Well if they want to make it arcadey they can have ships putter about on the world map like motorboats, but given the fact that it's a global game and that sea transport is going to be even more important, I would hope they at least have trade winds, monsoons, and doldrums. There is a reason they are called 'trade winds' after all. You could invest in research by your fleets to map weather patterns, giving you the advantage in directing your fleets and so forth, and advances in meteorology generally could reduce the incidence of ships being lost at sea.
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