Thread: which new maps will work on Nuvi 1490

Originally Posted by NickSums

Looking at the .system folder there are no files with an extension of .unl or .gma

there are only :
fs_image.ver
gmapbmap.img
gmapbmap.sum
gmapprom.img
gmapprom.sum
.

the gmapprom.img should be the large file with the maps inside. If you are unsafe what to do, take a 4GB micro sd card, create a folder "map" on the sdcard, and copy the 2015.40 version "gmapsupp.img" in the map folder on the sdcard. The original gmapprom.img on the device rename to gmapprom.im_, so the nuvi cannot detect the old map. If the new mapfile doesnt work, you can go back the steps without "data loss".