Nibelung

[meduza]

Originally Posted by Sea Hawk

AOB = 180 - (TB + differance between the headings)

That's the formula, but it's not that simple as it doesn't cover all situations.

Knowing the difference between headings (i.e. your heading - ship's heading) is sometimes not enough, because we need the angle between them. To get the angle we sometimes must subtract that difference from 360, or 180.

And if the AOB is greater than 90, i.e. the ship is moving away, the result given by the formula must be subtracted from 180 to get correct AOB.