Wilkommen an Bord, Krumski!
When speaking of hydrophone, you'll have to keep in mind that your hydrophone operator should have a hearing aid since he - even if experienced - can only detect a target to at most 15-20 km, whereas you yourself hear a ship at a range of 30 km in favourable conditions. For that very reason don't forget what the manual says:
Quote:
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This possibility of using the hydrophone to help in detecting surf ships should, however, be restricted to those cases in which the submarine is unavoidably compelled to stay below the surface. The hydrophone must not lead to inactivity [passivity] underwater, which would be wrong; it is an auxiliary instrument and no more, and can never be a substitute for ocular perception and surface viewing. As soon as visibility allows, the place of the submarine is on the surface. Otherwise valuable opportunities of attack are lost.
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THE SUBMARINE COMMANDER'S HANDBOOK
Paragraph 28