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In principle not (with preloaded maps).
But with it you will have a faster start with the GPS signal
Or if you want to use the traffic info.
EDIT: And of course, with Google Maps navigation you must have a data connection.
Harry
thank you
might take a trip to texas next week, and just check the sprint coverage, and i should have 3g the whole way there
The GPS receiver doesn't. As for the GPS app -- depends on the app.do you need a 3g connection for the gps/navigation to work?