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An iPad has no GPS at all and won't allow connecting to an external Bluetooth GPS as well. This is a limitation of iOS.
The so-called 'GPS' is actually A-GPS from the locations of the Wifi hotspots collected by Google or obtained by triangulation of the GSM posts in case of 3G.
That is one of the reasons I sold my iPad and now use a Samsung Galaxy S2 which works fine with an external GPS. The internal GPS of it is rather poor but still works for car navigation.
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