Www.dualav.com They don't offer a whole lot of info. To see the manual for this go to their web page and then click on "navigation" under the "mobile video" tab. You can check for map updates under the "download" tab, but don't expect to see any.
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if any updated map software is avail it must come from the maker of the GPS, in attempt to use other Map software will look up the programming and make the GPS useless, contact the manufacturer's support web site for more information
I had the same problem, check the fuse, also if the fuse is blown check the piece that fits into the device, you may have lost the little part that stops the fuse from blowing, it looks like a small ring on the end, stops it from shorting.
Does anyone know where I can purchase a NavAtlas 3550 cigarette lighter charger? I have tried 2 Universal adapters and none work! HELP!!