Map of the “Segelfluggelände” (special kind of airfield, where more or less only sailplanes are allowed) in Germany
Own work
mapdata from Naturalearthdata (public domain)
Coordinates of the airfields extracted from de:Liste der Segelfluggelände in Deutschland in this Version
Icon used is File:Mapicon Segelfluggelände.svg (made by me for this map)
El Grafo