128 or 256 in enemy controlled waters, 512 in friendly areas (east of Denmark while exiting Kiel, for example).
As for other "quirky odd things" - I used to keep the "score" for all crew members: I noted a point next to crewman's name every time he's done something worth rewarding: spotted a plane in time, warned me of an enemy destroyer, fixed dangerous damage, kept machines running when all other sailors in the room passed out, etc. Upon returning to base I used this score to decide who gets the most tasty medals.
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