See also this related post. Afaik. Windy uses Google projection, aka. Web Mercator, Google Web Mercator, Spherical Mercator, EPSG:900913 or WGS84 Web Mercator. It is a variant of Mercator projection, used as standard in Web mapping. As one can see on screenshot below Google Maps itself provides well a map scale on UI, which could always help: [image: 1604414748009-titi.jpg] Of course, displaying also on UI the current cursor position on map (lon/lat) would be a plus; Leaflet, as well as all other GIS frameworks provide UI controls for both map scale and cursor position.