Just a heads up that I just posted what I refer to as a "targeting assistant" over in the SH4 main section.
It's a graphic change to the grammaphone that replaces the convoy speed chart with information and formulae which I find useful if trying to hit something manually -- especially if playing the S-Boats without using the position keeper or changing the pistols or speeds (despite the fact the game lets you).
Credits to Hitman included since it includes the AOB formula and sinus scale from his targeting tutorial.
There are no moving parts to this -- it's just a reference to help you with your calculations.
Enjoy!
ElCid97