I bought a garmin 60csx with topo and city navigator back in nov 2006. I see they now have a city nav 2008 update. I was going to buy it at $80 (which is a joke) but the package said it was for NT compatiable units. I asked if that included the 60csx to the guys in the store and they had no idea. Which one do I need? The only update discs I have seen were for NT ones though.