I recently got a 2004 RX8. I think it's the touring model because it has navigation in it. The only problem was that it says "Insert disc".What disc do I need to insert to get the navigation to work? I've only been using my phones gps but it would be great to actually use the built in feature that's already there.

 

You need the navigation disc, it goes into the console between the back seats.
I don't know exactly what they cost, but I think they're pretty expensive.

 

So I only need to put the disk in once? or does it have to stay inside the dvd player?

 

Stays in it.
Fwiw, I've never used mine.
I think the tablet replacement mod would be cool, but I'm not tech savvy enough to try it.