What navigation CD do you need for a 2005 Chevy Avalanche?

A 2005 Chevy Avalanche doesn't use a navigation CD. The navigation system in that year's model was either not available (depending on trim level) or used an internal hard drive-based system, not a CD. There's no CD to update or replace. If you have navigation issues, the problem likely lies within the navigation system itself, requiring repair or replacement.