For my SxS I use the Apple Ipad mini. If you go with the Ipad, make sure you buy one with wifi + cellular. Cellular is needed to get the gps chip. I use GAIA GPS for the trail tracking system. They have a free version but their best program will cost about $59 per year. I first tried using the Garmin Overlander unit with their trail system before I went to Gaia. For me, Garmin couldn't compare with Gaia.