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Anyways, here is my question: In the German subs, if I 'lock' the periscope to the targeting computer, and I turn the periscope, the AOB changes with the heading the scope is pointing.. this makes me crazy.. Should it be this way?
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Yes it is, that's how it worked historically.
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It's my understanding that AOB is angle on bow of my sub, not angle on periscope heading..
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No, it isn't (unless you simply worded it wrong)
The AOB is the angle between your line of sight to the enemy ship and his bow. Or, if you prefer it, when you are looking directly at your target, how much his bow is angled left or right.
This is one of the corners of the "firing triangle", the other ones being your own sub, and the last is the point where both his track and yours cross.
Since any triangle's angles added together always -always- are 180º, it is of pure logic that one angle can only grow at the expense of another diminishing. The german TDC takes advantage of this principle, and hence allows you to follow the target with your scope while the AOB of the enemy is constantly updated thanks to that principle.