Newest Garmin map and #D map img.  Works on all Nuvi devices.

Instructions:  Back up your old gmapprom.img and gmap3d.img files somewhere safe.
Then copy the new files into the /Garmin directory.  If you don't have enough memory on your device, you can put a directory on an sd card sd/Garmin/Maps and put it there, and then select it from the menu in the device