nubse, the issue with estimating AoB is that you don't know the target's course. If you do know the target's course, there is no problem at all with getting the AoB.
So far, I have used the recognition book to help me estimate the AoB with pretty accurate results. Look for certain features on the superstructure that will help you out. Also, if you're having difficulty, wait until the AoB more closely matches the next higher angle in the recognition book before making your estimate. All this is assuming that you're in front of your target.
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