I've read of hydrophone detection ranges of up to 100km, however, I suspect that related to the explosion of depth-charges or torpedoes. However, as it may reasonably be inferred that dc's and torpedoes exploding are in the region of the convoy, that would give a position line if not the location. Frankly I don't know the hydrophone range for detecting a full convoy, but I have to think it'd be considerably further than 10km, and probably 50km at least with a quiet U-boat?
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