Nice bits of kit, but crap in cover - never trust your life to one! As has been said repeatedly, learn map & compass skills and work out your pacing until you can do it in your sleep, then carry the GPS as a backup.
Too many people have got into serious trouble relying on GPS. Besides, the false sense of security they bring tends to bring out the worst sort of people into the cuds. A bit like the effect AOL had on the Internet!