if you know the targets course.. setting AOB is trivial.
just set the AOB dial to what it looks like at that scope bearing, and send it. then look at where the 0 on the target's "inner" dial is pointing at on the outer dial. it should be pointing at the target's course. (note: you need to send atleat one range/bearing before mucking with it's AOB)
so say you know the target is on a true course of 200 degrees. when you set the AOB the 0 on the inner dial should be pointing at 20 on the outer dial. if it's not, then adjust the AOB slightly and send it again until it's pointing at 20.
later on when the taret is closer, you may get alittle "AOB" drift when sending a new bearing/range. just adjust the AOB again until it's pointing at 20. if after multiple range/bearing readings (over a period of time) the AOB does not drift, you proably have his true course set correctly.
hope that made sense.
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