I've wondered why BMW even uses DVD for the database. It has too many moving parts, the discs (or is it disks?) get scratched, the discs get stolen, etc. They should ditch the DVD altogether, put a solid-state chip like a CompactFlash card in and have downloads sold from the dealer -- at a reasonable cost.
One thing I'd like to see on my Nav system is a learning mode. Then when I drive where the map says there aren't any roads I can update that. But then, the system would cost more.
Six of one, half dozen of the other.
