Get to about 1000 yards from the target
It doesn't matter whether the AOB is exactly 90 or not - just make sure it is about 90.
The speed is the most critical estimate
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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