Do the iPhones, iPads & iPod Touches have GPS?
Yes – for those devices with a 3G (cellular) data plan, no for the iPod Touch & the iPads without the 3G ability. Here is an article that discusses whether the iDevice GPS is “authentic”.
http://www.zdnet.com/blog/apple/apple-ipad-does-it-have-real-gps-updated-yes-and-no/5898