[maerean_m]

Back in WWII, the spread angle had different meaning for the Germans and the Americans (as their TDC did not function 100% in the same way).

The Germans did not have the Position Keeper while the Americans could not launch salvo (multiple) torpedo shots.

For the Germans, the spread angle is how wide apart do the torpedoes run in a multiple torpedo shot.
For the Americans, the spread angle is how much the current torpedo should deviate from the gyro angle that was computed for the last shot.

So the user interface in the game is different, to emphasize that the TDC is also different.