A quck AP tale. Of few years back. some guys I know set off out of Fal on a dive trip. A mile or so off, they saw a small yacht with flogging sails. They headed over to check that all was well. On coming 'longside, they saw a guy in the cockpit looking slightly bemused.
Turned out that he'd bought the the yacht in Fal, motored it out into the Bay, gotton some sails up, dialed Plymouth into the AP and sat there waiting for Plymouth to appear. He had no idea how to sail.
A couple of the dive boys hopped onboard and took the boat back in to Fal.