text: Hi Michael - welcome to Openstreetmap. I think that you may be using the OSM notes feature like as if it's for personal markers. Perhaps not - however I don't know that there are any easy ways to add a 'childrens orienteering course marker' to the map. It is possible to add a point with this tag: information=route_marker. Given that I think you know the locations for the markers you could do this relatively easily - you may need a little help... do ask. These probably won't show up on the map - but there are other ways to extract the information later. 