Don't trust your Hydrophone operator. Guy couldn't hear a brick dropped on the hull. Take a minute now and then to listen yourself, sometimes there are nice targets nearby that you don't get told about by the map/HQ.
As Pisces wrote, pay attention to the icons on the map that pop up. Just because one might be too far away to be worth it on Thursday doesn't mean it won't sail right in front of you on Friday if you've kept an eye on where it might be.
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