In general, the mark creations work quite well. Only WM-12:56 and LM-12:44 are way off for which I don’t have an explanations, the wind didn’t change that much in that upwind leg.
I have re-plotted LM-12:44 at 51.74553 , 3.90236, pretty close to the stbd gate. I think you plotted its position incorrectly.
WM 12:56 is indeed a bit off-course. I will see if I can find an explanation.
