From the last time I was at the sonar station I had trouble hearing anything in the last 20 deg range from 180, so if your contact is 160-200 you will not hear it. In fact it will be an abrupt signal loss at the edge.
If your sonar guy can hear it you most definitely should be able to. What bearing are they calling? I always slow sweep the entire sound circle all 320 degrees and listen. If your setup is like mine you should hear things along a 5-10 degree chunk and the loudest in the middle of that chunk.
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