It's cool. Your explanation is very helpful for that operation. The truth is that I know nothing but what others say. In this case AOB is strictly as I described, and can be best understood with the tutorial I linked.

On the other hand I have no idea why AOB is done that way, or why entering it into the TDC makes the torpedoes do what they do. I just read what the experts said, and believed them. :sunny:

The TDC is an Angle solver.... putting in target Speed, AOB, and Distance will solve that angle the Torpedo needs (gyro angle) to turn after leaving the tube to impact the target given the current speed and direction of your uboat and assuming your optical device (periscope or UZO) is pointed at the target (since they are part of the TDC).

AOB is important because once you have the targets speed....and to a lesser extent distance....the current AOB basically solves for the course of the ship. ..and therefore can compute an intercept angle...or gyro angle. Distance only matters because the torpedo can't turn immediately once leaving tube (it has to go x distance before turning) therefore the gyro angle will be different depending on a couple of factors. One is the angle you shoot your torpedoes at....and the other is how close the target is too you.