I just saw this sorry mate - so the off road data is "provided by Hema" which I have discovered is an entirely different thing. That being said I quote from the Navman com au site
"4WD GPS Tracks for the adventurers
HEMA 4WD GPS tracks are available for download
Go further than ever before with the optional HEMA 4WD Tracks download. Perfect for those weekend warriors who want to their 4WD out on to the dirt. These detailed downloads feature "off road" guidance along known HEMA 4WD Tracks with over 8,000 relevant POIs and great locations for outdoor related activities.A full list of tracks covered can be found below.
HEMA 4WD Tracks are built-in on the MYESCAPE II, MYESCAPE and MY75T and are available to purchase as an optional extra for the MY450LMT, MY400LMT, MY300LMT, MY350LMT, MY85XLT, MY80T, MY65T and MY60T."
But go to the shop and they now say they have the HERE 4wd maps?
Yet to throughly test but picked up Black Forest tracks, fire access tracks in st Andrews and Murrindindi river nth tracks.