Another point regarding why a discussion of the Garmin Foretrex GPS is relevant to the tourist or casual camper who walks off and gets lost... The Garmin Foretrex is worn like a watch and in one mode depending n how you set it up, it is just a watch. If you go to "SETUP" and select "SYSTEM", it takes you to a page showing "GPS MODE"; put the mode in "OFF" and you turn off the GPS receiver so the unit is just a watch and the battery lasts longer.

So you are going on a hike and using the GPS as a GPS, you mark your parked car as a waypoint, or while camping you get to camp and you mark the camp as a waypoint -- then you page through the functions and turn off the GPS, page over and down the page, and all you see is the TIME being displayed. There are options to change the fields displayed and that's how mine is set; time shows in 24 hour mode. In any case, it's just a watch until I need it to be a GPS again.