if (!identify(parser.group(index++), false)) {
@@ -199,7 +200,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             position.setDeviceId(getDeviceId());
 
             // Satellites
-            position.set("satellites", parser.group(index++));
+            position.set(Event.KEY_SATELLITES, parser.group(index++));
 
             // Altitude
             String altitude = parser.group(index++);
@@ -208,7 +209,7 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             }
 
             // Battery
-            position.set("power", Double.valueOf(parser.group(index++)));
+            position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
 
             // Charger
             String charger = parser.group(index++);
@@ -216,9 +217,9 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
                 position.set("charger", Integer.valueOf(charger) == 1);
             }
 
-            position.set("mcc", parser.group(index++));
-            position.set("mnc", parser.group(index++));
-            position.set("lac", parser.group(index++));
+            position.set(Event.KEY_MCC, parser.group(index++));
+            position.set(Event.KEY_MNC, parser.group(index++));
+            position.set(Event.KEY_LAC, parser.group(index++));
             
         } else {
 
@@ -235,21 +236,21 @@ public class MegastekProtocolDecoder extends BaseProtocolDecoder {
             }
             position.setDeviceId(getDeviceId());
 
-            position.set("mcc", parser.group(index++));
-            position.set("mnc", parser.group(index++));
-            position.set("lac", parser.group(index++));
-            position.set("gsm", parser.group(index++));
+            position.set(Event.KEY_MCC, parser.group(index++));
+            position.set(Event.KEY_MNC, parser.group(index++));
+            position.set(Event.KEY_LAC, parser.group(index++));
+            position.set(Event.KEY_GSM, parser.group(index++));
 
             // Battery
-            position.set("battery", Double.valueOf(parser.group(index++)));
+            position.set(Event.KEY_BATTERY, Double.valueOf(parser.group(index++)));
             
             position.set("flags", parser.group(index++));
-            position.set("input", parser.group(index++));
-            position.set("output", parser.group(index++));
+            position.set(Event.KEY_INPUT, parser.group(index++));
+            position.set(Event.KEY_OUTPUT, parser.group(index++));
             position.set("adc1", parser.group(index++));
             position.set("adc2", parser.group(index++));
             position.set("adc3", parser.group(index++));
-            position.set("alarm", parser.group(index++));
+            position.set(Event.KEY_ALARM, parser.group(index++));
             
         }
         return position;
diff --git a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
index d35a75885..c58538445 100644
--- a/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
+++ b/src/org/traccar/protocol/MeiligaoProtocolDecoder.java
@@ -31,6 +31,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.Context;
 import org.traccar.helper.Crc;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
@@ -58,7 +59,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
             ",([0-9a-fA-F]+),([0-9a-fA-F]+))?" +
             "(?:\\|([0-9a-fA-F]+))?" +          // Cell
             "(?:\\|([0-9a-fA-F]+))?" +          // Signal
-            "(?:\\|([0-9a-fA-F]+))?" +          // Milage
+            "(?:\\|([0-9a-fA-F]+))?" +          // Odometer
             ".*");
     
     private static final int MSG_HEARTBEAT = 0x0001;
@@ -171,7 +172,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
 
         // Custom data
         if (command == MSG_ALARM) {
-            position.set("alarm", buf.readUnsignedByte());
+            position.set(Event.KEY_ALARM, buf.readUnsignedByte());
         } else if (command == MSG_POSITION_LOGGED) {
             buf.skipBytes(6);
         }
@@ -237,7 +238,7 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
         position.setTime(time.getTime());
 
         // Dilution of precision
-        position.set("hdop", parser.group(index++));
+        position.set(Event.KEY_HDOP, parser.group(index++));
 
         // Altitude
         String altitude = parser.group(index++);
@@ -262,19 +263,19 @@ public class MeiligaoProtocolDecoder extends BaseProtocolDecoder {
         // Cell identifier
         String cell = parser.group(index++);
         if (cell != null) {
-            position.set("cell", cell);
+            position.set(Event.KEY_CELL, cell);
         }
 
         // GSM signal
         String gsm = parser.group(index++);
         if (gsm != null) {
-            position.set("gsm", Integer.parseInt(gsm, 16));
+            position.set(Event.KEY_GSM, Integer.parseInt(gsm, 16));
         }
 
-        // Milage
-        String milage = parser.group(index++);
-        if (milage != null) {
-            position.set("milage", Integer.parseInt(milage, 16));
+        // Odometer
+        String odometer = parser.group(index++);
+        if (odometer != null) {
+            position.set(Event.KEY_ODOMETER, Integer.parseInt(odometer, 16));
         }
 
         return position;
diff --git a/src/org/traccar/protocol/MeitrackProtocolDecoder.java b/src/org/traccar/protocol/MeitrackProtocolDecoder.java
index d96afba01..8828bfd23 100644
--- a/src/org/traccar/protocol/MeitrackProtocolDecoder.java
+++ b/src/org/traccar/protocol/MeitrackProtocolDecoder.java
@@ -30,6 +30,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
@@ -56,7 +57,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             "(\\d+)," +                         // Course
             "(\\d+\\.?\\d*)," +                 // HDOP
             "(-?\\d+)," +                       // Altitude
-            "(\\d+)," +                         // Milage
+            "(\\d+)," +                         // Odometer
             "(\\d+)," +                         // Runtime
             "(\\d+\\|\\d+\\|\\p{XDigit}+\\|\\p{XDigit}+)," + // Cell
             "(\\p{XDigit}+)," +                 // State
@@ -94,7 +95,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
 
         // Event
         int event = Integer.valueOf(parser.group(index++));
-        position.set("event", event);
+        position.set(Event.KEY_EVENT, event);
 
         // Coordinates
         position.setLatitude(Double.valueOf(parser.group(index++)));
@@ -115,10 +116,10 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         position.setValid(parser.group(index++).compareTo("A") == 0);
 
         // Satellites
-        position.set("satellites", parser.group(index++));
+        position.set(Event.KEY_SATELLITES, parser.group(index++));
 
         // GSM Signal
-        position.set("gsm", parser.group(index++));
+        position.set(Event.KEY_GSM, parser.group(index++));
 
         // Speed
         position.setSpeed(Double.valueOf(parser.group(index++)) * 0.539957);
@@ -127,15 +128,15 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // HDOP
-        position.set("hdop", parser.group(index++));
+        position.set(Event.KEY_HDOP, parser.group(index++));
 
         // Altitude
         position.setAltitude(Double.valueOf(parser.group(index++)));
 
         // Other
-        position.set("milage", parser.group(index++));
+        position.set(Event.KEY_ODOMETER, parser.group(index++));
         position.set("runtime", parser.group(index++));
-        position.set("cell", parser.group(index++));
+        position.set(Event.KEY_CELL, parser.group(index++));
         position.set("state", parser.group(index++));
         
         // ADC
@@ -151,8 +152,8 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         if (adc3 != null) {
             position.set("adc3", Integer.parseInt(adc3, 16));
         }
-        position.set("battery", Integer.parseInt(parser.group(index++), 16));
-        position.set("power", Integer.parseInt(parser.group(index++), 16));
+        position.set(Event.KEY_BATTERY, Integer.parseInt(parser.group(index++), 16));
+        position.set(Event.KEY_POWER, Integer.parseInt(parser.group(index++), 16));
 
         // Event specific
         String data = parser.group(index++);
@@ -167,7 +168,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         // Fuel
         String fuel = parser.group(index++);
         if (fuel != null) {
-            position.set("fuel",
+            position.set(Event.KEY_FUEL,
                     Integer.parseInt(fuel.substring(0, 2), 16) + Integer.parseInt(fuel.substring(2), 16) * 0.01);
         }
 
@@ -195,7 +196,7 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             position.setDeviceId(getDeviceId());
             
             // Event
-            position.set("event", buf.readUnsignedByte());
+            position.set(Event.KEY_EVENT, buf.readUnsignedByte());
             
             // Location
             position.setLatitude(buf.readInt() * 0.000001);
@@ -208,10 +209,10 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             position.setValid(buf.readUnsignedByte() == 1);
 
             // Satellites
-            position.set("satellites", buf.readUnsignedByte());
+            position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
             
             // GSM Signal
-            position.set("gsm", buf.readUnsignedByte());
+            position.set(Event.KEY_GSM, buf.readUnsignedByte());
 
             // Speed
             position.setSpeed(buf.readUnsignedShort() * 0.539957);
@@ -220,23 +221,23 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
             position.setCourse(buf.readUnsignedShort());
 
             // HDOP
-            position.set("hdop", buf.readUnsignedShort() * 0.1);
+            position.set(Event.KEY_HDOP, buf.readUnsignedShort() * 0.1);
 
             // Altitude
             position.setAltitude(buf.readUnsignedShort());
 
             // Other
-            position.set("milage", buf.readUnsignedInt());
+            position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
             position.set("runtime", buf.readUnsignedInt());
-            position.set("cell",
+            position.set(Event.KEY_CELL,
                     buf.readUnsignedShort() + "|" + buf.readUnsignedShort() + "|" +
                     buf.readUnsignedShort() + "|" + buf.readUnsignedShort());
             position.set("state", buf.readUnsignedShort());
         
             // ADC
             position.set("adc1", buf.readUnsignedShort());
-            position.set("battery", buf.readUnsignedShort() * 0.01);
-            position.set("power", buf.readUnsignedShort());
+            position.set(Event.KEY_BATTERY, buf.readUnsignedShort() * 0.01);
+            position.set(Event.KEY_POWER, buf.readUnsignedShort());
             
             buf.readUnsignedInt(); // geo-fence
             positions.add(position);
diff --git a/src/org/traccar/protocol/MiniFinderProtocolDecoder.java b/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
index 09e8dcafe..036650657 100644
--- a/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
+++ b/src/org/traccar/protocol/MiniFinderProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class MiniFinderProtocolDecoder extends BaseProtocolDecoder {
@@ -101,10 +102,10 @@ public class MiniFinderProtocolDecoder extends BaseProtocolDecoder {
             position.setAltitude(Double.valueOf(parser.group(index++)));
 
             // Battery
-            position.set("battery", parser.group(index++));
+            position.set(Event.KEY_BATTERY, parser.group(index++));
 
             // Satellites
-            position.set("satellites", parser.group(index++));
+            position.set(Event.KEY_SATELLITES, parser.group(index++));
             return position;
         }
 
diff --git a/src/org/traccar/protocol/Mta6ProtocolDecoder.java b/src/org/traccar/protocol/Mta6ProtocolDecoder.java
index 69b3ee673..c5bf2827b 100644
--- a/src/org/traccar/protocol/Mta6ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Mta6ProtocolDecoder.java
@@ -34,6 +34,7 @@ import org.jboss.netty.handler.codec.http.HttpVersion;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Mta6ProtocolDecoder extends BaseProtocolDecoder {
@@ -162,7 +163,7 @@ public class Mta6ProtocolDecoder extends BaseProtocolDecoder {
                 }
 
                 if (checkBit(flags, 3)) {
-                    position.set("milage", buf.readUnsignedShort());
+                    position.set(Event.KEY_ODOMETER, buf.readUnsignedShort());
                 }
 
                 if (checkBit(flags, 4)) {
@@ -180,22 +181,22 @@ public class Mta6ProtocolDecoder extends BaseProtocolDecoder {
                 }
 
                 if (checkBit(flags, 6)) {
-                    position.set("temperature", buf.readByte());
+                    position.set(Event.KEY_TEMPERATURE, buf.readByte());
                     buf.getUnsignedByte(buf.readerIndex()); // control (>> 4)
                     position.set("sensor", buf.readUnsignedShort() & 0x0fff);
                     buf.readUnsignedShort(); // old sensor state (& 0x0fff)
                 }
 
                 if (checkBit(flags, 7)) {
-                    position.set("battery", buf.getUnsignedByte(buf.readerIndex()) >> 2);
-                    position.set("power", buf.readUnsignedShort() & 0x03ff);
+                    position.set(Event.KEY_BATTERY, buf.getUnsignedByte(buf.readerIndex()) >> 2);
+                    position.set(Event.KEY_POWER, buf.readUnsignedShort() & 0x03ff);
                     buf.readByte(); // microcontroller temperature
 
-                    position.set("gsm", (buf.getUnsignedByte(buf.readerIndex()) >> 4) & 0x07);
+                    position.set(Event.KEY_GSM, (buf.getUnsignedByte(buf.readerIndex()) >> 4) & 0x07);
 
                     int satellites = buf.readUnsignedByte() & 0x0f;
                     position.setValid(satellites >= 3);
-                    position.set("satellites", satellites);
+                    position.set(Event.KEY_SATELLITES, satellites);
                 }
                 positions.add(position);
             }
@@ -234,7 +235,7 @@ public class Mta6ProtocolDecoder extends BaseProtocolDecoder {
             position.setAltitude(buf.readUnsignedShort());
             position.setSpeed(buf.readUnsignedByte());
             position.setCourse(buf.readByte());
-            position.set("milage", new FloatReader().readFloat(buf));
+            position.set(Event.KEY_ODOMETER, new FloatReader().readFloat(buf));
         }
 
         if (checkBit(flags, 1)) {
@@ -246,34 +247,34 @@ public class Mta6ProtocolDecoder extends BaseProtocolDecoder {
         if (checkBit(flags, 2)) {
             position.set("engine", buf.readUnsignedShort() * 0.125);
             position.set("pedals", buf.readUnsignedByte());
-            position.set("temperature", buf.readUnsignedByte() - 40);
-            buf.readUnsignedShort(); // service milage
+            position.set(Event.KEY_TEMPERATURE, buf.readUnsignedByte() - 40);
+            buf.readUnsignedShort(); // service odometer
         }
 
         if (checkBit(flags, 3)) {
-            position.set("fuel", buf.readUnsignedShort());
+            position.set(Event.KEY_FUEL, buf.readUnsignedShort());
             position.set("adc2", buf.readUnsignedShort());
             position.set("adc3", buf.readUnsignedShort());
             position.set("adc4", buf.readUnsignedShort());
         }
 
         if (checkBit(flags, 4)) {
-            position.set("temperature", buf.readByte());
+            position.set(Event.KEY_TEMPERATURE, buf.readByte());
             buf.getUnsignedByte(buf.readerIndex()); // control (>> 4)
             position.set("sensor", buf.readUnsignedShort() & 0x0fff);
             buf.readUnsignedShort(); // old sensor state (& 0x0fff)
         }
 
         if (checkBit(flags, 5)) {
-            position.set("battery", buf.getUnsignedByte(buf.readerIndex()) >> 2);
-            position.set("power", buf.readUnsignedShort() & 0x03ff);
+            position.set(Event.KEY_BATTERY, buf.getUnsignedByte(buf.readerIndex()) >> 2);
+            position.set(Event.KEY_POWER, buf.readUnsignedShort() & 0x03ff);
             buf.readByte(); // microcontroller temperature
 
-            position.set("gsm", buf.getUnsignedByte(buf.readerIndex()) >> 5);
+            position.set(Event.KEY_GSM, buf.getUnsignedByte(buf.readerIndex()) >> 5);
 
             int satellites = buf.readUnsignedByte() & 0x1f;
             position.setValid(satellites >= 3);
-            position.set("satellites", satellites);
+            position.set(Event.KEY_SATELLITES, satellites);
         }
         
         // TODO: process other data
diff --git a/src/org/traccar/protocol/MtxProtocolDecoder.java b/src/org/traccar/protocol/MtxProtocolDecoder.java
index 809b26c25..1d32e83f6 100644
--- a/src/org/traccar/protocol/MtxProtocolDecoder.java
+++ b/src/org/traccar/protocol/MtxProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class MtxProtocolDecoder extends BaseProtocolDecoder {
@@ -41,7 +42,7 @@ public class MtxProtocolDecoder extends BaseProtocolDecoder {
             "(-?\\d+\\.\\d+)," +                // Longitude
             "(\\d+\\.?\\d*)," +                 // Speed
             "(\\d+)," +                         // Course
-            "(\\d+\\.?\\d*)," +                 // Milage
+            "(\\d+\\.?\\d*)," +                 // Odometer
             "(?:\\d+|X)," +
             "(?:[01]|X)," +
             "([01]+)," +                        // Input
@@ -99,9 +100,9 @@ public class MtxProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // Other
-        position.set("milage", Double.valueOf(parser.group(index++)));
-        position.set("input", parser.group(index++));
-        position.set("output", parser.group(index++));
+        position.set(Event.KEY_ODOMETER, Double.valueOf(parser.group(index++)));
+        position.set(Event.KEY_INPUT, parser.group(index++));
+        position.set(Event.KEY_OUTPUT, parser.group(index++));
         position.set("adc1", parser.group(index++));
         position.set("adc2", parser.group(index++));
 
diff --git a/src/org/traccar/protocol/NavigilProtocolDecoder.java b/src/org/traccar/protocol/NavigilProtocolDecoder.java
index 76859aa05..a51acf3fe 100644
--- a/src/org/traccar/protocol/NavigilProtocolDecoder.java
+++ b/src/org/traccar/protocol/NavigilProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Crc;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class NavigilProtocolDecoder extends BaseProtocolDecoder {
@@ -82,7 +83,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         position.setProtocol(getProtocol());
 
         position.setValid(true);
-        position.set("index", sequenceNumber);
+        position.set(Event.KEY_INDEX, sequenceNumber);
         position.setDeviceId(getDeviceId());
         
         buf.readUnsignedShort(); // report trigger
@@ -102,7 +103,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         buf.readUnsignedInt(); // distance
         buf.readUnsignedInt(); // delta distance
 
-        position.set("battery", buf.readUnsignedShort() * 0.001);
+        position.set(Event.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
         
         buf.readUnsignedShort(); // battery charger status
         
@@ -117,7 +118,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         position.setProtocol(getProtocol());
 
         position.setValid(true);
-        position.set("index", sequenceNumber);
+        position.set(Event.KEY_INDEX, sequenceNumber);
         position.setDeviceId(getDeviceId());
         
         buf.readUnsignedShort(); // report trigger
@@ -143,7 +144,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         buf.readUnsignedShort(); // VSAUT1 voltage
         buf.readUnsignedShort(); // VSAUT2 voltage
         buf.readUnsignedShort(); // solar voltage
-        position.set("battery", buf.readUnsignedShort() * 0.001);
+        position.set(Event.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
         
         // TODO: a lot of other stuff
         return position;
@@ -153,7 +154,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         Position position = new Position();
         position.setProtocol(getProtocol());
 
-        position.set("index", sequenceNumber);
+        position.set(Event.KEY_INDEX, sequenceNumber);
         position.setDeviceId(getDeviceId());
         position.setTime(convertTimestamp(timestamp));
         
@@ -174,7 +175,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         Position position = new Position();
         position.setProtocol(getProtocol());
 
-        position.set("index", sequenceNumber);
+        position.set(Event.KEY_INDEX, sequenceNumber);
         position.setDeviceId(getDeviceId());
         position.setTime(convertTimestamp(timestamp));
         
@@ -197,7 +198,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         Position position = new Position();
         position.setProtocol(getProtocol());
 
-        position.set("index", sequenceNumber);
+        position.set(Event.KEY_INDEX, sequenceNumber);
         position.setDeviceId(getDeviceId());
 
         buf.readUnsignedByte(); // report trigger
@@ -226,7 +227,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
 
         buf.readUnsignedByte(); // supply voltage 1
         buf.readUnsignedByte(); // supply voltage 2
-        position.set("battery", buf.readUnsignedShort() * 0.001);
+        position.set(Event.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
 
         // TODO: a lot of other stuff
         return position;
@@ -236,7 +237,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
         Position position = new Position();
         position.setProtocol(getProtocol());
 
-        position.set("index", sequenceNumber);
+        position.set(Event.KEY_INDEX, sequenceNumber);
         position.setDeviceId(getDeviceId());
         position.setTime(convertTimestamp(timestamp));
 
@@ -255,7 +256,7 @@ public class NavigilProtocolDecoder extends BaseProtocolDecoder {
 
         buf.readUnsignedByte(); // satellites in fix
         
-        position.set("battery", buf.readUnsignedShort() * 0.001);
+        position.set(Event.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
         
         buf.readUnsignedInt(); // distance
         return position;
diff --git a/src/org/traccar/protocol/NavisProtocolDecoder.java b/src/org/traccar/protocol/NavisProtocolDecoder.java
index 1407a16db..8b142ce2e 100644
--- a/src/org/traccar/protocol/NavisProtocolDecoder.java
+++ b/src/org/traccar/protocol/NavisProtocolDecoder.java
@@ -28,6 +28,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class NavisProtocolDecoder extends BaseProtocolDecoder {
@@ -93,10 +94,10 @@ public class NavisProtocolDecoder extends BaseProtocolDecoder {
         position.set("format", format);
 
         long index = buf.readUnsignedInt();
-        position.set("index", index);
+        position.set(Event.KEY_INDEX, index);
 
         // Event type
-        position.set("event", buf.readUnsignedShort());
+        position.set(Event.KEY_EVENT, buf.readUnsignedShort());
 
         // Event time
         Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
@@ -110,36 +111,36 @@ public class NavisProtocolDecoder extends BaseProtocolDecoder {
         position.set("time", time.getTimeInMillis());
 
         // Alarm status
-        position.set("alarm", buf.readUnsignedByte());
+        position.set(Event.KEY_ALARM, buf.readUnsignedByte());
 
         // Modules status
-        position.set("status", buf.readUnsignedByte());
+        position.set(Event.KEY_STATUS, buf.readUnsignedByte());
 
         // GSM signal
-        position.set("gsm", buf.readUnsignedByte());
+        position.set(Event.KEY_GSM, buf.readUnsignedByte());
 
         // Output
         if (isFormat(format, F10, F20, F30)) {
-            position.set("output", buf.readUnsignedShort());
+            position.set(Event.KEY_OUTPUT, buf.readUnsignedShort());
         } else if (isFormat(format, F40, F50, F51, F52)) {
-            position.set("output", buf.readUnsignedByte());
+            position.set(Event.KEY_OUTPUT, buf.readUnsignedByte());
         }
 
         // Input
         if (isFormat(format, F10, F20, F30, F40)) {
-            position.set("input", buf.readUnsignedShort());
+            position.set(Event.KEY_INPUT, buf.readUnsignedShort());
         } else if (isFormat(format, F50, F51, F52)) {
-            position.set("input", buf.readUnsignedByte());
+            position.set(Event.KEY_INPUT, buf.readUnsignedByte());
         }
 
-        position.set("power", buf.readUnsignedShort() / 1000.0);
+        position.set(Event.KEY_POWER, buf.readUnsignedShort() / 1000.0);
 
         // Battery power
-        position.set("battery", buf.readUnsignedShort());
+        position.set(Event.KEY_BATTERY, buf.readUnsignedShort());
 
         // Temperature
         if (isFormat(format, F10, F20, F30)) {
-            position.set("temperature", buf.readShort());
+            position.set(Event.KEY_TEMPERATURE, buf.readShort());
         }
 
         if (isFormat(format, F10, F20, F50, F52)) {
@@ -174,8 +175,8 @@ public class NavisProtocolDecoder extends BaseProtocolDecoder {
             position.setSpeed(buf.readFloat());
             position.setCourse(buf.readUnsignedShort());
 
-            // Milage
-            position.set("milage", buf.readFloat());
+            // Odometer
+            position.set(Event.KEY_ODOMETER, buf.readFloat());
 
             // Last segment
             position.set("segment", buf.readFloat());
diff --git a/src/org/traccar/protocol/NoranProtocolDecoder.java b/src/org/traccar/protocol/NoranProtocolDecoder.java
index a93f16872..e43f47999 100644
--- a/src/org/traccar/protocol/NoranProtocolDecoder.java
+++ b/src/org/traccar/protocol/NoranProtocolDecoder.java
@@ -27,6 +27,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class NoranProtocolDecoder extends BaseProtocolDecoder {
@@ -84,7 +85,7 @@ public class NoranProtocolDecoder extends BaseProtocolDecoder {
             position.setValid((flags & 0x01) != 0);
 
             // Alarm type
-            position.set("alarm", buf.readUnsignedByte());
+            position.set(Event.KEY_ALARM, buf.readUnsignedByte());
 
             // Location
             position.setSpeed(buf.readUnsignedByte());
@@ -115,7 +116,7 @@ public class NoranProtocolDecoder extends BaseProtocolDecoder {
             position.set("io", buf.readUnsignedByte());
             
             // Fuel
-            position.set("fuel", buf.readUnsignedByte());
+            position.set(Event.KEY_FUEL, buf.readUnsignedByte());
             return position;
         }
 
diff --git a/src/org/traccar/protocol/OrionProtocolDecoder.java b/src/org/traccar/protocol/OrionProtocolDecoder.java
index 3c533664b..0361d2234 100644
--- a/src/org/traccar/protocol/OrionProtocolDecoder.java
+++ b/src/org/traccar/protocol/OrionProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class OrionProtocolDecoder extends BaseProtocolDecoder {
@@ -84,7 +85,7 @@ public class OrionProtocolDecoder extends BaseProtocolDecoder {
                 position.setDeviceId(getDeviceId());
                 position.setProtocol(getProtocol());
                 
-                position.set("event", buf.readUnsignedByte());
+                position.set(Event.KEY_EVENT, buf.readUnsignedByte());
                 buf.readUnsignedByte(); // length
                 position.set("flag1", buf.readUnsignedByte());
                 position.set("flag2", buf.readUnsignedByte());
@@ -109,7 +110,7 @@ public class OrionProtocolDecoder extends BaseProtocolDecoder {
                 
                 // Accuracy
                 int satellites = buf.readUnsignedByte();
-                position.set("satellites", satellites);
+                position.set(Event.KEY_SATELLITES, satellites);
                 position.setValid(satellites >= 3);
                 positions.add(position);
             }
diff --git a/src/org/traccar/protocol/OsmAndProtocolDecoder.java b/src/org/traccar/protocol/OsmAndProtocolDecoder.java
index e6b5476b1..6fb858d70 100644
--- a/src/org/traccar/protocol/OsmAndProtocolDecoder.java
+++ b/src/org/traccar/protocol/OsmAndProtocolDecoder.java
@@ -33,6 +33,7 @@ import org.jboss.netty.handler.codec.http.HttpVersion;
 import org.jboss.netty.handler.codec.http.QueryStringDecoder;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class OsmAndProtocolDecoder extends BaseProtocolDecoder {
@@ -97,7 +98,7 @@ public class OsmAndProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if (params.containsKey("hdop")) {
-            position.set("hdop", params.get("hdop").get(0));
+            position.set(Event.KEY_HDOP, params.get("hdop").get(0));
         }
 
         if (params.containsKey("vacc")) {
@@ -109,7 +110,7 @@ public class OsmAndProtocolDecoder extends BaseProtocolDecoder {
         }
 
         if (params.containsKey("batt")) {
-            position.set("battery", params.get("batt").get(0));
+            position.set(Event.KEY_BATTERY, params.get("batt").get(0));
         }
 
         if (params.containsKey("desc")) {
diff --git a/src/org/traccar/protocol/PiligrimProtocolDecoder.java b/src/org/traccar/protocol/PiligrimProtocolDecoder.java
index f4eafd833..30b81f5fb 100644
--- a/src/org/traccar/protocol/PiligrimProtocolDecoder.java
+++ b/src/org/traccar/protocol/PiligrimProtocolDecoder.java
@@ -34,6 +34,7 @@ import org.jboss.netty.handler.codec.http.HttpVersion;
 import org.jboss.netty.handler.codec.http.QueryStringDecoder;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class PiligrimProtocolDecoder extends BaseProtocolDecoder {
@@ -133,7 +134,7 @@ public class PiligrimProtocolDecoder extends BaseProtocolDecoder {
                     
                     // Satellites
                     int satellites = buf.readUnsignedByte();
-                    position.set("satellites", satellites);
+                    position.set(Event.KEY_SATELLITES, satellites);
                     position.setValid(satellites >= 3);
                     
                     // Speed
@@ -151,12 +152,12 @@ public class PiligrimProtocolDecoder extends BaseProtocolDecoder {
                         // External power
                         double power = buf.readUnsignedByte();
                         power += buf.readUnsignedByte() << 8;
-                        position.set("power", power / 100);
+                        position.set(Event.KEY_POWER, power / 100);
 
                         // Battery
                         double battery = buf.readUnsignedByte();
                         battery += buf.readUnsignedByte() << 8;
-                        position.set("battery", battery / 100);
+                        position.set(Event.KEY_BATTERY, battery / 100);
                         
                         buf.skipBytes(6);
                         
diff --git a/src/org/traccar/protocol/ProgressProtocolDecoder.java b/src/org/traccar/protocol/ProgressProtocolDecoder.java
index f07498d1e..a4231448f 100644
--- a/src/org/traccar/protocol/ProgressProtocolDecoder.java
+++ b/src/org/traccar/protocol/ProgressProtocolDecoder.java
@@ -28,6 +28,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class ProgressProtocolDecoder extends BaseProtocolDecoder {
@@ -122,14 +123,14 @@ public class ProgressProtocolDecoder extends BaseProtocolDecoder {
                     position.set("archive", true);
                     int subtype = buf.readUnsignedShort();
                     if (subtype == MSG_ALARM) {
-                        position.set("alarm", true);
+                        position.set(Event.KEY_ALARM, true);
                     }
                     if (buf.readUnsignedShort() > buf.readableBytes()) {
                         lastIndex += 1;
                         break; // workaround for device bug
                     }
                     lastIndex = buf.readUnsignedInt();
-                    position.set("index", lastIndex);
+                    position.set(Event.KEY_INDEX, lastIndex);
                 } else {
                     newIndex = buf.readUnsignedInt();
                 }
@@ -157,16 +158,16 @@ public class ProgressProtocolDecoder extends BaseProtocolDecoder {
 
                 // Satellites
                 int satellitesNumber = buf.readUnsignedByte();
-                position.set("satellites", satellitesNumber);
+                position.set(Event.KEY_SATELLITES, satellitesNumber);
 
                 // Validity
                 position.setValid(satellitesNumber >= 3); // TODO: probably wrong
 
                 // Cell signal
-                position.set("gsm", buf.readUnsignedByte());
+                position.set(Event.KEY_GSM, buf.readUnsignedByte());
 
-                // Milage
-                position.set("milage", buf.readUnsignedInt());
+                // Odometer
+                position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
 
                 long extraFlags = buf.readLong();
 
@@ -208,7 +209,7 @@ public class ProgressProtocolDecoder extends BaseProtocolDecoder {
                     byte[] response = {(byte)0xC9,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
                     channel.write(ChannelBuffers.wrappedBuffer(response));
 
-                    position.set("alarm", true);
+                    position.set(Event.KEY_ALARM, true);
                 }
 
                 // Skip CRC
diff --git a/src/org/traccar/protocol/Pt3000ProtocolDecoder.java b/src/org/traccar/protocol/Pt3000ProtocolDecoder.java
index bef5f138d..01b7b284c 100644
--- a/src/org/traccar/protocol/Pt3000ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Pt3000ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Pt3000ProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/Pt502ProtocolDecoder.java b/src/org/traccar/protocol/Pt502ProtocolDecoder.java
index 6647f7e20..3db463cf6 100644
--- a/src/org/traccar/protocol/Pt502ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Pt502ProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;

 

 import org.traccar.BaseProtocolDecoder;

+import org.traccar.model.Event;

 import org.traccar.model.Position;

 

 public class Pt502ProtocolDecoder extends BaseProtocolDecoder {

diff --git a/src/org/traccar/protocol/RitiProtocolDecoder.java b/src/org/traccar/protocol/RitiProtocolDecoder.java
index 06aa39a71..7c53ec37f 100644
--- a/src/org/traccar/protocol/RitiProtocolDecoder.java
+++ b/src/org/traccar/protocol/RitiProtocolDecoder.java
@@ -27,6 +27,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class RitiProtocolDecoder extends BaseProtocolDecoder {
@@ -69,14 +70,14 @@ public class RitiProtocolDecoder extends BaseProtocolDecoder {
 
         position.set("mode", buf.readUnsignedByte());
         position.set("command", buf.readUnsignedByte());
-        position.set("power", buf.readUnsignedShort());
+        position.set(Event.KEY_POWER, buf.readUnsignedShort());
         
         buf.skipBytes(5);
         buf.readUnsignedShort();
         buf.readUnsignedShort();
         
         position.set("distance", buf.readUnsignedInt());
-        position.set("milage", buf.readUnsignedInt());
+        position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
         
         // Parse GPRMC
         Integer end = ChannelBufferTools.find(buf, buf.readerIndex(), buf.readerIndex() + 80, "*");
diff --git a/src/org/traccar/protocol/RuptelaProtocolDecoder.java b/src/org/traccar/protocol/RuptelaProtocolDecoder.java
index c68a7cedd..0cca3de26 100644
--- a/src/org/traccar/protocol/RuptelaProtocolDecoder.java
+++ b/src/org/traccar/protocol/RuptelaProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class RuptelaProtocolDecoder extends BaseProtocolDecoder {
@@ -76,12 +77,12 @@ public class RuptelaProtocolDecoder extends BaseProtocolDecoder {
 
                 // Validity
                 int satellites = buf.readUnsignedByte();
-                position.set("satellites", satellites);
+                position.set(Event.KEY_SATELLITES, satellites);
                 position.setValid(satellites >= 3);
 
                 position.setSpeed(buf.readUnsignedShort() * 0.539957);
 
-                position.set("hdop", buf.readUnsignedByte() / 10.0);
+                position.set(Event.KEY_HDOP, buf.readUnsignedByte() / 10.0);
 
                 buf.readUnsignedByte();
 
diff --git a/src/org/traccar/protocol/SanavProtocolDecoder.java b/src/org/traccar/protocol/SanavProtocolDecoder.java
index 0e84832de..91bba54c7 100644
--- a/src/org/traccar/protocol/SanavProtocolDecoder.java
+++ b/src/org/traccar/protocol/SanavProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class SanavProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/SkypatrolProtocolDecoder.java b/src/org/traccar/protocol/SkypatrolProtocolDecoder.java
index 09eacacd3..acb4fa5ec 100644
--- a/src/org/traccar/protocol/SkypatrolProtocolDecoder.java
+++ b/src/org/traccar/protocol/SkypatrolProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.Log;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class SkypatrolProtocolDecoder extends BaseProtocolDecoder {
@@ -80,7 +81,7 @@ public class SkypatrolProtocolDecoder extends BaseProtocolDecoder {
 
             // Status code
             if (checkBit(mask, 1)) {
-                position.set("status", buf.readUnsignedInt());
+                position.set(Event.KEY_STATUS, buf.readUnsignedInt());
             }
 
             // Device id
@@ -171,7 +172,7 @@ public class SkypatrolProtocolDecoder extends BaseProtocolDecoder {
 
             // Satellites
             if (checkBit(mask, 16)) {
-                position.set("satellites", buf.readUnsignedByte());
+                position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
             }
 
             // Battery percentage
@@ -179,14 +180,14 @@ public class SkypatrolProtocolDecoder extends BaseProtocolDecoder {
                 buf.readUnsignedShort();
             }
 
-            // Trip milage
+            // Trip odometer
             if (checkBit(mask, 20)) {
                 position.set("trip", buf.readUnsignedInt());
             }
 
-            // Milage
+            // Odometer
             if (checkBit(mask, 21)) {
-                position.set("milage", buf.readUnsignedInt());
+                position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
             }
 
             // Time of message generation
@@ -196,7 +197,7 @@ public class SkypatrolProtocolDecoder extends BaseProtocolDecoder {
 
             // Battery level
             if (checkBit(mask, 24)) {
-                position.set("power", buf.readUnsignedShort() / 1000.0);
+                position.set(Event.KEY_POWER, buf.readUnsignedShort() / 1000.0);
             }
 
             // GPS overspeed
@@ -211,7 +212,7 @@ public class SkypatrolProtocolDecoder extends BaseProtocolDecoder {
 
             // Sequence number
             if (checkBit(mask, 28)) {
-                position.set("index", buf.readUnsignedShort());
+                position.set(Event.KEY_INDEX, buf.readUnsignedShort());
             }
 
             return position;
diff --git a/src/org/traccar/protocol/Stl060ProtocolDecoder.java b/src/org/traccar/protocol/Stl060ProtocolDecoder.java
index d5ad651e7..d3db10d90 100644
--- a/src/org/traccar/protocol/Stl060ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Stl060ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Stl060ProtocolDecoder extends BaseProtocolDecoder {
@@ -43,7 +44,7 @@ public class Stl060ProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{3})(\\d{2})\\.?(\\d+)([EW])," + // Longitude
             "(\\d+\\.?\\d*)," +                 // Speed
             "(\\d+\\.?\\d*)," +                 // Course
-            "(\\d+)," +                         // Milage
+            "(\\d+)," +                         // Odometer
             "(\\d+)," +                         // Ignition
             "(\\d+)," +                         // DIP1
             "(\\d+)," +                         // DIP2
@@ -108,11 +109,11 @@ public class Stl060ProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // Other
-        position.set("milage", Integer.valueOf(parser.group(index++)));
+        position.set(Event.KEY_ODOMETER, Integer.valueOf(parser.group(index++)));
         position.set("ignition", Integer.valueOf(parser.group(index++)));
         position.set("dip1", Integer.valueOf(parser.group(index++)));
         position.set("dip2", Integer.valueOf(parser.group(index++)));
-        position.set("fuel", Integer.valueOf(parser.group(index++)));
+        position.set(Event.KEY_FUEL, Integer.valueOf(parser.group(index++)));
 
         // Validity
         position.setValid(parser.group(index++).compareTo("A") == 0);
diff --git a/src/org/traccar/protocol/SuntechProtocolDecoder.java b/src/org/traccar/protocol/SuntechProtocolDecoder.java
index 5ebf175d8..debdb4209 100644
--- a/src/org/traccar/protocol/SuntechProtocolDecoder.java
+++ b/src/org/traccar/protocol/SuntechProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class SuntechProtocolDecoder extends BaseProtocolDecoder {
@@ -86,7 +87,7 @@ public class SuntechProtocolDecoder extends BaseProtocolDecoder {
         position.setTime(time.getTime());
         
         // Cell
-        position.set("cell", parser.group(index++));
+        position.set(Event.KEY_CELL, parser.group(index++));
 
         // Coordinates
         position.setLatitude(Double.valueOf(parser.group(index++)));
diff --git a/src/org/traccar/protocol/SyrusProtocolDecoder.java b/src/org/traccar/protocol/SyrusProtocolDecoder.java
index 56975d09d..8a12b5e26 100644
--- a/src/org/traccar/protocol/SyrusProtocolDecoder.java
+++ b/src/org/traccar/protocol/SyrusProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class SyrusProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/T55ProtocolDecoder.java b/src/org/traccar/protocol/T55ProtocolDecoder.java
index a1a325c75..f20eb1bf7 100644
--- a/src/org/traccar/protocol/T55ProtocolDecoder.java
+++ b/src/org/traccar/protocol/T55ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class T55ProtocolDecoder extends BaseProtocolDecoder {
@@ -310,7 +311,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
             position.setAltitude(Double.valueOf(parser.group(index++)));
 
             // Battery
-            position.set("battery", parser.group(index++));
+            position.set(Event.KEY_BATTERY, parser.group(index++));
             return position;
         }
 
diff --git a/src/org/traccar/protocol/TelikProtocolDecoder.java b/src/org/traccar/protocol/TelikProtocolDecoder.java
index edbf10548..918934bce 100644
--- a/src/org/traccar/protocol/TelikProtocolDecoder.java
+++ b/src/org/traccar/protocol/TelikProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class TelikProtocolDecoder extends BaseProtocolDecoder {
@@ -99,7 +100,7 @@ public class TelikProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // Satellites
-        position.set("satellites", parser.group(index++));
+        position.set(Event.KEY_SATELLITES, parser.group(index++));
 
         return position;
     }
diff --git a/src/org/traccar/protocol/TeltonikaProtocolDecoder.java b/src/org/traccar/protocol/TeltonikaProtocolDecoder.java
index 7ca670fb3..85d1b939d 100644
--- a/src/org/traccar/protocol/TeltonikaProtocolDecoder.java
+++ b/src/org/traccar/protocol/TeltonikaProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
@@ -110,17 +111,17 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
                 
                 if (checkBit(locationMask, 4)) {
                     int satellites = buf.readUnsignedByte();
-                    position.set("satellites", satellites);
+                    position.set(Event.KEY_SATELLITES, satellites);
                     position.setValid(satellites >= 3);
                 }
                 
                 if (checkBit(locationMask, 5)) {
                     position.set("area", buf.readUnsignedShort());
-                    position.set("cell", buf.readUnsignedShort());
+                    position.set(Event.KEY_CELL, buf.readUnsignedShort());
                 }
                 
                 if (checkBit(locationMask, 6)) {
-                    position.set("gsm", buf.readUnsignedByte());
+                    position.set(Event.KEY_GSM, buf.readUnsignedByte());
                 }
                 
                 if (checkBit(locationMask, 7)) {
@@ -139,13 +140,13 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
                 position.setCourse(buf.readUnsignedShort());
 
                 int satellites = buf.readUnsignedByte();
-                position.set("satellites", satellites);
+                position.set(Event.KEY_SATELLITES, satellites);
 
                 position.setValid(satellites != 0);
 
                 position.setSpeed(buf.readUnsignedShort() * 0.539957);
 
-                position.set("event", buf.readUnsignedByte());
+                position.set(Event.KEY_EVENT, buf.readUnsignedByte());
 
                 buf.readUnsignedByte(); // total IO data records
 
@@ -157,7 +158,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
                 for (int j = 0; j < cnt; j++) {
                     int id = buf.readUnsignedByte();
                     if (id == 1) {
-                        position.set("power", buf.readUnsignedByte());
+                        position.set(Event.KEY_POWER, buf.readUnsignedByte());
                     } else {
                         position.set("io" + id, buf.readUnsignedByte());
                     }
diff --git a/src/org/traccar/protocol/Tk102ProtocolDecoder.java b/src/org/traccar/protocol/Tk102ProtocolDecoder.java
index 9eef7cc91..020fb8013 100644
--- a/src/org/traccar/protocol/Tk102ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tk102ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Tk102ProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/Tk103ProtocolDecoder.java b/src/org/traccar/protocol/Tk103ProtocolDecoder.java
index 948fd9fd5..7a3a048fe 100644
--- a/src/org/traccar/protocol/Tk103ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tk103ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
@@ -46,7 +47,7 @@ public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{2})(\\d{2})(\\d{2}),?" + // Time (HHMMSS)
             "(\\d+\\.?\\d+),?" +           // Course
             "([0-9a-fA-F]{8})?,?" +        // State
-            "(?:L([0-9a-fA-F]+))?\\)?");   // Milage
+            "(?:L([0-9a-fA-F]+))?\\)?");   // Odometer
 
     @Override
     protected Object decode(
@@ -133,10 +134,10 @@ public class Tk103ProtocolDecoder extends BaseProtocolDecoder {
         // State
         position.set("state", parser.group(index++));
 
-        // Milage
-        String milage = parser.group(index++);
-        if (milage != null) {
-            position.set("milage", Long.parseLong(milage, 16));
+        // Odometer
+        String odometer = parser.group(index++);
+        if (odometer != null) {
+            position.set(Event.KEY_ODOMETER, Long.parseLong(odometer, 16));
         }
         return position;
     }
diff --git a/src/org/traccar/protocol/Tlt2hProtocolDecoder.java b/src/org/traccar/protocol/Tlt2hProtocolDecoder.java
index b70811dd5..ecc61d740 100644
--- a/src/org/traccar/protocol/Tlt2hProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tlt2hProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Tlt2hProtocolDecoder extends BaseProtocolDecoder {
@@ -91,7 +92,7 @@ public class Tlt2hProtocolDecoder extends BaseProtocolDecoder {
                 Integer index = 1;
                 
                 // Cell
-                position.set("cell", parser.group(index++));
+                position.set(Event.KEY_CELL, parser.group(index++));
 
                 // Time
                 Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
@@ -135,7 +136,7 @@ public class Tlt2hProtocolDecoder extends BaseProtocolDecoder {
                 position.setTime(time.getTime());
                 
                 // Status
-                position.set("status", status);
+                position.set(Event.KEY_STATUS, status);
                 positions.add(position);
             }
         }
diff --git a/src/org/traccar/protocol/TopflytechProtocolDecoder.java b/src/org/traccar/protocol/TopflytechProtocolDecoder.java
index b0edb0276..e62f77c20 100644
--- a/src/org/traccar/protocol/TopflytechProtocolDecoder.java
+++ b/src/org/traccar/protocol/TopflytechProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class TopflytechProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/TotemProtocolDecoder.java b/src/org/traccar/protocol/TotemProtocolDecoder.java
index faff9d300..fe39a6344 100644
--- a/src/org/traccar/protocol/TotemProtocolDecoder.java
+++ b/src/org/traccar/protocol/TotemProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class TotemProtocolDecoder extends BaseProtocolDecoder {
@@ -59,7 +60,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             "(?:(\\d+)\\|)?" +                  // ADC
             "(\\p{XDigit}{8})\\|" +             // Location Code
             "(\\d+)\\|" +                       // Temperature
-            "(\\d+.\\d+)\\|" +                  // Milage
+            "(\\d+.\\d+)\\|" +                  // Odometer
             "\\d+\\|" +                         // Serial Number
             ".*\\|?" +
             "\\p{XDigit}{4}");                  // Checksum
@@ -86,7 +87,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             "(\\d+)\\|" +                       // ADC
             "(\\p{XDigit}{8})\\|" +             // Location Code
             "(\\d+)\\|" +                       // Temperature
-            "(\\d+.\\d+)\\|" +                  // Milage
+            "(\\d+.\\d+)\\|" +                  // Odometer
             "\\d+\\|" +                         // Serial Number
             "\\p{XDigit}{4}");                  // Checksum
 
@@ -111,7 +112,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             "(\\d{3})" +                        // Course
             "(\\d{3})" +                        // Speed
             "(\\d{2}\\.\\d)" +                  // PDOP
-            "(\\d{7})" +                        // Milage
+            "(\\d{7})" +                        // Odometer
             "(\\d{2})(\\d{2}\\.\\d{4})" +       // Latitude (DDMM.MMMM)
             "([NS])" +
             "(\\d{3})(\\d{2}\\.\\d{4})" +       // Longitude (DDDMM.MMMM)
@@ -169,7 +170,7 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
         position.setDeviceId(getDeviceId());
         
         // Alarm type
-        position.set("alarm", parser.group(index++));
+        position.set(Event.KEY_ALARM, parser.group(index++));
         
         if (format == MessageFormat.first || format == MessageFormat.second) {
 
@@ -227,26 +228,26 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             position.setTime(time.getTime());
 
             // Accuracy
-            position.set("hdop", parser.group(index++));
+            position.set(Event.KEY_HDOP, parser.group(index++));
 
             // IO Status
             position.set("io", parser.group(index++));
 
             // Power
-            position.set("battery", parser.group(index++));
-            position.set("power", Double.valueOf(parser.group(index++)));
+            position.set(Event.KEY_BATTERY, parser.group(index++));
+            position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
 
             // ADC
             position.set("adc", parser.group(index++));
 
             // Location Code
-            position.set("lac", parser.group(index++));
+            position.set(Event.KEY_LAC, parser.group(index++));
 
             // Temperature
-            position.set("temperature", parser.group(index++));
+            position.set(Event.KEY_TEMPERATURE, parser.group(index++));
 
-            // Milage
-            position.set("milage", parser.group(index++));
+            // Odometer
+            position.set(Event.KEY_ODOMETER, parser.group(index++));
         
         } else if (format == MessageFormat.third) {
 
@@ -265,8 +266,8 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             position.set("io", parser.group(index++));
 
             // Power
-            position.set("battery", Double.valueOf(parser.group(index++)) / 10);
-            position.set("power", Double.valueOf(parser.group(index++)));
+            position.set(Event.KEY_BATTERY, Double.valueOf(parser.group(index++)) / 10);
+            position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
 
             // ADC
             position.set("adc1", parser.group(index++));
@@ -277,13 +278,13 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             position.set("temperature2", parser.group(index++));
 
             // Location Code
-            position.set("lac", parser.group(index++));
+            position.set(Event.KEY_LAC, parser.group(index++));
 
             // Validity
             position.setValid(parser.group(index++).compareTo("A") == 0);
 
             // Satellites
-            position.set("satellites", parser.group(index++));
+            position.set(Event.KEY_SATELLITES, parser.group(index++));
 
             // Course
             position.setCourse(Double.valueOf(parser.group(index++)));
@@ -294,8 +295,8 @@ public class TotemProtocolDecoder extends BaseProtocolDecoder {
             // PDOP
             position.set("pdop", parser.group(index++));
 
-            // Milage
-            position.set("milage", parser.group(index++));
+            // Odometer
+            position.set(Event.KEY_ODOMETER, parser.group(index++));
 
             // Latitude
             Double latitude = Double.valueOf(parser.group(index++));
diff --git a/src/org/traccar/protocol/Tr20ProtocolDecoder.java b/src/org/traccar/protocol/Tr20ProtocolDecoder.java
index cbf1f34c0..cd0bde746 100644
--- a/src/org/traccar/protocol/Tr20ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tr20ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Tr20ProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/Tr900ProtocolDecoder.java b/src/org/traccar/protocol/Tr900ProtocolDecoder.java
index b118161e2..67783049d 100644
--- a/src/org/traccar/protocol/Tr900ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Tr900ProtocolDecoder.java
@@ -18,6 +18,7 @@ package org.traccar.protocol;
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.util.Calendar;
@@ -112,12 +113,12 @@ public class Tr900ProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // Other
-        position.set("gsm", parser.group(index++));
-        position.set("event", Integer.valueOf(parser.group(index++)));
+        position.set(Event.KEY_GSM, parser.group(index++));
+        position.set(Event.KEY_EVENT, Integer.valueOf(parser.group(index++)));
         position.set("adc1", Integer.valueOf(parser.group(index++)));
-        position.set("battery", Integer.valueOf(parser.group(index++)));
-        position.set("input", parser.group(index++));
-        position.set("status", parser.group(index++));
+        position.set(Event.KEY_BATTERY, Integer.valueOf(parser.group(index++)));
+        position.set(Event.KEY_INPUT, parser.group(index++));
+        position.set(Event.KEY_STATUS, parser.group(index++));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/TrackboxProtocolDecoder.java b/src/org/traccar/protocol/TrackboxProtocolDecoder.java
index f53d0a2ed..2bcde0602 100644
--- a/src/org/traccar/protocol/TrackboxProtocolDecoder.java
+++ b/src/org/traccar/protocol/TrackboxProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class TrackboxProtocolDecoder extends BaseProtocolDecoder {
@@ -101,7 +102,7 @@ public class TrackboxProtocolDecoder extends BaseProtocolDecoder {
             position.setLongitude(longitude);
             
             // HDOP
-            position.set("hdop", parser.group(index++));
+            position.set(Event.KEY_HDOP, parser.group(index++));
 
             // Altitude
             position.setAltitude(Double.valueOf(parser.group(index++)));
@@ -125,7 +126,7 @@ public class TrackboxProtocolDecoder extends BaseProtocolDecoder {
             position.setTime(time.getTime());
 
             // Satellites
-            position.set("satellites", parser.group(index++));
+            position.set(Event.KEY_SATELLITES, parser.group(index++));
 
             return position;
         }
diff --git a/src/org/traccar/protocol/TramigoProtocolDecoder.java b/src/org/traccar/protocol/TramigoProtocolDecoder.java
index c36ee91b1..b578efb4a 100644
--- a/src/org/traccar/protocol/TramigoProtocolDecoder.java
+++ b/src/org/traccar/protocol/TramigoProtocolDecoder.java
@@ -20,6 +20,7 @@ import org.jboss.netty.buffer.ChannelBuffers;
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.nio.charset.Charset;
@@ -60,7 +61,7 @@ public class TramigoProtocolDecoder extends BaseProtocolDecoder {
         // Create new position
         Position position = new Position();
         position.setProtocol(getProtocol());
-        position.set("index", index);
+        position.set(Event.KEY_INDEX, index);
         position.setValid(true);
 
         // Get device id
@@ -89,7 +90,7 @@ public class TramigoProtocolDecoder extends BaseProtocolDecoder {
 
             buf.readUnsignedInt(); // distance
 
-            position.set("battery", buf.readUnsignedShort());
+            position.set(Event.KEY_BATTERY, buf.readUnsignedShort());
 
             buf.readUnsignedShort(); // battery charger status
 
diff --git a/src/org/traccar/protocol/TytanProtocolDecoder.java b/src/org/traccar/protocol/TytanProtocolDecoder.java
index 56b8f5622..6b08c3762 100644
--- a/src/org/traccar/protocol/TytanProtocolDecoder.java
+++ b/src/org/traccar/protocol/TytanProtocolDecoder.java
@@ -27,6 +27,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class TytanProtocolDecoder extends BaseProtocolDecoder {
@@ -69,8 +70,8 @@ public class TytanProtocolDecoder extends BaseProtocolDecoder {
             position.setTime(new Date(buf.readUnsignedInt() * 1000));
             
             int flags = buf.readUnsignedByte();
-            position.set("gps", flags >> 5);
-            position.set("gsm", flags & 0x07);
+            position.set(Event.KEY_GPS, flags >> 5);
+            position.set(Event.KEY_GSM, flags & 0x07);
             position.setValid(((flags & 0x08) != 0) ^ ((flags & 0x10) != 0));
             
             // Latitude
@@ -97,20 +98,20 @@ public class TytanProtocolDecoder extends BaseProtocolDecoder {
             while (buf.readerIndex() < end) {
                 switch (buf.readUnsignedByte()) {
                     case 2:
-                        position.set("milage", buf.readUnsignedMedium());
+                        position.set(Event.KEY_ODOMETER, buf.readUnsignedMedium());
                         break;
                     case 4:
                         buf.readUnsignedShort(); // device start
                         break;
                     case 5:
-                        position.set("input", buf.readUnsignedByte());
+                        position.set(Event.KEY_INPUT, buf.readUnsignedByte());
                         break;
                     case 6:
                         buf.readUnsignedShort();
                         position.set("adc", buf.readFloat());
                         break;
                     case 7:
-                        position.set("alarm", buf.readUnsignedShort());
+                        position.set(Event.KEY_ALARM, buf.readUnsignedShort());
                         break;
                     case 8:
                         position.set("antihijack", buf.readUnsignedByte());
@@ -123,7 +124,7 @@ public class TytanProtocolDecoder extends BaseProtocolDecoder {
                         break;
                     case 24:
                         buf.readUnsignedByte();
-                        position.set("temperature", buf.readUnsignedByte());
+                        position.set(Event.KEY_TEMPERATURE, buf.readUnsignedByte());
                         break;
                     case 25:
                         buf.readUnsignedByte();
@@ -161,7 +162,7 @@ public class TytanProtocolDecoder extends BaseProtocolDecoder {
                         buf.readUnsignedInt(); // diagnostic
                         break;
                     case 90:
-                        position.set("power", buf.readFloat());
+                        position.set(Event.KEY_POWER, buf.readFloat());
                         break;
                     case 99:
                         buf.readUnsignedInt(); // tachograph
@@ -182,7 +183,7 @@ public class TytanProtocolDecoder extends BaseProtocolDecoder {
                         buf.readUnsignedByte(); // engine load
                         break;
                     case 107:
-                        position.set("fuel", buf.readUnsignedShort() & 0x3fff);
+                        position.set(Event.KEY_FUEL, buf.readUnsignedShort() & 0x3fff);
                         break;
                     case 108:
                         buf.readUnsignedInt(); // total distance
diff --git a/src/org/traccar/protocol/UlbotechProtocolDecoder.java b/src/org/traccar/protocol/UlbotechProtocolDecoder.java
index 04b39d078..af61b0b6e 100644
--- a/src/org/traccar/protocol/UlbotechProtocolDecoder.java
+++ b/src/org/traccar/protocol/UlbotechProtocolDecoder.java
@@ -20,6 +20,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.ChannelBufferTools;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.util.Date;
@@ -33,7 +34,7 @@ public class UlbotechProtocolDecoder extends BaseProtocolDecoder {
     private static final short DATA_GPS = 0x01;
     private static final short DATA_LBS = 0x02;
     private static final short DATA_STATUS = 0x03;
-    private static final short DATA_MILAGE = 0x04;
+    private static final short DATA_ODOMETER = 0x04;
     private static final short DATA_ADC = 0x05;
     private static final short DATA_GEOFENCE = 0x06;
     private static final short DATA_OBD2 = 0x07;
@@ -85,7 +86,7 @@ public class UlbotechProtocolDecoder extends BaseProtocolDecoder {
                     position.setLongitude(buf.readInt() / 1000000.0);
                     position.setSpeed(buf.readUnsignedShort() * 0.539957);
                     position.setCourse(buf.readUnsignedShort());
-                    position.set("hdop", buf.readUnsignedShort());
+                    position.set(Event.KEY_HDOP, buf.readUnsignedShort());
                     break;
 
                 default:
diff --git a/src/org/traccar/protocol/V680ProtocolDecoder.java b/src/org/traccar/protocol/V680ProtocolDecoder.java
index a6b5e1bc1..1558c7d8e 100644
--- a/src/org/traccar/protocol/V680ProtocolDecoder.java
+++ b/src/org/traccar/protocol/V680ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class V680ProtocolDecoder extends BaseProtocolDecoder {
@@ -96,13 +97,13 @@ public class V680ProtocolDecoder extends BaseProtocolDecoder {
             position.set("password", parser.group(index++));
 
             // Event
-            position.set("event", parser.group(index++));
+            position.set(Event.KEY_EVENT, parser.group(index++));
 
             // Packet number
             position.set("packet", parser.group(index++));
 
             // GSM base station
-            position.set("gsm", parser.group(index++));
+            position.set(Event.KEY_GSM, parser.group(index++));
 
             // Longitude
             String lon = parser.group(index++);
diff --git a/src/org/traccar/protocol/VisiontekProtocolDecoder.java b/src/org/traccar/protocol/VisiontekProtocolDecoder.java
index 2c3dad570..b9ac60f27 100644
--- a/src/org/traccar/protocol/VisiontekProtocolDecoder.java
+++ b/src/org/traccar/protocol/VisiontekProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class VisiontekProtocolDecoder extends BaseProtocolDecoder {
@@ -44,7 +45,7 @@ public class VisiontekProtocolDecoder extends BaseProtocolDecoder {
             "(\\d+)," +                         // Course
             "(?:(\\d+)," +                      // Altitude
             "(\\d+),)?" +                       // Satellites
-            "(\\d+)," +                         // Milage
+            "(\\d+)," +                         // Odometer
             "(?:(\\d)," +                       // Ignition
             "(\\d)," +                          // Input 1
             "(\\d)," +                          // Input 2
@@ -118,14 +119,14 @@ public class VisiontekProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Additional data
-        position.set("satellites", parser.group(index++));
-        position.set("milage", parser.group(index++));
+        position.set(Event.KEY_SATELLITES, parser.group(index++));
+        position.set(Event.KEY_ODOMETER, parser.group(index++));
         position.set("ignition", parser.group(index++));
         position.set("input1", parser.group(index++));
         position.set("input2", parser.group(index++));
         position.set("immobilizer", parser.group(index++));
-        position.set("power", parser.group(index++));
-        position.set("gsm", parser.group(index++));
+        position.set(Event.KEY_POWER, parser.group(index++));
+        position.set(Event.KEY_GSM, parser.group(index++));
 
         // Validity
         position.setValid(parser.group(index++).compareTo("A") == 0);
diff --git a/src/org/traccar/protocol/WialonProtocolDecoder.java b/src/org/traccar/protocol/WialonProtocolDecoder.java
index 6f0223112..3dc282846 100644
--- a/src/org/traccar/protocol/WialonProtocolDecoder.java
+++ b/src/org/traccar/protocol/WialonProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class WialonProtocolDecoder extends BaseProtocolDecoder {
@@ -125,13 +126,13 @@ public class WialonProtocolDecoder extends BaseProtocolDecoder {
         String satellites = parser.group(index++);
         if (satellites != null) {
             position.setValid(Integer.valueOf(satellites) >= 3);
-            position.set("satellites", satellites);
+            position.set(Event.KEY_SATELLITES, satellites);
         } else {
             position.setValid(false);
         }
 
         // Other
-        position.set("hdop", parser.group(index++));
+        position.set(Event.KEY_HDOP, parser.group(index++));
         position.set("inputs", parser.group(index++));
         position.set("outputs", parser.group(index++));
 
diff --git a/src/org/traccar/protocol/WondexProtocolDecoder.java b/src/org/traccar/protocol/WondexProtocolDecoder.java
index cf4a3fedd..1eb727fc6 100644
--- a/src/org/traccar/protocol/WondexProtocolDecoder.java
+++ b/src/org/traccar/protocol/WondexProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class WondexProtocolDecoder extends BaseProtocolDecoder {
@@ -45,7 +46,7 @@ public class WondexProtocolDecoder extends BaseProtocolDecoder {
             "(\\d+)," +                    // Satellites
             "(\\d+),?" +                   // Event
             "(?:(\\d+\\.\\d+)V,)?" +       // Battery
-            "(\\d+\\.\\d+)?,?" +           // Milage
+            "(\\d+\\.\\d+)?,?" +           // Odometer
             "(\\d+)?,?" +                  // Input
             "(\\d+\\.\\d+)?,?" +           // ADC1
             "(\\d+\\.\\d+)?,?" +           // ADC2
@@ -94,26 +95,26 @@ public class WondexProtocolDecoder extends BaseProtocolDecoder {
         // Satellites
         int satellites = Integer.valueOf(parser.group(index++));
         position.setValid(satellites >= 3);
-        position.set("satellites", satellites);
+        position.set(Event.KEY_SATELLITES, satellites);
         
         // Event
-        position.set("event", parser.group(index++));
+        position.set(Event.KEY_EVENT, parser.group(index++));
         
         // Battery
-        position.set("battery", parser.group(index++));
+        position.set(Event.KEY_BATTERY, parser.group(index++));
         
-        // Milage
-        position.set("milage", parser.group(index++));
+        // Odometer
+        position.set(Event.KEY_ODOMETER, parser.group(index++));
         
         // Input
-        position.set("input", parser.group(index++));
+        position.set(Event.KEY_INPUT, parser.group(index++));
         
         // ADC
         position.set("adc1", parser.group(index++));
         position.set("adc2", parser.group(index++));
         
         // Output
-        position.set("output", parser.group(index++));
+        position.set(Event.KEY_OUTPUT, parser.group(index++));
         return position;
     }
 
diff --git a/src/org/traccar/protocol/Xexun2ProtocolDecoder.java b/src/org/traccar/protocol/Xexun2ProtocolDecoder.java
index 420dfc8d0..8b654bef3 100644
--- a/src/org/traccar/protocol/Xexun2ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Xexun2ProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Xexun2ProtocolDecoder extends BaseProtocolDecoder {
@@ -123,7 +124,7 @@ public class Xexun2ProtocolDecoder extends BaseProtocolDecoder {
         position.set("signal", parser.group(index++));
 
         // Alarm
-        position.set("alarm", parser.group(index++));
+        position.set(Event.KEY_ALARM, parser.group(index++));
 
         // Get device by IMEI
         if (!identify(parser.group(index++))) {
@@ -132,7 +133,7 @@ public class Xexun2ProtocolDecoder extends BaseProtocolDecoder {
         position.setDeviceId(getDeviceId());
 
         // Satellites
-        position.set("satellites", parser.group(index++).replaceFirst ("^0*(?![\\.$])", ""));
+        position.set(Event.KEY_SATELLITES, parser.group(index++).replaceFirst ("^0*(?![\\.$])", ""));
 
         // Altitude
         String altitude = parser.group(index++);
@@ -141,7 +142,7 @@ public class Xexun2ProtocolDecoder extends BaseProtocolDecoder {
         }
 
         // Power
-        position.set("power", Double.valueOf(parser.group(index++)));
+        position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
 
         return position;
     }
diff --git a/src/org/traccar/protocol/XexunProtocolDecoder.java b/src/org/traccar/protocol/XexunProtocolDecoder.java
index d54e6fb20..231d7a969 100644
--- a/src/org/traccar/protocol/XexunProtocolDecoder.java
+++ b/src/org/traccar/protocol/XexunProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class XexunProtocolDecoder extends BaseProtocolDecoder {
diff --git a/src/org/traccar/protocol/XirgoProtocolDecoder.java b/src/org/traccar/protocol/XirgoProtocolDecoder.java
index 813a7a995..74b1bd077 100644
--- a/src/org/traccar/protocol/XirgoProtocolDecoder.java
+++ b/src/org/traccar/protocol/XirgoProtocolDecoder.java
@@ -25,6 +25,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class XirgoProtocolDecoder extends BaseProtocolDecoder {
@@ -48,7 +49,7 @@ public class XirgoProtocolDecoder extends BaseProtocolDecoder {
             "(\\d+)," +                         // HDOP
             "(\\d+\\.\\d+)," +                  // Battery
             "(\\d+)," +                         // GSM
-            "(\\d+\\.?\\d*)," +                 // Milage
+            "(\\d+\\.?\\d*)," +                 // Odometer
             "(\\d+)," +                         // GPS
             ".*");
 
@@ -77,7 +78,7 @@ public class XirgoProtocolDecoder extends BaseProtocolDecoder {
         }
         position.setDeviceId(getDeviceId());
 
-        position.set("event", parser.group(index++));
+        position.set(Event.KEY_EVENT, parser.group(index++));
         
         // Date
         Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
@@ -98,11 +99,11 @@ public class XirgoProtocolDecoder extends BaseProtocolDecoder {
         position.setCourse(Double.valueOf(parser.group(index++)));
 
         // Additional data
-        position.set("satellites", parser.group(index++));
-        position.set("hdop", parser.group(index++));
-        position.set("battery", parser.group(index++));
-        position.set("gsm", parser.group(index++));
-        position.set("milage", parser.group(index++));
+        position.set(Event.KEY_SATELLITES, parser.group(index++));
+        position.set(Event.KEY_HDOP, parser.group(index++));
+        position.set(Event.KEY_BATTERY, parser.group(index++));
+        position.set(Event.KEY_GSM, parser.group(index++));
+        position.set(Event.KEY_ODOMETER, parser.group(index++));
         
         // Validity
         position.setValid(Integer.valueOf(parser.group(index++)) == 1);
diff --git a/src/org/traccar/protocol/Xt013ProtocolDecoder.java b/src/org/traccar/protocol/Xt013ProtocolDecoder.java
index c1e1c3e65..62deed0ea 100644
--- a/src/org/traccar/protocol/Xt013ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Xt013ProtocolDecoder.java
@@ -18,6 +18,7 @@ package org.traccar.protocol;
 import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 import java.text.ParseException;
@@ -99,9 +100,9 @@ public class Xt013ProtocolDecoder extends BaseProtocolDecoder {
         position.setValid(parser.group(index++).equals("F"));
 
         // Other
-        position.set("gps", parser.group(index++));
-        position.set("gsm", parser.group(index++));
-        position.set("battery", parser.group(index++));
+        position.set(Event.KEY_GPS, parser.group(index++));
+        position.set(Event.KEY_GSM, parser.group(index++));
+        position.set(Event.KEY_BATTERY, parser.group(index++));
         position.set("charging", parser.group(index++));
         return position;
     }
diff --git a/src/org/traccar/protocol/Xt7ProtocolDecoder.java b/src/org/traccar/protocol/Xt7ProtocolDecoder.java
index 564cbaf67..fab55c0c2 100644
--- a/src/org/traccar/protocol/Xt7ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Xt7ProtocolDecoder.java
@@ -26,6 +26,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class Xt7ProtocolDecoder extends BaseProtocolDecoder {
@@ -129,13 +130,13 @@ public class Xt7ProtocolDecoder extends BaseProtocolDecoder {
         position.set("imsi", parser.group(index++));
 
         // Cell
-        position.set("cell", parser.group(index++));
+        position.set(Event.KEY_CELL, parser.group(index++));
 
         // GSM signal quality
-        position.set("gsm", parser.group(index++));
+        position.set(Event.KEY_GSM, parser.group(index++));
         
         // Battery
-        position.set("power", Double.valueOf(parser.group(index++)));
+        position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
         
         // Flags
         position.set("flags", parser.group(index++));
@@ -144,10 +145,10 @@ public class Xt7ProtocolDecoder extends BaseProtocolDecoder {
         position.set("sensors", parser.group(index++));
 
         // Fuel
-        position.set("fuel", parser.group(index++));
+        position.set(Event.KEY_FUEL, parser.group(index++));
 
         // Alarm
-        position.set("alarm", parser.group(index++));
+        position.set(Event.KEY_ALARM, parser.group(index++));
 
         return position;
     }
diff --git a/src/org/traccar/protocol/YwtProtocolDecoder.java b/src/org/traccar/protocol/YwtProtocolDecoder.java
index 833ec4771..e216d61fc 100644
--- a/src/org/traccar/protocol/YwtProtocolDecoder.java
+++ b/src/org/traccar/protocol/YwtProtocolDecoder.java
@@ -24,6 +24,7 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.model.Event;
 import org.traccar.model.Position;
 
 public class YwtProtocolDecoder extends BaseProtocolDecoder {
@@ -128,13 +129,13 @@ public class YwtProtocolDecoder extends BaseProtocolDecoder {
         // Satellites
         int satellites = Integer.valueOf(parser.group(index++));
         position.setValid(satellites >= 3);
-        position.set("satellites", satellites);
+        position.set(Event.KEY_SATELLITES, satellites);
         
         // Report identifier
         String reportId = parser.group(index++);
         
         // Status
-        position.set("status", parser.group(index++));
+        position.set(Event.KEY_STATUS, parser.group(index++));
 
         // Send response
         if (type.equals("KP") || type.equals("EP") || type.equals("EP")) {