Hi, I want to export a map to georeferenced PGN. I am using the Xtherion "Help\Calibrate bitmap" function to register a PDF map to PGN, like explain in the next message. https://www.mail-archive.com/therion@speleo.sk/msg02593.html ThePNG is created appropriately, but I have problems with the ".MAP" file. When I execute the command, it creates a good PGN file, but creates an empty ".map" file. When a close Xtherion, the ".map" file is filled with the information. But that information is wrong, the coordinates are 0,0 (look attached file). Wheres is my mistake? An other question, can I convert the background to transparent directly from Therion. I want import the georeferenced PNG in Google Earth or GIS, and want only have the cave survey rendered and see the other layers around the cave. Regards, Evaristo.