Good walkthrough! I too have used this 'AOB dial pointing the way' trick often. After having measured AOB with the range/AOB finder, turn periscope until AOB needle is at 180 (or 90p/stb to set up for the kill), press '-' (or was it '+', anyway: set heading to view). And then the uboat turns to a parallel course. As good as the measurement allowed.
I don't think fiddling with the rangedial to change the gyroangle will make any difference though. As long as the gyro angle is close to 0, range makes little to no difference. So it can be avoided if that is the case. The torpedos moving, or the bow being, at 90 degrees to the course of the target isn't the real requirement. It's just convenient for impact torpedos to hit their broadside with the least chance of a miss.
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