oh, I forgot.
When you need to recover fatigue, just sail around a bit at 1x TC and you see them recover faster than at 1024x TC. It may get boring, so listen to some tunes and maybe have a smoke break
Also, as officers go:
1 qualified in engines and damage
1 qualified in control room and damage
1 qualified in control and watch
1 qual. in control and torpedo
1 qual. in watch and control
You can switch them around easier and not have any nasty surprises by the way of surface threats.
ONe more thing, I like how in sh4 the watches switch automatically, but with my method in sh3, there really isnt a problem arrising, just the changing of the watch manually may become tedious to some, but it does offer a more immersive feel to the submarine simulation.