My CN map came. It was in the form of a SD microchip. I loaded into the Montana and connected the device to Basecamp on my mac. It took about 10 minutes for Basecamp to read the map, and when it was done, it switched to the new CN as a map. Pretty slick. All of North America is on that card. My old Csx required me to send maps from my Mac because it wouldn't hold the whole continent.
Anyway, I rode a few local routes yesterday and it worked well.
$45 from Amazon.