I always gave much more effort in estimating a proper target speed, then a proper target AOB. Missing the correct AOB within 15 degrees to either side wont make much of a difference, whereas incorrectly inputing one extra knot will sure account for a miss.
So if you are in a tight spot and do not have much time to be guessing every single info on the target's vector, just do a rough AOB and waste your valuable seconds on distance and speed.
Sure, if you have lots of time, you can have fun with any of the various perfect-aob-guessing methods. But then, if you do, probably you also have time to camly plot an attack. If it is the case, you can manage to squeeze in into an ahead position, there the target "crosses your T". Beingin a 90 degrees lateral angle is the single most perfect firing position you can get - and in this position, a slightly-wrong AOB wont make much of a difference.
At least this is how I do it 99% of times.
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