You can try the offline viewer which is included in the OH source.
I made it now also as standalone, you can get it here
http://verpaalen.com/openhab2/RoboMapviewer2.5.7.jar
you run it like this java -jar RoboMapviewer2.5.7.jar (assuming java is in your path, and the viewer is in the current dir, otherwise add the paths appropriately)
clicking in the graph should give a coordinate… The rrmap files are saved by the binding in the userdata/miio folder.
note: I copied this now to a new topic-> Xiaomi Vacuum Map Viewer (to find coordinates for zone cleaning)