Thanks to Wikiwide for exhaustive explanation ! I'll just add: On PC, the map tiles are stored in your home folder inside the .modrana/maps directory. (If your Ubuntu username is for example also justmemory, the absolute path would be: /home/justmemory/.modrana/maps As the .modrana directory has . in front of its name, it is by default "hidden" and you might need to enable "show hidden files & folders" in your file browser to see it.