OpenStreetMap
- OpenSeaMap tool tutorialYouTube
- 01 Installing JOSM - OpenSeaMap TutorialYouTube
- the free nautical chart (Markus Baerlocher)YouTube
- 02 Configurating JOSM - OpenSeaMap TutorialYouTube
OpenSeaMap is a software project collecting freely usable nautical information and geospatial data to create a worldwide nautical chart. Wikipedia