What MMI do I have???

[4MOTION]

Hello

I hope you can help me out, I have an Audi a6 2009 avant,

i have what i think is a mmi radio plus, i have bluetooth and phone prep along with fin antenna, in the glovebox i also have a drive with 2 sd card slots and a colour screen.

all controls with a sat nav button just below the gear stick.

i wanted to find out if and what the process was for getting sat nav?

thanks

Zak