Scott
I have had my 1197c NVB for almost a year. As I understand my unit has 2006 NVB software.
I am sorry that I purchased this unit with NVB, because it takes up memory space and I have purchase a Navionics Hotmaps card. This way I can update to the latest chip when I want.
Unfortunately Navionics does not publish which lakes have been updated with each new release.
George