The Cartographer is a tool added by OpenBlocks. This tool is used to turn Empty Maps into Height Maps, used in Height Map Projectors. The Cartographer will follow the player who placed it. Sneak+right clicking with an Empty Map on the Cartographer will let it write to the map. How much of the map has been written can be seen by viewing the green light on the side. If the entire green square is bright, rather than dark, the map is complete. The map can be taken out by sneak+right clicking. Breaking the Cartographer will not drop the map when broken.