Yes. You're absolutely correct. Customers are able to update their nav maps themselves. It involves purchasing the media for a small price ... 10 bucks or so. Then purchasing the FSC code. The code is a unique identifier based on your vin #. Its done like that so codes cannot be shared between vehicles.

Codes cost 200 bucks, which essentially is the same Price as the old pre CIC idrive map upgrade costs, and is entered in by the customer.