Are there additional features/functions that you get when you have the stock navigation system? Obviously you have navigation, traffic, bluetooth audio streaming. But are there other features you get that a g37 without navi wouldn't have?

 

A cool button on your control panel. A really crappy voice command system. But that may be on non nav cars as well, I don't know.

 

For me, when I bought a new G this year, I went for the Navi version for the better mobile phone integration over the non navi version. With the big issue being the address book download and ability to edit the vehicle phonebook. With the non-navi phone system, managing the phone book was painful versus the navi version, and had no ability to edit or manually add entries. As a heavy user of the phone integration, this is a deal breaker for me.