Adding Navigation?

Frankly, I don't know why anyone would want to pay what Nissan charges for a 2nd rate navigation system. It does look nice but for a Garmin iQue can be had for about $400 US and does a better job of routing, is portable, and is also makes a damn fine PDA.

I don't know very much about the Nissan navigational system but I do know a fair bit about the one Lexus uses and it is regarded as perhaps the best in the industry. The built-in systems do a better job in a few areas such as dead reckoning and inertia calculations (when a GPS signal is not available) but for just about every other navigational feature they are not as good as the higher end portable units from Garmin or Magellen. Map updates are very important and a lot of automotive GPS systems aren't updated very often or offer much detail outside of the continental US. Map updates also tend to be very pricey. Having used mapping GPS units for about 5 years now, I'd be very unhappy with a system that I couldn't add my own waypoints to or use off-road.