I weirdly don't find this creepy, and I don't know why. Perhaps it's because the terrain is difficult and it's very perfect timing, but not creepy?
Before I read it, I thought it was going to be some deserted island and a living person, who wasn't them, made it for them. Kinda like a "get off my island" type deal, but creepy because they didn't know a living person was nearby, which could've been bad.
But instead it's just lost people get lost close to a place where someone got lost previously, and it just so happens a helicopter flew by and saw the sign from the previous person.