@Chris66… on the listed website, you can see, there are 3 positions specific allowed for OSM: osm_lake, osm_river and osm_roads. Or am I wrong, and these positions are “just” the existing OSM-datas?
@Richard… I’m going to map myself. But, it will be a nice help for the orientation. If you see the rivers, forest ect. in the background, it’s much easier for mapping…