For a modest cost buy a Garmin 62, if you can find one, or Garmin 64, go to GPS City for cost
For bigger and better they have that also
Trail maps are best at VV Mapping.
Comes on a SD card, plug it in, no programming, make some simple toggles on the GPS and hit the throttle.
Your limits are the batteries, AA's - keep it cold, your limited, keep it warm and (4) AA's will last a long weekend. Lithium are much better.
It will show you where you are On/Off trail, and you relationship to trails.
Do you have old Garmin Nuvi? If you are thrifty (like I am) use that. Bigger screen than a HH, Nuvi has draw backs, but can be cheap, real cheap.
VV Mapping, consider no other