If you know 90, 180, 270 and 360 (0), it's easy to approximate the bearing with the naked eye, relative to the conning tower, then use the binoculars. That's the way to do it in the real world, and it works fine in the game world too.
I do have one question, though: In your diagram you have 330 and 340 on the left, but on the right you have 18 and 24, rather than 20 and 30. Why is that?
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