1 files changed, 2 insertions, 1 deletions
diff --git a/src/org/traccar/protocol/Tr20ProtocolDecoder.java b/src/org/traccar/protocol/Tr20ProtocolDecoder.java
index cd0bde746..048f510b4 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.helper.UnitsConverter;
 import org.traccar.model.Event;
 import org.traccar.model.Position;
 
@@ -116,7 +117,7 @@ public class Tr20ProtocolDecoder extends BaseProtocolDecoder {
             position.setLongitude(longitude * hemisphere);
 
             // Speed
-            position.setSpeed(Double.valueOf(parser.group(index++)) * 0.539957);
+            position.setSpeed(UnitsConverter.knotsFromKph(Double.valueOf(parser.group(index++))));
 
             // Course
             position.setCourse(Double.valueOf(parser.group(index++)));