Hatfield Mccoy & Outlaw Trail. What GPS System?

Can someone help me out with what GPS I need to navigate the Hatfield McCoy and outlaw trail system? We were up there this weekend and two of the guys had downloaded maps on their tablets but they would not keep up. They constantly lost signal and were very frustrating. I am looking for a system that give turn by turn directions to a way point. Basically I want to be able to ride all day and when I get tired hit the Home point and it take me there.
Thanks
Guy