using google maps in the USA with phone

Soldato
Joined
5 Jun 2005
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Location
Southampton
gonna be doing a road trip in June across the deep south and kinda want a sat nav as back up. if i take my HTC desire out is the gps thing gonna need to use 3g to down info and therefore charge me? as i kinda wanna turn all that stuff off. was thinking of buys a paygo USA sim card?
 
yeah may aswell go halves on a satnav or as someone mentioned pay extra in the hire place..

just was not sure what was used data wise..

so am i correct in thinking....

a standard tomtom has the entire map of a country stored already, and google maps, downloads data via 3g as and when it needs it?
 
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