I am not sure how the courses are set, some of them are most likely random. But I can tell you this much. If you always take the nearest 5, meaning 270 if 272 or 285 if 284 then you'll always be on the safe side in case you're using it for torpedo aiming. 2 or 3 degrees never made me miss a ship. The difference in aiming angle simply isn't big enough. Even 10 degrees would probably not make you miss the ship if it was traveling at under 15 knots and you're in the 3000m firing radius, even if you're in a 90° position to it.
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