If any one is interested in putting these file on an SD card for one of the new NUVI 3490's, do the following:-
Put the three directories ASR, G2S and JCV in the 'garmin folder in the root of the SD card and the gmap3d.img file in the 'maps' folder in the root of the SD card. Then create an unlocked gmapsupp.img file from MapsSource and rename it if required to anyname.img as the new NUVIs can use any name now, and put this in the 'garmin' folder as well.
Tested and Junction View and 3D Buildings all work.
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