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The GPS Location is being updated but jumping

The Global Positioning System (GPS) is influenced by many environmental factors. Each location is uniquely calculated and has its own accuracy associated.

A location determination at location X with an accuracy of 5m means that the real location is somehow within a 5m radius.

This is why the location can jump during the Live mode, even when the Tracker is under a clear sky and not moving.

This behavior can seem odd especially when the device is indoors and the accuracy drops to 20-30m.
In Basic Mode the location is updating less often than in Live Mode, which is updating every 4 seconds. This is why you might be able to notice the location jumping.

 

Further information about GPS can be found at the official GPS website by the US government:

http://www.gps.gov/