What you are talking about is setting up the periscope to 0 and AOB to 90 to synchronize them, as you are on a perpendicular course (in this particular case, you don't have to be 90 degrees in general). You first have to flip the auto-TDC switch to 0 (if I remember correctly, it might be the other state), then set up the periscope and AOB to a predicted situation when the target is right in front of the tubes (so 0 bearing and AOB 90, what it would have once there), then flip the AutoTDC back to 1. After that you can change the direction of the periscope anywhere and the AOB dial is changed in step. When you look at whatever angle with the scopes the TDC will calculate the proper gyro angle based on target speed, torpedo speed, range, target bearing according to the proper torpedo turn geometry. And if the speed is constant for all targets you can shoot at any of them in the convoy as long as a ship is visible (meaning not behind another) and the range is roughly correct.
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