Depends on ship's speed and type. I hear warships within 20 km if they run at 15 knots. For cargo ships at lower speed in bad weather I suspect you will hear them once they are at less than 8 km, not quite sure about.
Convoys can be heared at much higher ranges if more than 5 ships are in a group.
You are always better than your sonar man, so always go to the station if you suspect something is nearby. Sonar man will also not easily give you a range estimate unless enemy is very close, you must find out yourself, e.g. with the 4-Bearing method.
Last edited by XenonSurf; 02-13-18 at 06:52 AM.
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