(sorry for the OT Larry) Keith, I have no expertise in the type of GPS and maps you would be needing for treking off-road. Others may know more than me - nearly everyone does. 
Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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