First question is, where is the best place to get them?

Second: do I need the original 2006 XC90 before buying the 2012 upgrade?

Third: does it have to be "Volvo" and "XC90" DVDs?

Last (for now): how far back can I go? 2004 DVDs in a 2006?

I mean Costco has Nuvi's with lifetime update included so I'm not sure why I even want the built in navi system (of course without disks I can't even test it)

 

Can anyone tell me anything about the navigation system or DVDs? I'm just looking at a black screen that says "insert disc"- I don't even know where to put the disc(s).

Alternatively, what is this? Is it not part of the nav system?