using ipad for navigation

Even if you add GPS to your ipad, where will it get the map data? Do you have a MiFi / Hotspot already, or will you be using an offline map program? Google used to let you download large segments of their maps, but they have eliminated that feature.

Here is a wireless GPS receiver that will connect to your ipad:

http://www.amazon.com/Dual-Electronics-XGPS150A-Universal-Bluetooth/dp/B006M49G80/ref=dp_ob_title_ce