If you have ever used a hand-held GPS or a vehicle GPS, you will notice that it is not spot on with respect to your exact location due to military built-in wobble (zone of error).  However, with the Map App on the Samsung Tablets with built-in GPS, the location IS SPOT ON.  For how long this will last, I guess depends on how the military will react to such 'features' of the Android tablet.

However, for now the recent generation of Samsung tablets that have GPS...are spot on.... even as you move.