From the JMP documentation
Help==>Books==>Essential Graphing
Page 312
In order for JMP to automatically find your files, place them in the following directory:
• On Windows: C:/Program Files/SAS/JMP/13/Maps
• On Macintosh: /Users/<user name>/Library/Application Support/JMP/Maps
I run on Windows, and the distributed maps are located where indicated, so I assume the path for the Mac will take you to them too.
Jim