Here you can set the level of detail that is displayed in the overlayed image..
For more information about Google Maps look at 'Geodata > Google Maps'
You can Copy, Add, Multiply, or bitwise overlay the selected source. See 'Merge pictures...'
The useage of GoogleMaps is configured in the configuration file 'map_link.txt' which is located in the root of the Radio Mobile installation. More information at Google: http://www.google.com/apis/maps/terms.html
Google maps produces maps like displayed below: