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If you want to use gps  there are constantly  upgraded Oil service and logging road not found on regular maps. These can be bought and dl into your  gps no way to mark on a map  unless you have a plotter printer due to size of area. i get them through surveyor friends they also have nice things like mineral deposits  elevation cross sections, water sources (including tidal pools with time they spring forth) learn them mark them which season they are passable. carry a cb radio for updates and any closures.

If you know the road you can even  find fuel reserves if you know what to look for. These roads can not be done in a city  vehicle you should have a 4×4 with chains and winch.