Hi,
I put CN North America NT.img file (unlocked with gimgunlock v0.03) on a microSD into a Garmin folder.
Map is well displayed on my patched Nüvi 68.
Then I put corresponding JCV folder (containing .jcv file) in the same Garmin Folder and splitted jonction view is also well displayed (on simulation).
But I've got an issue with foursquare folder : on Nüvi internal memory, CN Europe NTU is installed and there is only one .img file for foursquare into a Map folder into .System repertory.
For CN North America NT, I downloaded two files (one .img and one .sid) from post #2. I put the .img file into a Map folder inside Garmin Folder on microSD and .sid file into SID folder with others downloaded .sid files.
No foursquare map for CN North America is displayed on Nüvi (and obviously foursquare search does not work).
Then I unlocked forsquare .img file with gimgunlock v0.03 because I noticed CN Europe one was locked (.unl and .gma files in Map folder), but it did not change anything.