Does anyone know of an application that will run GPS off-line? I am an avid hiker and can not utalize the maps feature wihtout a signal. I have been using Tracks and MotionX (both paid versions). Tracks is great because its possible to downlaod maps and waypoints from other users and sites but dependant on Internet... Motion X is great but no signal no map. Any advice? US Park Maps is a great example but it only has US National Park Maps.