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Yes, Jamie is correct, the cellular models of the ipad have a stand alone GPS receiver in them....so if you use a stand alone, or offline GPS software system, you do not need a cell signal. Google maps is designed to use a cell signal, so it does not have to download all the maps onto your iphone or Ipad.
I have pulled the trigger as we speak on the Rand McNally Ipad app.....huge download, as it is downloading all the maps, and essentially it becomes like the stand alone GPS on your dash.
Will up date you guys how it works, but I do not have any long trips planned yet. Gonnna use it around town in the car though!
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