Navman GPS units - Do they have Hema maps installed?

The short answer is "No, they don't".

Some of the Navman GPS units do have some of Hema's 4WD track data embedded within their maps, but they do not have the Hema maps installed.

Below is a link to the Navman website with information:

http://www.navman.com.au/car-gps/features/4WD_Tracks/