Not an expert here by any measure....but this is what I usually do.
If you have a plot line for the target's course just use the angle tool on the map. It takes three clicks. The first one is just out in front of your target along its course, the second click is at the bow of the target ship. The third click is back on your sub. The angle displayed should be the AOB value, then you just need to notice whether his port or starboard is presenting to you and Yahtzee. Pretty quick and painless if you have a good idea of the target's course and has been working well for me.
-happy hunting
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