2008 free NAV update??

All,
 
I am getting this message "Unable to calculate route" when I input an address on my LR3 Navigation, so I am guessing its time to update?
 
Before I came onto this forum, I first googled "free DVD NAV update for LR" and came across a hack for updating the NAV while in motion.  As this is good for one of my other complaints for nav, I still haven''t come across someone finding a method of getting a free 2008 DVD NAV upgrade for my 2006 LR3 SE.  Does anyone know how I can do this?  I came across one forum where the members were discussing burning and image (ISO) to a DVD DL disc?  But, wouldn''t I need the file first?  How can I get this file?
Any information regarding this topic is greatly appreciated!
 
Thanks!
Lost.