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I don’t know if the specs have changed in this regard since the iPad1 (which is what I am still using) but the 3G model had better GPS functionality than the wifi only model, even when 3G wasn’t being used. In our family we have a wifi only iPad1 and a 3G iPad1 and the 3G model has always pinpointed its location more quickly and more accurately than the wifi only model, even when both are using the same wifi connection.