Electronic Crumb Trail
So, is a GPS any good at all without a map? Yes. If you move with your GPS switched on, it will keep track of your progress, leaving an electronic trail of crumbs. Before leaving camp, you can create a waypoint and name it "camp." As you travel, you can continue creating and naming waypoints. Then when you want to return to camp, you simply choose the waypoint from the menu and follow the GPS.