His B8.5 is certainly not MMI 2G. MMI 2G in the B8 platform died with the production rollover from MY09 to MY10 (May 25, 2009).
MMI 2G had two non-navigation versions (Basic and Basic Plus) and two navigation versions (Basic Navigation and High).
Basic Nav uses a CD and didn't have map display; just a monochrome FID.
High, the only form of MMI 2G we got on any US B8, is the version we all know. DVD drive and color FID.
So we come to MMI 3G, which also had two non-navigation and two navigation versions: MMI Radio, MMI Radio plus, MMI Navigation, and MMI Navigation plus.
MMI Navigation uses a DVD or SD card repository to provide the same style navigation presentation as MMI 2G High, and has the standard control dial.
MMI Navigation plus uses a hard drive and provides the newer style 3D navigation display, and has the joystick control dial and a higher res screen that old 2G High.
US B8.0 MMI 3G, if it had navigation, always had MMI Navigation plus. HD radio was added in MY11.
With the B8.5 refresh, MMI 3G+, which had existed in the D4 and C7 filtered down to the B8. This added the "connect" stuff using a SIM card.
It also integrated Bluetooth audio streaming, but only in the MMI Navigation plus version.
There was still the non-HDD version MMI Navigation version.
Starting MY14, AoA started offering a "MMI Navigation without connect" in the low end Premium trim.
I don't know if this means it's the non-HDD version "MMI Navigation", or it's the MMI Navigation plus just without the SIM card.
Would need to know the PR code on the car to tell.
8DP is the MMI Navigation with the 6.5" mid res screen, and no HDD or joystick.
8DY is the US MMI Navigation plus with the 7" high res screen, HDD, and joystick.
You can always know from the car-setup-software version info:
BNav - MMI 3G Navigation
HNav - MMI 3G Navigation plus
HN+ - MMI 3G+ Navigation plus with connect
In the US, the non-navigation versions of MMI 3G were not offered. If you're looking at a RoW vehicle, it could be anything of the above. Also, if you're looking at other platforms like the C7, MMI navigation plus was MMI 3G+, but MMI navigation was actually RMC. Without hands on a 2014-2016 premium trim with the navigation, can't be sure what is actually in it.
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