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In addition to the PLB I mentioned above, I ALWAYS carry a GPS. I get out of the vehicle, turn it on, wait till it becomes active and mark the vehicle location. Then, leaving it on, I replace it in its belt pouch. Works just fine there.
I have been hiking these Maine woods for over 40 years now. Everyplace still looks like everyplace else. Very easy to get a bit disoriented and walk the wrong way.
After years of doing this, I have a very good idea about where the GPS will work and where it won't.
It is not the only navigation aid I carry, but I always carry it. Like the PLB, it gives great comfort should I need it. And because I am sure Murphy lives in these woods, having the track back to the car is always appreciated. Especially if I have to give the GPS to someone else so they can get back to my vehicle (with its company radio, parked in a spot that will hit our repeater) to summon assistance.
Nomad