Good article, but a GPS by itself won't do squat if you don't use it before you get lost. I've got a mapping Garmin GPS V for my car and a non-mapping unit for hiking. Non-mapping GPS receivers such as my Geko 301 are small and less pricey, and can be used to mark where your car is parked, turnpoints and other features that will get you home. But you need to use it before you get lost.

Having a map with the GPS and knowing how to plot your UTM posit on the map is even better. But you still need to use it before you get lost. It's not like emergency gear that you only break out when you're in trouble. It's gear to use every time you go for a walk. Staying found is much better than getting found.

Mapping models are better, but they're usually bigger, cost more and you still need to know where you want to go on that map relative to where it shows you to be. Without terrain features (topo map in the GPS), it might be better to mark waypoints like you need to do with a non-mapping GPS rcvr. $.02