The problem with a cell or tablet is there is almost no coverage and if you did not get the maps downloaded properly you will be in for a surprise. In addition if you get turned around (aka lost) you may not be able to depend on a cell or table to guide you out. I use a Garmin GPS that I load with custom waypoints from a program on my laptop. I also carry maps and a compass as backup. My issue is that the Garmin (when on the trail) is not always bright enough to follow the trail. While you can see the trail on the screen you may need to listen to it complain about turning around. I generally just turn of the volume and keep driving. A lot of times it wants to go back to hardtop to figure out the next point. Another advantage of a GPS is you can just tell it to go home, campsite, etc. and it will help you find your way out. I have looked at the Magellan TRX but can't get past the price.