First off was this contact between 340 - 20 degrees? Or 160 -200 degrees? If so your hydros wouldn't pick it up. That you can hear it is unrealistic, so if you want total realism - don't listen to those ranges. (This depends on your hydro, of course. Later models had more complete coverage.
If it's what I'm thinking about - asking the hydro guy to track a target and give updates on it - then having him not do that happens. Even to the point where if you just ask for nearest contact he'll tell you, but ask him to track it and you get nothing. I just live with this. No big whoop.
Also, as far as you hearing it - and someone correct me if I'm wrong - you can hear ships yourself beyond what is realistic. So if you want total realism - don't listen for single contacts 30,000m away
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