The later discs are far better IMO. Not sure if it changes the iDrive nav in the same way it changes the older nav like in the e46, but updating the software and map disc was one of the best things I've done to the car.
The iDrive is an independent update to the Nav disc, the DVD is just maps, POI and TMC info. The dealers have to flash the whole unit which takes hours to get new software onto it. Mine was flashed this week with the latest update as it'd hung a couple of times.
 
	Thats the dash from my 07 car, the bottom slot is the Nav DVD drive but you can also put a MP3 DVD/CD in there and listen to that if your not using the NAV DVD at the time. Just appears in the Entertainment menu as DVD drive.
The NAV DVD is obtained from a BMW dealer and costs about £120 for the latest one.
 
	 
  
 
		 
 
		 
 
		
 
 
