I am thinking about picking up the iPad2 and am not sure if I should be getting the Wi-Fi only or 3G version. I would like to be able to look up location information on the iPad, even though I will have my iPhone with me. Sometimes, the iPhone map is too small to see while driving. If I buy the Wi-Fi only version, will it still be able to access GPS information on my iPhone through tethering? Will it be able to pull up and update maps through tethering? Or, will I need to get the 3G version to properly access location information and update maps? In any case, I don't plan to subscribe to 3G services just for the iPad. Thanks in advance.