If we're going for trading and such, how about 'Hanseatic League'? Not as catchy the other suggestions but at least it's slightly less boring than just Merchant Marine, I think. Doesn't have much to do with submarines, but it does at least make up a historical reference and a couple of obscure science fiction references.
As for activities, I'd suggest Trade and Exploration. Transport seems a bit redundant.
Are the ranks customizable? If so, we should probably get rid of the corporate terminology for something nautical themed. Maybe something like Cadet -> Ensign -> Lieutenant -> Captain -> Commodore -> Captain-General?
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