Цитата от(из) Seshan:

The iPhone uses a A-GPS, it needs cell towers to tell where it is, if the iPad does not have 3G in it, it can't tell where it is.

NO, NO, NO... A-GPS is REAL GPS that also can use cell towers to assist in finding a location quickly at startup or when the satellite signal is low. This is why an iPhone can find where you are magnitudes faster than most GPS devices in use for cars.

http://en.wikipedia.org/wiki/A-GPS