Audi has google maps that update via cellular data (which you have to pay for).

Where does the map data for the BMW navigation come from? a disc that has to be replaced to get updated map info?

Where does the traffic information come from? Sirius or cellular?

Does the traffic information get laid out on the map routinely or does a person have to click a few things to get it to tell you if there are traffic problems?

Any info would be appreciated.

edit:

I am realizing that no one has an F15 yet. How about the same questions regarding the E70 navigation?