I have found that a lot of newer streets are not on my stock 08 Nav Disk. Does anyone know where I can upgrade my disk to cover up to 2010?

 

You're in luck! Navteq has just released a new version. Unfortunately, it's $199 + shipping.

http://www.navigation.com/

 

Does anyone have any idea whether updating my disk will also update my firmware, locking me out of the screen when I am not in park?

I have the 2006 disk now.

 

I would think that someone out there knows how to bypass that. I would like to see if someone can hack into the video system in the back to show video in the front screen.

I will have a 2008 Nav disc available soon.