Well, after the old HP ME quit, it was time to buy a new system.
SH3 has run great, the graphics are impressive, but other factors are disappointing-
1. range scale in km instead of nautical miles.
2. inability to provide longitude and latitude readings (which was great in SH2 with the black out map).
3. inability to run on surface using batteries, nor manual dive planes.
4. no random damage.
5. silly English language wavs.
On the other hand, at least duds and prematures are modeled in. Don't really care for the fatigue aspect, as the bow and stern torpedo rooms had bunks. I've mastered manual TDC after a few attempts...
I've located about two dozen WWII U.S. submarine war patrol reports off the web; reviewing them would go a long way in developing SH4 (not to mention interviews with sub vets and reviewing the online manual).
http://www.maritime.org/fleetsub/index.htm
Yours, Mike
SH4 needs S-boats, V-boats, and other classes, the British and Dutch also had subs which fought in the Pacific!