I've tried to get into the manual TDC thing in pretty much all subsims that had the option, but never really went all the way. My first sinkings in SH4 will undoubtedly be followed by countless misses and botched apporaches but this time I'll keep at it. The rewards are to great to be ignored. I loved the game before my first manual patrol, but this could quite easily develop into a subsessed sort of lifestyle.
John Channing,
It seems as if these trim dives actually improve diving times when done within a certain interval. I might just imagine things, but I'll keep doing them for the historical accuracy if nothing else.