Hi Alien
A 90 degree attack 360/0 periscope bearing to the targets course line (TCL) is AOB 90 degrees port or starboard known as a fast shoot.
The range is not important although a range still needs to be entered into the TDC.
Ideally you should be positioned not further than 1,000 metres away from the targets course line.
The targets speed is important along with the torpedo speed will setup your gyro angles firing position when both needles are pointing vertically.
This will be a number of degrees to the left or right of the periscopes 360/0 bearing.
Firing the torpedo as the target passes the periscopes cross hair will give you a high percentage of hits everytime.
Peter
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