I have noticed that after attacking a convoy, the IJN DDs will occasionally stop, sit and listen, causing their associated blue azimuth/range lines to disappear from the plotting board..
Since their engines aren't running and making noise, the hydrophones have nothing to hear and nothing to display...
This can be very embarrassing if the DDs tactic goes unnoticed, as the sub Skipper thinks it's all clear and starts making noise to get away only to attract some unwanted attention...
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