For what it's worth, I have a Garmin Nuvi that I just stick on the windsheild just like a car. I purchased maps from here
Appalachia ORV GPS Map - VVMapping.com
It has maps for Royal Blue, Windrock etc, and provides turn by turn directions just like you were using it in your car. Handy if you get lost, will tell you how to get back. It may send you down some black trails but you will get back