This is the longest hike on which I have used GAIA GPS program and am rather impressed with it. You can download the map then turn off the cell phone data which will conserve battery and then get a moment by moment up date on your progress. We were easily able to stay on the trail despite a fair amount of snow in places. I put captions with the pictures but they did not come across. Not sure how to correct that if it is possible. This was a fairly strenuous hike with a gain and loss of ~ 2500 feet and total milage 11.4. We didn't break any landspeed records. Myra has a fanny pack under her coat. Her osteoporosis isn't that bad yet!