You can find some information if you look around on Google
This is for an OEM retrofit
This is for the Garmin dealer installed option retrofit
With that being said, it is much easier to use the navigation on a smart phone and place the smart phone in the storage compartment on the top of the dashboard.
2013 535i - ED, Oct 2012 | Cashmere Silver | Oyster/Black Nappa Anthracite | ZCW | Sirius | Air Blue 80
2008 X3 | Monaco | Sand/Black Light Poplar | ZAP | ZPP | ZCW | Xenon | Rear Fog
1988 Grand Wagoneer | Burgundy | Ghost Flames | 360 ci | Holley carb
BMW CCA #422951