I think this illustrates well why the Germans stopped transiting at night in the Bay of Biscay, IIRC. This originally applied to boats traveling on the surface, but with cm radar equipped a/c - well, you get the point.
At least during the day they had a fighting chance of seeing the a/c. Can you imagine how tedious it must have been to stare into the obs scope for hours on end, looking for an incoming Sunderland?
Jesus...
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