Thanks for your answer.
I am a particular user because I don’t sail.
I want to use your tool with students.
The GRIB files I have are 0.5 ° by 0.5 °, a geographical interpolation is preferable, but for ease of understanding, I would have liked no temporal interpolation between the three hours data that I have in a GRIB files.
What kind of geographically interpolation do you use ? Linear or spline ?
If I understand correctly, between two routepoints, there is no temporal interpolation (and geographically ?) and the wind is recalculated for each routepoint with a interpolation between the time and time+3 hours. Is that correct ?
Thank you, I’ll try to think about how to use it knowing these facts.