@jbrower I know why now. Cyan occurs if there are GPX format issues, for example floating-point entry of timestamp values. Run a cleaner of some type on GPX files before upload and no problem, color display is normal

Unfortunately, after 3 months, Windy developers don't even seem to know this, or don't care enough to answer, or both

What do the colors mean on an uploaded gpx track ? It looks like heat colors show climbs, but sometimes I see a long section of cyan -- what does cyan mean ?

Also is there a way to show the track all in red, like on Strava ?

Thanks, Jeff