I've been toying with the idea of adding a basic GPS unit to my kit, primarily to answer the question, "Where am I right now?". I don't see GPS overtaking my normal navigation skills, but I though it might be useful. I'm thinking of something along the lines of a Garmin Foretrex 101, as it's small and runs on AAA batteries and seems to provide what I'm looking for, but I don't want to waste money on a device that's not all its cracked up to be. Any advice/opinions?