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Originally Posted by Platapus
So you telling me that my AoB is not just the reciprocal of my bearing?
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Actually, it's not AoB you need to worry about ... exactly. It's target track. With the O'Kane method, you want the target to cross your bow with an AoB of 90 degrees. The easiest way to do that is to position you sub perpendicular to the target's track (course line).
If you "pull lead" to optimise your gyro angle, you need to take care that you don't, at the same time, skew the AoB (check target heading on the TDC to be sure) . Whether you align your crosshairs with your bow or adjust them to lead the target, the target still needs to be at 90 AoB when it crosses your bow. (With a proper lead, you will fire prior to the target crossing your bow such that the torpedo impacts the target exactly as it crosses.)