I have a BMW mini and have swapped the mk3 cd unit for the mk4 dvd unit. My old system was SW3-1/50 and the new one is SW4-1/40. What differences am I meant to expect? This is the first time I've used a sat nav (except for the short time I used the mk3) and I was told that the dvd version would be much better but I cant see any difference if I'm honest. In what way is it better? Is SW4-1/40 the latest dvd? Any help/advise would be great.
Jayne