The torpedo needs to lead the target, or else it will never result in a hit, allways falling behind. Even if the torpedo never changes direction after leaving the tube. Some angle between periscope view and torpedo direction is required. The torpedo takes time to move to the target, but the target also moves forward. Hence the need for lead angle. For that you need to know 3 things: torpedo speed, target speed, and target AOB. Luckily the game allready computes how much lead is required. The game knows about the torpedo speed, so you are left with providing a speed and AOB value. If the torpedo must change course (gyro angle) then range also becomes an issue because it has a straight section to move afterwhich it makes a curve. That causes a slight deviation on top of the lead angle.
Self searching acoustic torpedos may not need such precision, but early dumb torpedos certainly do need to be steered correctly. If you want better odds than a lottery ticked.
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