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Btw in German AOB is not Kurswinkel. We call it "Lagewinkel".
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On OLC's request, here's the explanation:
Lagenwinkel is the AOB in the torpedo firing triangle, while Kurswinkel is the AOB in the triangle represented by the two ships course (Own ship and enemy ship). The two ships triangle is used to calculate the speed and course of the enemy vessel, whereas the torpedo firing triangle is used to calculate the torpedo lead angle or "Vorhalt".
Both triangles have one corner (angle) in common: The AOB, but the other corners (angles) will only match if you are shooting with zero Gyro Angle (Straight from the bow).
The TDC calculates the Torpedo firing triangle and gives the Gyro Angle as solution. Our AOB wheel does not calculate anything related to the firing solution, but since the target course angle also serves for that solution we can take it straight.
