I have never seen 0 wind, usually I get at least 2 m/s with still sea. Bad wheather max I've seen is 16 m/s and sub awash every moments.
I have also never had still sea for more days in a row, but that doesn't mean anything, could still happen to me I guess.
Did you ever make any changes in the TDW 'EditorViewer' ? That's the only possibility I can think of, because there are no weather settings in the Game Options AFAIK.
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