If the ship is heading in one direction and you know it will stay that course for a while longer, put crosshairs before the ship of where your prediction it may hit. Depends the distance, and whether it knows your there for you to put the right speed of the torpedo. If it's going fast and from a distance of at least 1000m, I'd recommend torpedo speed be medium but sometimes fast is better. Works for me, it's a challenge, you got to shoot at the right time and from the right direction.
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