Tinman
iPF Noob
If you are jailbroken you can use just about any bluetooth GPS receiver if you use the app BTStack GPS (it's $5). I can get a GPS receiver that will work with this combo for as little as $25.Thanks to apple locking down of the OS you can not just go buy any blue tooth GPS receiver and expect it to work with a Ipad. There are currently 3 external GPS units that will work with an Ipad and they all cost about $100.00 each
One advantage to using an external GPS unit is you can position it for to better see the sky.
Michael