I play stock, 1.4.
Don't the Japanese ships show up in grey and stay that way until you actually see them? That's the way it seems to me. The grey maybe was there because he had picked them up on sonar/radar only. If you sink them without actually having a visual contact would't they remain grey?
As to friendy vessels I seem to get blue right away regardless of actually seeing them or not. A bit of a giveaway really as you don't have to ID them as to attack or not as you would have had to do in RL.
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