I don't think a continuous use of ASDIC is a useful tactic for detecting subs that are not previously located in a more or less accurate position, but it certainly warns them about the convoy being escorted and makes it more frightening to search for a hole in the screen. It's like an animal that inflates itself and yells when menaced...it tries to look bigger and scarier than it is in reality.
From what I have read about japanese escorts in WW2 it is true that ASDIC -when available- was not always turned on. It was far more usual in both japanese and allied ASW vessels to do stop-and-run tactics, by steaming at high speed forward, then stopping machines and listening with passive for a while.
Anyway it seems that approaching a japanese convoys was relatively easier than doing so to an allied one, due to worser ASW training and tactics.
:hmm:
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One day I will return to sea ...
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