I am having difficulty installing the latest map to my older Nuvi 760. I have purchased a 4gb SD card and created a Garmin folder on it. I copied the unlocked gmapsupp.img map from this thread into this Garmin folder but when I turned the unit on the Map Info button was grayed out and it wouldn't tell me what map was installed. Then I moved the .img file to a Map folder in the root of the SD card and still no Map Info. Then I put the .img file in Garmin\Map folder and still nothing. Then I just put it in the root of the SD card but still nothing. What am I doing wrong? My Nuvi 765 reads it from the Garmin folder on the SD card and so does my Nuvi 1490T so I know the file is good. Is there something I need to do to get it to work on my Nuvi 760? Please help. Thank you.