GPS is the way to go!!
at first I used to laugh at the techno hunter, I used to go out w/ a T, Blue jeans, and a gun and take game. BUT I keep a GPS on me now as part of standard gear...
When it really works is when you are in marsh and duck hunting all day. and you have been walking all day, retrieving birds, and are beat, and sun is going down, and all the cat tails look the same.. With the GPS you know where you are, exactly where the truck is, and the fastest way back, and your tracks you used to come in ( where the road is )..
2 things to note.. 1) I got a water proof / rugged version. I got the mono screen but I suppose color could be nice also. and 2) TURN OFF SOUNDS.. lol last thing you need is to be tracking deer, or anything, and have the silly thing going *Beep* on you.
also when you are deer hunting.. they are so nice.. you know where camp is, truck is, where you shot from, can re-trace steps. and know where you took shot, and use it to track game after the kill.. also they are so nice when you travel you know where food is, gas is, and can find things fast. I got a Garmin, but I am sure others are nice too. I just know I DO NOT hunt with out one now. When Duck hunting it can slip in your blind bag, or a coat pocket, and no one can see it. no one can hear it when you keep audio off, and you will know it is worth every penny when you know that camp is 250 yards north, instead of climbing a hill or a tree to figure out where you are. or walk around aimlessly..