As far as I can research, BMW's maps are from Nokia, who bought out Gate-5's 'smart2go' mapping software, and reworked it into what they called 'Ovi Maps'. Nokia also bought out Navteq, and Ovi Maps/Navteq became Nokia Maps, which they then re-branded as 'HERE" maps, and HERE WeGo.
HERE was then bought from Nokia by a consortium, which the main shareholders are Audi, BMW, and Daimler. Other minority shareholders are Intel, Bosch, Continental, and Pioneer.
HERE supplies Nav maps for Acura, Audi, Buick, BMW, Cadillac, Chevrolet Chrysler, Dodge, Ford, GMC, Honda Hummer, Hyundai, Infiniti, Jaguar, Jeep, Land Rover, Lincoln, Mercedes Benz, Mercury, Mitsubishi, Nissan, Oldsmobile, Pioneer, Pontiac, RAM, Saturn, Subaru, VW.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE