1 2011 Update Gm 20940248 GPS 6.0c Navigation Disc Updates 2007 2008 2009 2010 2011 Tahoe Yukon Avalance Silverado Suburban Sierra and DTS 2007-2009 SRX This is a new open box and the newest update available from GM updates many GM models from 2007,2008, 2009,2010,2011 This disc is on a 90 day back order from GM so get yours now GM Navigation Disc for 2007 2008 2009 2010 2011 Tahoe Yukon Avalance Silverado Suburban Sierra and DTS 2007-2009 SRX