The app is free, but you have to buy a subscription for all the goodies. There is a free trial period included for a month, I think, so you can try it out without shelling out the big bucks. Subscription costs $25 for 3 months or $75 for a year. The GPS in the iPad is lousy, but it doesn't need a cell signal to work. If you have the wi-fi only model, there is no GPS chip in it, from what I understand. I have the 3G model, but went ahead and bought a separate battery powered bluetooth GPS receiver that provides a much better signal to the app. Fortunately, the receiver works with all GPS enabled apps on any Apple device (or even a laptop with bluetooth), so I can use it for more than just flying.