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-rw-r--r--src/main/java/org/traccar/protocol/MictrackProtocolDecoder.java2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/java/org/traccar/protocol/MictrackProtocolDecoder.java b/src/main/java/org/traccar/protocol/MictrackProtocolDecoder.java
index 992b5c43a..652ba3f6a 100644
--- a/src/main/java/org/traccar/protocol/MictrackProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/MictrackProtocolDecoder.java
@@ -54,7 +54,7 @@ public class MictrackProtocolDecoder extends BaseProtocolDecoder {
.expression("([EW]),")
.number("(d+.?d*)?,") // speed
.number("(d+.?d*)?,") // course
- .number("(d+.?d*)?,") // altitude
+ .number("(-?d+.?d*)?,") // altitude
.number("(dd)(dd)(dd)") // date (ddmmyy)
.compile();