1 files changed, 2 insertions, 1 deletions
diff --git a/src/org/traccar/protocol/Ardi01ProtocolDecoder.java b/src/org/traccar/protocol/Ardi01ProtocolDecoder.java
index fdd160bdd..3a254cf41 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.helper.UnitsConverter;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
 
@@ -84,7 +85,7 @@ public class Ardi01ProtocolDecoder extends BaseProtocolDecoder {
         // Location data
         position.setLongitude(Double.valueOf(parser.group(index++)));
         position.setLatitude(Double.valueOf(parser.group(index++)));
-        position.setSpeed(Double.valueOf(parser.group(index++)) * 0.539957);
+        position.setSpeed(UnitsConverter.knotsFromKph(Double.valueOf(parser.group(index++))));
         position.setCourse(Double.valueOf(parser.group(index++)));
         position.setAltitude(Double.valueOf(parser.group(index++)));