... and the manual seems to skip some of the more important points of submarine warfare, preferring that you deal with things the way the Asiatic Fleet did in December 1941...
- kind of on your own... If a target is traveling toward you as you shoot at it, it will close (naturally) and the torpedo closes on it, so take that 450 when you shot shortens up to 400 fast. Not so important if you do a near-90 shot.