in my experience, radar is only useful in zero visibility conditions, when you know that a single merchant is out there somewhere in the rain and fog but you can't see a thing
of course, those conditions often come with 15 m/s winds which means the early crappy radar gets switched off every time the boat takes a plunge in the waves.
and unless i'm wrong, in real life those conditions were regarded as too terrible for attack operations
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And when an 800-ton Uboat has you by the tits... you listen!
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