In really stormy seas, I was taking my boat into Gibralter (itself an utter failure, alas) in very stormy seas and three or four grey 'sunk ship' icons gradually placed themselves around. Nobody even knew I was there, to the best of my knowledge, the storm took 'em.
Not sure even why I got the grey icons, I never saw them to know what kinds of ships they were...only thing to know they were gone other than that was that they vanished off they hydrophone
