Just be forewarned: You might get dreamy-eyed yahoos who are utterly convinced they know where treasure-laden shipwrecks are. Be scrutinizing of their "proofs". If it becomes "someone who told someone who told someone who told someone" type nonsense, then .... save your time. Or someone who's wand pointed a certain direction. Or someone who solved a cryptogram, or got a map off the back of a Capt'n Crunch box, etc....