If the ship was bearing 150 to you, that probably lies within the 'dead zone' the sonarman seems programmed not to find anything in. I never get contacts reports in about a 40 to 60 degree cone about the aft, due to engine noise. Going to the hydrophone station and listening manually, it's fairly easy to pick out the sound of the enemy ship. I can only assume sonarman will not report contacts near engine noise, regardless of actual noise the hydrophones pick up.
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