There are 2 ways to export your maps: All your maps in one file or export the maps individually.
Export All Maps
Go to Tools > Export and Select “Maps”.
You’ll download a XML file that contains information for all your maps that you can then import in any other WordPress site that has the plugin installed, going to Tools > Import > WordPress.
Export Individual Map
To export just a single map, you should go to the edit screen of your map and click the option ‘Download Map Export File’.
The downloaded file can be imported into any WordPress site that has the plugin installed, going to Tools > Import > WordPress.
If you’re importing the map to a site where that map already exists, the import will fail. You will need to delete the map to be able to import it again.