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My problem was cured by reformatting the Mini SD card that holds the map data. I had the same problem this week with my Garmin Nuvi 265. After doing an update I received the "No Data Available" message when trying to use my GPS. After trying three days of so-called fixes I remembered that, at least in my case, the map is stored on a Mini SD card. I pulled the card from my Nuvi and popped it into the computer to see what's on there. There are 4 or 5 files associated with the map. I deleted the files and reformated the Mini SD card using the FAT32 setting. I reinistalled the card into my GPS. Prior to connecting the GPS to my PC, I uploaded the latest version of Garmin Express. Once that was loaded I reconnected the GPS and had to re-register the unit. Once that was done the software told me that there was a new update. I ran the update. Lo and behold . . . after about 25 minutes the map was successfully loaded to my Nuvi and it was working as it should.
You are in an area that the map does not support. If this is a new construction or street, highway etc it has not been updated on your map loaded on the device. You can check with Garmins website to see if a map update is available. If not you will have to wait until it is updated and released by Garmin.
Fixed. Called Garmin. It seems that version 4.90 FW on the Nuvi 350 (which came shipped on my 350) has a bug where it cannot communicate with the Garmin software either to update maps or update FW. Tech from Garmin e-mailed me a patch that I copied into the Garmin folder on the Nuvi itself, via USB and Windows Explorer. I then rebooted it; the patch installed itself which then allowed the unit to communicate with the map upgrade software and all is well. 2009 map update is now installed and the Nuvi is working fine again. Haven't tried upgrading to newer FW yet; will probably leave well enough alone.
Does it recognise the Nuvi? Are you connecting it through a usb Hub. Are the drivers for the nuvi installed properly? Usually there is a folder named USB, thats where the correct drivers reside, and that's where you tell the computer to look when it asks for the drivers.