Even with manual aiming, i find that it is still easy to hit the ship if you just set a firing solution and just wait for the ship to REACH that spot before firing your torpedoes.
Even better if you are 90 degrees to the ship and less than a km away. With your speed, it should be no problem at all. Just try to attack at night though or they have a much higher chance of spotting you or the torpedoes ;p
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