AOB stays the same. In both your examples, the other boat sees you at a bearing of 90**°, thus the AOB is 90. If the target is heading due east and you are due south of it, it's 90° starboard.
The TDC will take the bearing to target and range to target from your input to figure out where the target is, use the AOB and speed to calculate its course, and that's what it uses to continually update the solution through the position keeper. The bearing to target heavily influences the gyroangle of the torpedoes. If you're pointing directly at your target, they're going to have to turn a lot less than if you're on a parrallel course.
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