I have searched the owner's manual and see nothing about how the Nav. system works. There is only a reference to the Navigation System Manual. Is the 10GB storage only available with the Nav. Sys.? I saw a reference to the storage without any reference to the Nav. Sys., only the 9 speaker Pioneer option. Does anyone have a digital copy (or source page) of the Nav. Manual? I'm a tad confused about the Cruze Infotainment offerings still. The Cruze web site also seems short on details. Thanks.