One caveat; the programming for the game is designed to use one sensor and one sensor only at a time. So if you're on the surface in clear visibility and the lookouts can SEE the target, the sound man cannot HEAR the target. Foggy weather you're more likely to get a sound contact because the deck watch can't see it. The whole thing is completely screwed up, but if you're playing with map contact updates on, you should be able to see the blue or black lines indicating a sound contact up to 10 miles away. On the sonar station itself if you rotate the indicator the green lamp should light up and you'll hear the propeller noise within 10 degrees of the bearing, if the target is moving at 5 knots or better. A stationary target or one creeping along at 1 knot (the small troopship "task force" does that a lot) won't show a green light or make any sound, or show bearing lines on the map.
BTW this is stock SH4 1.4 I'm talking about, I have no idea what was changed in various gameplay mods, depending on what mods you have installed and in what order the sonar might not work the same way.
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