I personally own a Garmin 60CS. It's a great general purpose GPS useable for hiking, in the car, on the boat, etc...
It's a bit pricy, but does have alot of features.
In the troop, I usually carry it on hikes, again mostly so we have an exact position, and afterward we can figure out things like exactly how far we walked, climbed, etc....
We also do some Geocaching sometimes when we're on campouts, and others will bring along thier GPS units for that.
Vernon L. Palango
Scoutmaster, Troop 131
The best progress is made in those Troops where power and responsibility are really put into the hands of the Patrol Leaders.
-Lord Baden-Powell, Aids to Scoutmastership