Of course it changes by a few degrees constantly. As you're in a submarine and not in a sail boat it doesn't matter so much however. Also, consider that somehow these values have to be generated by the computer. Expecting a complex and realistic weather simulation inside a retail market submarine game from 2005 is a bit too much. Also, IRL the 1 WO or whoever took the weather observation wouldn't give you a wind direction in degrees every minute. Please.
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