Smoke
Wouldn't it be great if they had taken one idea from an old game called Up Periscope? In that game you would get the remark from lookouts "Smoke on the horizon sir, bearing..."
That is realism!
So, without that, make sure your bridge crew are the best men, and keep a good one on those hydrophones. (Yourself, if you can stand it)
If you make notes about where the reported sightings are, and where you contacted ships. These locations probably are on a path used frequently - so go there often.
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