@Corjan-Meijerink said in Assign a via point/waypoint number:
...Lon / Lat is however mathematically the correct order Longitude representing the horizontal (x) axis and Latitude the vertical (y) axis.
uhh, I believe it's not 100% correct explained.
The geographical length, also called longitude (international abbreviation long or LON), describes the position east or west of a defined (arbitrarily defined) north-south line, the zero meridian. It's following the vertical earth axis.
The geographical latitude, also called geodetic lat or (international abbreviation Lat. or LAT), describes the position north or south of a defined line round the earth, parallel to the Earth's horizontal equator.
But the rest, Corjan - you may know better than me