I've found a few, and also couldn't find one. It's a good excuse to go for a hike. For survival skills, it might be more valuable to do it without a GPS, and just use a topo map and compass. If I do it more, I'm going to train my dog to help sniff it out. I'm sure with a little practice, she'll figure out the game and will detect the scent trail of other visitors and go right to it.
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Benton