The camera/monitor prop should have a separate material zone that simulates a screen for images.  If one exists and has an associated image attached to it then you need to determine what type of image was created by the vendor.  In that case, you would need to duplicate the dimensional sizing and orientation of your new map for display.  For a simple display, it is easy.  However, if you want to simulate glassy reflections along with the display, then the shader arrangement will be more involved.