theres alot of differerences. IE: the sprint and zombak is not real time like gpvector, also it doesnt work on googlemaps they have some second rate mapping system, and they dont track where you have been. and the sprint one is only accurate to a 1.5 mile radius, im useing it right now on my phone. the only problem is that im hopeing gtx is able to pull that customer base from the other second rate pls sysems.
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