Go ahead and take a map.
Be sure someone knows the planned route. SAR has been all too busy lately. The offroad conditions can go from bad to worse in a hurry this time of year. Something as simple as the frost going out can turn a passable road into an impassible gooey mess. This is a big country to go looking looking for a single vehicle.
Have a plan and be safe. It is lots more fun
Heck, time spent around the map planning the exploration is half the fun!
Pick up a Benchmark Maps Roads and Recreation Atlas. (Made in Oregon) They are very good for Oregon and Idaho.
See ya...out there.