TDC
It also depends on whether you have your Torpedo Data Computer set to tracking mode or not (is the big red button lit?).
With the TDC on, you enter each piece of data once, and the firing solution continually updates (you can see the gyro angles moving if you look closely or hover over the arrows).
After you enter your initial firing solution, lower the scope and wait a bit while letting the computer run. After a few minutes, you'll want to check the TDC's solution. Hover over the bearing indicator and it will tell you a number. Raise the scope on that bearing, and if your solution is correct, the target should be smack dab in the middle of your crosshairs! If not, you need to adjust something (probably target speed).
You can also aim at different parts of the ship or even ahead of the ship, just make sure to 'click' the bearing into the TDC and it will work with your range / speed / AoB data to continually update the picture based on what you told it. The TDC assumes the center of the ship is where you clicked, which might be different than the *actual* center of the ship.
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