The technical specs as listed by Apple provide a good starting point: The "Wi-Fi" versions of the iPad 2, which come in 16, 32, and 64GB-memory models, do not have built in GPS chips. One cause of confusion is the fact that the Wi-Fi models can determine your location fairly accurately, as long as they are within range of a Wi-Fi signal, thanks to their Wi-Fi positioning capability. The Wi-Fi models also have a built-in digital compass.
The iPad 2 Wi-Fi + 3G models do have built-in GPS chips that receive signals from the global GPS satellite system to determine your location - as closely as three meters, depending the the number of satellite signals the chip is receiving. GPS in the iPad 2 is classed as assisted GPS, also known as AGPS, which enhances the performance of standard GPS in devices connected to Wi-Fi or the cellular network. The iPad 2 W-Fi + 3G may be used for the full range of apps that require detailed location information wherever you may be on the planet, including mapping, driving, services locators, and more.
Info sacada de:
http://gps.about.com/b/2011/03/20/ap...pabilities.htm
Y el iPad si se puede usar como GPS, lo he usado, lo he visto con mis propios ojos y hecho las pruebas sin absolutamente niuna conexion de datos en el ipad, y funciona.
My two cents.
Saludos