We'll need zero Gyro Angle torpedoes (Locked instead of limited to 15º) to go along with this mod
I have figured out how to get both the periscope lead angle and alternatively the moment of shooting. For the first one, you need to enter all target data into the TDC and NOT start the position keeper. Once the data are fed, the difference in degrees between the arrow in the lower dial (Gyro Angle arrow) and the line of sight (upper part of the dial) is the necessary lead angle, so you just need to turn your scope that many degrees in direction to your target and shoot when it crosses the periscope line. For the second, you would simply follow the target until the arrow matches the bow of the ship silhouette on it, at that moment the necessary Gyro Angle is zero and your torpedo will find the target.
Gotta love how frigging challenging it was to hit anything at all with those WW1 methods
