Targeting other parts of a ship?

[panzermeyer]

I've been having a problem, or don't know exactly how to hit other parts of a ship. I looked over the shipchart which shows where the best place to hit a ship is. Basicly the engine room or fuel reserves.

My problem is, I use auto TDC, so the computer automaticly calculates where to send the torpedo. I am not good with manual targeting, at all. So that is why I use auto. Anyway, when I use auto target, the torpedo always hits the same spot, the center of the ship. I do change the depth depening on the ship of course to try and detonate the torpedo either below the ship or use impact to try and hit the critical spot.

With manual targeting, it always hits the center of the ship. So even for small or medium ships, I have to use 2-3 torpedos, a waist. I read many people succesfully using 1 to sink medium or even large ships.

How do I make the torpedo hit a little forward or back of the ship where I need it while using auto target?

Thanks