You should look at the free app called ViewRanger GPS it has a green symbol, with a bike and hiker. That program on my smart phone is the best ! I have a Garmin vista gps and it stays home now because the ViewRanger is the ticket. You can pay 15 $ or so and get a map upgrade, but after that, you have satellite as well as topo maps of everywhere. Before you leave home to hunt an area, you can just download and save a section or map area of your hunt and then it will be on your phone. It uses Satellite to track you and does everything a good gps will do. I marked where I shot my elk last year and then found my way to camp in the dark. It keeps track of everything, elevation gain, distance and makes your track for you. All you need is a way to charge your phone on the Mtn. I have a charger that works for 4 full charges and it lasts me almost a week at a time. take a look, a friend turned me onto it and I am so glad to use it.
Now my phone does it all, my ballistics program (Strelok), GPs (viewranger), camera, and I can text and call home from some parts of the mountain I hunt. All in one unit.