I just bought a Pioneer AVH-P6600DVD and I'm confused on the nav. does it have it? is it an add on? Do I have to buy a whole AVIC unit or can i just add an AVIC brain to the system to get navigation.
no, the 6600 does not have nav standard. It is available as an optional add on though. I believe it is the avic-88dvd, which just plugs into the 6600 brain.