Don't have a GPS suggestion for you, but thought I'd add this. I quit carrying a GPS couple years ago, since I was already carrying a smartphone. Smartphone apps can work just as good, if not better than a GPS and you've often got a larger screen. I've got a few different apps, but I like one called U.S. Topo Maps. It has multiple aerials, topos, terrain, and other maps on it. You just cache(store) the maps for your particular hunting area on your phone before going in the field. Then you don't need signal to still use them. Your phones communication with satellites still works without signal. You can mark waypoints, routes, etc...all the usually GPS stuff.