Hello Caty,

I have like 3 sd cards, I am sure one of them is formatted FAT32. I will reformat it again.
Downloaded the latest maps to my area, was in a zip folder, unzipped it and an img file appeared. Simply renamed it gmapsupp.
Doesn't show in the map list.
With the existing US maps, what I see is a green screen, no map details but the names of the major cities and the main highway. It seems preloaded as a base map, just in case the owner of the unit wants to purchase an additional map from them.

I tried different extensions to the map, even the old map that I had on my other Nuvi 265 (if I am not mistaken.. the name).
Gmapsupp
Gmapprom
Gmapprom1

I need to try to reformat the SD card with FAT32 and try again.