No, our car doesn't have Nav. ALL maximas have a central information screen in that spot, though. If you don't have Nav it's just a large LCD screen with a backlight, but it serves the same functions for configuring features.
So you can indeed still disable it even with Navigation. I checked the manual to be sure. You can download it here, too:
http://www.nissanusa.com/pdf/t...a.pdf
I definitely agree the options packaging is a pain in the behind.