Well, the trouble with me is, a compass wouldn't do me a bit of good, because after a few loops and turns, I no longer know which direction 'camp' is. :~D I just have to stick to the trail and know where it's going.
I'm not well versed on the GPS unit, ecurbh is. But I'd like to be. What would be nice about it is if we have trouble and a horse or rider gets hurt, or if we come upon someone else up there who needs help, we can call someone and be able to give exact coordinates to where we are... OR, alternately, at least to the nearest intersection with a logging road, if we mark them with the numbers of all those logging roads. Without GPS, I'd just have to try to say "Well, we're on the Waddell Loop, about a ways past that turny part, before you get to that big white rock." Which isn't going to mean much to a guy on the phone.
The precise location aspect is what I like, I know where I am on the aerial photograph, but no one else does (except in a general sense-OB's out on the XYZ alignment). I carry the cell phone when I'm in the field, otherwise it's in the vehicle. Though it isn't on unless I'm calling someone. :-)