Recently bought a 2006 E350 (have owned 1987 300TD and 2000 E320 prior). Just went on a trip and the nav system is lame. Didn't recognize street names that have been on streets in Sacto, Ca since I was a kid 40+ years ago. At first I thought I just needed an updated disk, now I'm having second thoughts about even wasting my money on one. Anyway, on the trip, I finally turned the nav off and plugged in my $200 three year old Magellan and it worked perfectly. Any ideas or recommendations on the MB nav system? (I did read the book on it before the trip.) Assuming it has not been updated since 2006, will an updated version make much difference?