With a 90 degree attack, that is, your sub is crossing the target course at 90 degrees, your AOB should be set to 90 degrees.
First, set your scope at bearing 000. If your sub is to the right of the enemy's course, then you use 90 AOB starboard. If your sub is to the left of the enemy's course, then you use 90 AOB port.
Then, turn your periscope from 000 towards the target until your gyro angles read zero. If they go the wrong way, you have your AOB set to port when it should be starboard, or vice versa.
You should have to "lead the target" about 10-15 degrees away from 000 with gyro angle zero, depending on the speed setting for your torpedo.
Your torpedoes should not turn at all, as you are shooting with gyro angle zero.
Range to target is irrelevant with this attack method. Only speed matters.
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