I'm not sure what a MY06 Sat Nav is.
I have an 04 fairlady which had a factory fitted standard Sat Nav. Because it does not work in the UK I replaced it with a Nissan DVD Navigation System Kit (Nissan Birdview Navigation System 350z Z33 08/03 >) which I got of Ebay (unused and complete including maunals and installation documents). The kit comes with a CD-ROM programme but no map DVD is supplied with the kit.
The only other info I have is the Nissan part number of B8280 89980