Thinking of getting a Blaupunkt TravelPilot R52 fitted to the current set of wheels, together with a hands-free for my phone plus a CD changer. Biggest problem is where the heck to put the aerial(s) on a SLK!
These in-car nav systems are getting very clever. They now contain gyros and use the wheelspeed feed which runs the 'auto volume speed compensation' to assist with the navigation algorithm.
Remember signposts and milestones?