Just found this post... decided to try flashing my six-year old nüvi 1340 to give me junction views.

Followed the instructions provided in the first post (had to blow the dust off an old WinXP PC to be able to do so as it said that the Updater isn't supported under Win7), and all went like clockwork, as expected. Tried a simulation, and low and behold, I now have junction views,

Many thanks to dvazg