Ahoy all! I recorded some videos about semi auto aiming. I hope they helps.
1-Enter range
2-Lock target
3-Break lock and aim with periscope where you wanna hit (if your torpedo officer maxed aim for ships back even edge of ship because of faster torpedoes)
4-Enjoy
Front tube
Front and back tube
And classic cross the numbers method
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TCG Dumlupınar(ex USS Blower-Balao Class)
She was lost on 4 April 1953, TCG
Dumlupınar collided with the
Swedish freighter
Naboland and sunk. 81 submariners died in this accident.