To get the USB in the center console, you have to order the iPod option. Don't order it and no USB port. Navigation has nothing to do with it. For a 528 or a 535, you either order the Premium Package 2 which has Navigation and the iPod option (among others) for $4,900 or you order the stand alone iPod option for $400. The navigation is standard on the 550 and you get the iPod with the Premium Package 2 for $2,800 or as a stand alone option.
2011 Space Grey E90 M3, DCT, Comp. Pkg.
1997 Z3 2.8, Artic Silver, Tanin Red interior, MT
1974 2002tii, Inka, 5 sp manual