The hyrophone is not only on the keel have ever seen that thing on your port bow that spins? That is passive sonar for the deck and those balls at the bottom are transducers for the acitve sonar.
They sweep on thier own but they will only report a conact inside the "range" of the set you have at the time so if you listen yourself you may vaguely hear something the game wont alert you about.
The game is funny about the soundman giving updates though often you must keep clicking the tab that tells him to report nearst contact.
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