For a vehicle that was over $65K new, the navigation system just plain sucks. I have the most current disc installed. I live in a city that has a metro population of over 1 million and the damn thing can't even find a house on a street that has been there for 20 years. I have had so many bad experiences with it not being able to find addresses, that I keep a Garmin in the glove box. IT'S A MERCEDES! THE DAMN THING SHOULD WORK!!

This being said does anyone know of any third party options to the current navigation disc? IMO, Garmin, Tom-Tom or Magellan could rack up with their own disc.