If you get a contact report from the sonarman, you need to lock on the target by selecting "follow nearest target" right after he first detects it. If you wait he will continue sweeping, and will come back, no target detected".
So you then need to go into the sonar position yourself and move the hydophone to the target and then ask the sonar to follow nearest target. THen ask for the range or ping it yourself. It could also be that it's too far away to get the range yet with the sonar, and he's only picking his sound up with the hydrophones.
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