Sailor Steve advice is on the money.
The best setup is for Operation Moonsoon is OM/OMEGU/Kiub.
OM has an Atlantic Ocean Enviromental mod or a Pacific Ocean Envrionmental mod option. OM is a very good game, but finding captial ships is tougher that SH4. It is compatible with RSRDC, so if you are in the Pacific Theater, RSRDC will have an impact if it enabled.
OMEGU stand for Operation Monsoon Environmental and Graphic Interface Upgrade mod. I believe it is created by lurker, who created OM, but I may wrong on that.
Kiub is the Kriegsmarine Interface for UBoats, and is by Karamovnew. It is is quite a good mod, too. The AOBF (angle on bow finder) wheel is a piece of work!
You use multi-SH4, a program, so you can run more than one version of SH4 at a time.
All post re OM should be in the ATO fourm.
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