Originally Posted by Chevrolet Customer Svc
Have you had the opportunity to speak with your dealer about you options with upgrading your navigation system? If not, I can investigate that for you more. I would need you to private message me your VIN and your dealer's information.
Chevrolet Customer Care
GM and Chevrolet both will say that it's not possible.
Also - 2SSRS should be coming out with something to do this soon.