Investing in a good GPS unit, and a chip for the state you're hunting, has been extremely helpful for me and well worth the $$. I would rank it right up there with a range finder in importance for your gear list. I hunt with my Dad and his old timer buddies, who's gear list is fairly limited to gun, bullets, binoculars. So I can say that I wasn't raised to covet the latest in hunting technology. But on a trip to Colorado recently as we were scouting for an upcoming hunt I was able to pinpoint public land as we drove along in an area none of us had ever been before or knew. It gave us total confidence in where we were at all times and erased any concerns that we might be wasting our time glassing an area we "think" might be private.