I've got an '01 E38 with MKIII widescreen NAV and am wondering what is the best version of the software to be running. I upgraded it twice since I have had the car. The first upgrade gave me split screen which was great, but the next time I did it I saw no change and learned that the upgrades were only for DVD based system. So, should I leave it alone or is there a newer version that will do something for me?

Thanks