New A321 features? How to use?

Hi! I see new feature on the A321. Can someone explain or point me to a post explaining them? Specifically these are new to me on the systems panel: “Master”, “Source GPS (Source NAV1)” , MFD Range," and “MFD Map Nav. (MFD Map ARC).”

I don’t however see the new scenery just yet on my iPad Pro.

thanks!!

Here you go bud

@TransportForLife Cool thanks!