just wanted to let everyone know that it is possible to install maps, topos, POIs, etc into the Kenwood 7100 (and I'm sure the 7120 is the same) via SD Card. I used the regular Garmin Mapsource Topo discs, and have done the install on Windows as well as on Garmin's new Mac software (hooray!).
I was doing some research on adding maps of Mexico to my unit and came across a thread on an FJ Cruiser forum which explains it all. Their directions are all for Windows installs, but I can speak from experience that it works just fine on Garmin's Mac software as well.
http://www.fjcruiserforums.com/forums/s ... x7100.html
I also had success adding the Baja maps from LBMaps.com.
The only caveat is that unless you own an additional copy of City Navigator with an additional unlock code (and have it installed on the same SD card), you need to remove the SD card in order to see your street maps again. Small price to pay...
here are some shots of the topo in action (in Silverton, CO - elevation 9,318) and the screen showing that topos are enabled.
Happy travels!