[scott_c2911]

I honestly thought it was a way of simulating weather effects on navigation but what sailor steve has said above does make sense. Even where leeway was concerned the ships held their headings and rather crabbed sideways across the seas. The effect isnt as dramatic as that and the difference is only a few degrees but when sailing across an ocean it could mean that the sailors landfall could be out by hundreds of miles. It must be a bug. Thanks sailor steve for helping me out