SD Radar.
As far as I am aware the early Sd Radar,"Air Search", could only give a 6 mile coverage around the boat, so a 250 m.p.h. flying boat could cover that distance in less that two minutes, even with the improved unit there was still the problem of low flying aircraft not being detected. So it would be not uncommon for a Sub to be surprised by an Aircraft. Good luck with the story, if you have a part can I play the ships baker? Doughnuts Ahoy!
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