There is a NCDC2013 and a NCDC2015.
Both are sat navs with front loading 5disc magazines - just like the 2006s.
The 2015 should come with a unit for sim card in the glove box.
Vauxhall ask for about £1,000 for a new 2013. They come up very rarely on Ebay in UK. I sourced one from ebay.de with its CID - think I paid £700 all in or thereabouts.
The 2015 looks near identical to the 2013 apart from several buttons on head unit. In the 2013, there's a 'home' and 'alternative route' button for the sat nav which are replaced on the 2015 for an SOS and Roadstar functions. The alt/home functions have to sourced from the main menu on the 2015.
If I recall correctly, there's also another unit (NCDC2012?
?) that has cassette tape and radio with single slot cd player for the sat nav disc. This front loading disc also plays standard cds if you wish. Never seen one in the UK though. Think this was a no cost option on 3.2 Elites but who'd chose to lose the cd magazine for a tape?
How's the Senator going???