Can someone direct me to the 2013 navteq/Bosch maps for Nissans using an SD Card?

I just got a 2012 Sentra SE-R with Rockford Fosgate radio/Nav (2013's labelled as a Bosch radio - appears to be a partnership between the 2 companies) and the maps are Navteq/Bosch 2011 and outdated as even my place of work which was opened in March 2009 is Non existent on the 2011 maps...

As it is on an SD Card, I guess I need the maps that originate from an SD?

Also, does anyone know who makes the "heart of the GPS" in this Nav unit? Is it Bosch, or an actual big GPS maker like TomTom, Garmin, ETC.

-CL