Thread: Garmin Nuvi MapSet format- how to store them in your device

On my nuvi 775T, both...
gmap3d.img - 3D Image Map (7x5 Series)
&
gmap3d1.img - as second 3D Buildings Map (7x5 series )
...are on the Nuvi Internal Memory (with their associated map IMG files).

Shipped from Garmin, it has CNNA (gmapprom.img) & CNEU (gmapprom1.img) set up that way. Both of their JCV files are in the JCV folder within the Garmin folder, on the nuvi internal memory as well.

gmapsup2.img does not work on the nuvi internal memory for either my 255W or 775T.