Personally I ignore AOB and set it to 80. Get a few range and bearing marks, draw a line thru those, that's the target's track. Don't head for the target, head directly for the track since the idea is to be 1000 yards off the track at 90 degrees to the track when he gets to the firing point. While moving toward the track take another range and bearing, mark it on the chart, then use the stopwatch or measure out a mile, whatever's easiest for you to determine speed.
My experience with AOB is it's difficult to judge when you're where you're supposed to be, if you're on the track or just off it the AOB is gonna be somewhere between zero and 10 and won't change much until he gets really close, then it will increase rapidly as he crosses your tubes. That's why I set it at 80 and leave it, since that's about what it will be when he hits the firing point. You really wanna use the TDC to keep track you can measure the angle between your sub's heading and the target's course from his current position, that will give you the most accurate AOB.
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