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Originally Posted by Russic
Actually I believe it does both (referred to as "assisted GPS"). You are correct in that you run into problems when the cell signal disappears. You can actually get a gps fix on your location, but if your app requires a connection to load the map (google maps, GPS Drive), you'll only get the blue dot and no map. If your app has maps preloaded though (TomTom, Navigon etc.) it will still work. Mine worked all through the rockies when there was no cell signal.
You are right about traveling in the states though. Sure don't want to be roaming data down there.
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My understanding is there isn't data roaming charges with the Navigon app in the States. The maps are stored internally and it is just using cell towers to triangulate your position...not actually downloading any data.