(Deleted convoluted AOB stuff that makes my head hurt.)
AOB is very easy. Forget the chart. AOB was done visually, on the first observation, in order to establish target course.
Look through the scope at the target's center of mass. Imagine a line from your eye through his hull. Half of the hull (that half with the bow) will be hanging off to the right, or left, of that line. Estimate the angle from your line to his hull--that's the AOB. If the hull is hanging off to the right it's a starboard AOB. To the left it's port. So bow-on is 0 AOB, his beam is 90 AOB, and his stern is 180 AOB. The ones in between you have to estimate. That's why the recognition manual shows you those nice angled shots.
AOB doesn't care about your course (it's inherent in your observation.) It doesn't concern speed. It doesn't matter if you're using a bow or stern tube.
You could be heading away from the target and his AOB might be port 90. Instantly turn your boat 180 degrees and it's still port 90. It's just the angle between his hull and the line-of-sight that connects you, plus port or starboard.
I don't know why people insist on measuring anything from the target back to the sub. That's just confusing.
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