To access the background map functionality through JSL, find an example in the Sample Data Library. For example, run JMP and select Help > Sample Data Library and open Pollutants Map.jmp. Edit the script called Bubble Plot Street Map. Look for the command in the script that begins with Background Map.
There are two types of background maps that you can specify: Images() and Boundaries(). Each of these then takes a parameter, which is the name of the map to use. The name is one of the maps listed in the window.
For Images(), the choices are Simple Earth, Detailed Earth, NASA, Street Map Service, and Web Map Service. If you use Web Map Service, then there are two additional parameters: the WMS URL and the layer supported by the WMS server.
For Boundaries(), the choices vary since boundaries can be user-defined. But a typical choice might be World.
JSL Scripting Example shows the result.
JSL Scripting Example