I think only BMW could tell you that.
I got it because I had a 135i that didn't have it and I hated the controls for music in the base systems, that small little orange screen is from the 80's.
I didn't get iDrive really for Nav, but now that I have it I use it quite a bit. I mainly got iDrive for music/media management, email/calendar/messaging, call display, voice controls.
Now if only I could hack the traffic reporting functionality to work that would be great!
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