@idefix37
Idea is to give a linear approx and approach heading.

Hi from France

I've take Windy today as premium [after 2 year of free use on locked ver.]
Fantastic software.
Before all concerning followings ligns i want to precise that if something is currently use , i' don't know where its located in Windy..
Since i used i've integrate a ruler to follow some trajectories [mb ruler seems ok for me but fied of possibles is large]. I joined here a picture
Do you think possible to integrate it with button?
Marc