An update:
I have been back to the dealer's twice to try and load satnav update DVDs. Neither worked. I have had several more contacts with Nissan customer services and am currently awaiting a response. I have also contacted Navteq customer services in Holland who were quite helpful but....
As a result of my research, and noting other threads here - "2010 satnav DVD" and T31 (latest model) audio Bose", I think I understand the situation - which is more than be said for my dealer and Nissan Customer Services!
When I test drove the T31 at one dealership, it had the Bose system and DVD satnav.
When I ordered at another dealership, it was marked up "No Bose" on the order form. When I asked what this meant, I was told that a different system was now in use with fewer speakers but otherwise there was no change.
In fact the "no Bose" system means that a Nissan Connect premium HDD Satnav and Music system is installed. Presumably the absent features mentioned in earlier posts only apply to the Bose version.
As regards map updates, Navteq state that, unlike the Bose version ie with the DVD satnav, for which they brought out update discs (to complicate matters these are either version 6 or version 7 according to the kit fitted), they are not taking responsibility for providing updates for the HDD system and that will be down to Nissan. They also say that there is no update yet available anyway so the 9-10 No 1 map in my car is still meant to be current.
This surprises me since changes two or three years ago on the A road network aren't shown. Maybe they aren't on the Jan 2010 released Navteq update discs either. It will be interesting to see if, in a year or so, I receive any info about map update availability, and how it might be done.
Whilst accepting that manufacturers can constantly change spec and that manuals don't keep pace, my contention is that there should be a bank of expertise / knowledge base available to dealers and customers able to answer such queries. Such a facility is lacking at Nissan it seems and my opinion of the brand is lower as a result. Customer Services have done little to improve my view. The MD - Paul Wilcox has not responded to my email about these issues.
Perhaps if enough customers make contact about the confusion over satnav / sound system kit in the 2010 Xtrail, someone will get a grip and take a strategic view of how such issues can be managed effectively.