SH4 is intended to represent the pacific theater, thats right.
Though, the addon UBM stands for U-Boat missions and gives you the opportunity to take on the role of the german 'monsun boats' that where also active in the Pacific to assist the Japanese.
But there are (cost free) mods that also give you the whole atlantic theater for SH4, too.
Check out the ATO mods forum for SH4, especially look for the Ops Monsun supermod.
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