Current NAV Disk that ships with a new vehicle (07) is:
Part 15906573 GM Navigation Map Disc US - Canada Version 5.0
Current NAV Disk that is available through the GM website
www.gmnavdisk.com as a subscription or individual purchase is:
Part 15906573
U GM Navigation Map Disc US - Canada Version 1.0
I do not know what (if any) the difference is between the two (other than availability), but having used both in my 07, I know both will work in the H2 TS Nav unit.