Forgot to mention:
AFAIK, while the Japanese merchants have hydrophones, they do not have active sonar. In other words, only the destroyers will ping you. I'm not sure if any of the capital ships can either.
I remember reading somewhere that one of the Japanese carriers was actually outfitted with a hydrophone set and a pair of depth charge racks for defense. I don't know if this was ever actually used in real life (I doubt it) or if it was ever implemented in the sim or not.
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