Thanks for all the help. I'm getting the hang of it a little bit, but only on short range <1000. Guess I'll practice some more.
The trouble I had might have been that I wasn't full stop when doing my targeting. Should have thought of that myself..
@desirableroasted; you didn't read me wrong entirely I think.
The gyro is the amount of turn the torpedo will have to make to hit the target, the AoB is your position vs targets position. My point was that the ideal AoB (perpendicular) already translates into the ideal gyro (around 0 degrees). However this is only true for mechanic torpedos as you pointed out. I hadn't thought of the magnetic torpedos. I'm only still in '40 so not using magnetic ones yet