I think Fred may be right! I use RFB plus RSRD, and have noticed that late in the war the Japanese deploy what could be considered a "Hunter/Killer" group. It consists of at least 2 Destroyers and a Cruiser that can either detect Radar emissions, or has Radar itself. I was stalking such a group, barely visible on the horizon, when the units abruptly changed course and made a mad dash in my direction! I crash dived and heard pinging not long after. There was no way they could have visually seen me.
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