How does one upgrade the maps on the 2007 G35s?

 

I can't get the local Infiniti dealer to give me a complete answer as far as cost.

Basically you go to Navteq? You purchase a download. The download as far as I can figure out is done at the dealer and I think it may go on to flash memory. The dealer then installs this on your system.

Navteq? is about $195 (rip off in my mind since the original maps were out of date when I purchase my 08) and then this is the sticky part, how much does the dealer charge? I simply can't get an answer from the dealer so may have to go somewhere else if I decide to spend the bucks for something I don't really know if I will gain much in my area.