I don't own an iphone but i have friends who bring them along all the time. Short answer is yes - The GPS and maps work in the middle of nowhere. We used an iphone for our GPS on a sheep hunt in the Brooks range and routinely use them on Elk hunts on Afognak Island (the phone part of the iphones does not work in either locations). My friends do comment about battery power but as far as I'm concerned I think the iphone made the stand alone GPS obsolete. Patrick
