If you have map contacts on then you'll get a line that fades out in the direction of the enemy escort that represents the sonar contact. You can ask your sonar operator to follow the nearest warship, too. He'll then continuously call out the ships bearing, speed, etc. What you do from this is up to you. It's quite challenging to stay in the control room and try to visualise in your head what is happening, just as I imagine the real Kaleuns had to do.
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