another thing with this game is the dial needles don't point to correct settings so if its on zero you may well be set to 2 or 3 degrees instead.
its all in the rendering and resolution you are using as for just how "off" the settings will be, its most notable with the speed if you just click on the dial it never sets the speed you point to
a good point was made about being surfaced and the wave action shifting your course because while the game doesn't have current in it it does have wave action that changes speed fuel range and direction of travel that is selected but if I plot a course it always follows it
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