@TAIP
Hello,
You want to save a route. On Route planner this is possible, see More options at bottom left corner of your screen. You can export it as a file or just save it as a favorite.
https://community.windy.com/topic/21103/coordinates-and-navigation?_=1662994299927

So while navigating you can reload the Route planner with new weather data (if you have broadband connection at sea of course). You just need to delete the way points that you have already reached.
On which type of boat are you navigating ?