Hi.
I got confused along the way. The map that has junction view and lane assist is the one that came pre-loaded in the unit,CN Southern Africa NT 2012.20 all. This map is not detailed as compared to 2012.40. I tried every thing I could to get juction view with 2012.40 but failed. I even removed all the maps in the system and replaced them with 2012.40 but nothing.
Can someone walk me through in the installation of the maps and all necessary files to get it to work.

What are the other files for, 3D, ASR and G2S? Will they work in the Nuvi 40 because they were never pre-installed?
Thanks in advance.