Sonar in the game is way oversimplified, but if they made it realistic it would practically be a stand alone game. In SH4;
Leadership
Electrical
Mechanical
Guns
Watchman
There's nothing in the skills for sound, I would assume it's electrical, or possibly electrical skill combined with watchman skill. You could try finding men with high ratings in those two skills, see if they do better than average.
If you can hear something the AI crewman can't, or the green light comes on when pointed at a specific bearing, turn to that bearing, bend on some knots, and see if a target does become audible.
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