Bad Captain,
They are radio intercepts either from your own direction finder or BDU intercepts of single ships (some times it's one ship, sometimes more) sending position reports or requesting course information.
They are there alright. Get their course and draw a line on the map and plot a interception route. When you get to the point where you think you might be fairly close submerge at low speed and pick them up on your sonar. They may be little off from what you plotted. Then try to get a periscope fix on it (them) and draw a line on their true course. Then go get'em.
I get far more kills that way than just blundering into a single ships.
Good Hunting,
David I
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