If you need a gps, you also need a compass, and maybe a paper map to boot.
Was exploring a small WMA a couple years back and wanted to compare what my brain told me with what the gps thought. The gps in my "smart" phone said I was standing in the Shenandoah River, which was about a mile away.
The little Backtrackers Bushnell makes are cheap and, if you remember to set them before you leave your starting point, will get you back there. So far, knock on wood, mine has been spot on. It also works as an electronic compass, but I still carry a real one.
