Originally Posted by Hex
Talk to the dealer first, but for nav your best bet is either switching out the unit or going for an aftermarket like garmin.
There is no way to upgrade your head unit. You would need to replace it with the 430N.
Not really worth it imo, there are some really nice mounting brackets available so you can position an aftermarket garmin where it will look good.
Also, I have the 430N. It can be annoying always having to "hide nav" in order to do what I want on the stereo, then re-open Nav screen.
Not to mention it will not permit certain actions while the vehicle is in motion, all this can be avoided with having a seperate unit.
Also, map upgrades are more expensive for in dash units I'm told.