PlanetsCentral

You may log on markers by clicking right, as you would do with ships. And may add a comment to this very marker then logged on with F9 which is also written on the map - at least with default settings. This works very good for setting wayponts for fleets you don't want to control via fleet manager. I usually draw a marker at a spot I set as waypoint and add the coordinates as comment. This is also shown inside every navigation chart at the shipscreen.

Thank you. I understood.