I just downloaded GPS MotionX on my iPhone. It's not hunting specific but you can view satelite images of your hunting area and save locations or routes. I plan to mark scrapes, rubs, trails; things like that. Not sure how it will work just yet, but going to give it a try. The only problem with it is, the area I hunt doesn't have very good cell phone coverage so it takes a while to load. I think the app was $2.99.