If you're using contact map updates and don't mind "cheating" a bit you can use the the protractor in the nav map to check the AoB. just check the angle between the sub and the bearing of the target ship from the ships position and then enter it. Another way is if your on a 90 degree intercept course you can estimate the AoB from the targets position. So if you have the target at about 45/315 degrees you have an AoB of about 45, at 10/350 80 and at 0 90. not perfect but works good enough on short ranges. and lots of practice. Hope that helps
