JCV file for City Navigator North America NT 2012.40

My nuvi 40 came with D3479000A.JCV and is 113,872 = 111 MB.

Unless you have free lifetime map updates with your Nuvi 40 you CANNOT update just the JCV file.
Each JCV file corresponds with the map, therefore you cannot use a newer JCV file with an older map version.

If you have lifetime maps, then when you update the maps from the Garmin site for the Nuvi 40, the update will install the proper JCV file at that time.

If you have 2012.40 maps then you can download the compatible large JVC file. I don't know the folder structure on the Nuvi 40 but you can put this new file in the same folder on an SD card and then remove the existing JVC file from the Nuvi by copying it and then saving it to your PC hard drive for safe keeping. The Nuvi should find only 1 JVC file, the new large file on the SD card.

http://download.garmin.com/support/2012_40/NA/JV/D3060050A.J...

Note that this is the full screen JVC file. There may be links out there for the full half screen JVC file but I am not sure about that.

I have updated the map to 2012.40 and jcv file too. When I do the test routes, I do see the junction view - some are greyed out and some are not and when I click on it, it shows black screen. Is it suppose to show the junction view?

If you put the large junction view file on your nuvi 40, that would explain the reason why you are getting black screens and greyed out junction views occasionally. I would just the use the original junction view file that came with your map update in this case. The nuvi 40 was not designed to handle the larger junction views.

Anyone know of a resource or web page that has the recent (big) JCV files for corresponding map updates for download?

Look at bear007's post 4 entries above yours in this thread.