"The SH3 campaign" is the complete WWII scenario for the German U-Boote, but lacks traffic in the Black Sea or the Far East.
Modders have added the missing scenarios but didn't want to merge it into the original data, because the loading time and the cpu consumption suffered heavily.
Some have even split the original data into smaller campaigns (Artic/NorthAtlantic/Med/SouthAtlantic/US) to reduce the problems.
If you want to play a special campaign scenario, you'll have to replace the original data with your chosen one.
Starting a new career matching the installed "campaign" timeframe and location will spawn you into your little world.
JSGME - the general mod enabler - will help you to manage your differnet campaigns.
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