Seen something similar recently during my current patrol. I was approaching a Coal Carrier in heavy seas when suddenly my crew started celebrating a sinking and a red sunk ship icon appeared on the map. Never fired anything at it and it wasn't recorded in my log. Perhaps another u-boat got it. Couple of hours later I saw a large trawler succumb to the weather, this time though a grey sunk ship icon appeared on the map but no crew celebration to go with it.
Nemo
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"I'm afraid there is no disguising the fact that King's obsession with the Pacific and the Battle of Washington cost us dear in the Battle of the Atlantic".
Sir John Slessor GCB, DSO, MC, DL
AOC-in-C Coastal Command RAF
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