I like the STOP approach.

It's good because it helps people to conserve body energy and to re-think their situation. I have to say that "stopping" can be pretty hard from a psychological point of view - because people have to admit to themself that they acrewed up. I'ts generally considered a "failure" if you get lost.

However - STOP doesn't work if there's nobody looking for you. Look at the story (on this thread) about the German family stranded in a remote part of Death Valley. Their bones weren't found for years. I think - if I remember right - that there was a search when they went missing. But it was too late and went in the wrong direction.

STOP is still a really good idea.
But may be it needs to be STOP and Signal.
Send a signal out to the world that you've got a problem.

Pete2