This data is only availabale for the USA.
Here you can select the type of image:
Also you can select the level of detail or resolution:
For more information about Terraserver look at 'Geodata > Terraserver'
You can Copy, Add, Multiply, or bitwise overlay the selected source. See 'Merge pictures...'
The useage of Toporama is configured in the configuration file 'map_link.txt' which is located in the root of the Radio Mobile installation.