GPS tracking is accurate up to 2.5m depending on the tracker, weather and the number of satellites that the tracker is able to "see". Based on this information the tracker then generates a set of co-ordinates called longitude and latitude.

The co-ordinates are then referenced against an industry wide database to provide an address which is associated with the co-ordinates. This address look up will be slightly less accurate than the GPS co-ordinates but will be very close. 

If you need to know an accurate location of the tracker, use the map and the location marker of the tracker.