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You can not update the official Navman maps on this device. You can however
unlock the iCN520 and install other GPS software on it. The iCN520 can run virtually all the major GPS software available today; from Tomtom to Miomap and beyond.
how to unlock the iCN520 can be found at:
check the battery switch on the back. you will need a pen. Mine does the same thing. I believe this switch has to be set to ON for it to work. At least mine wont turn on unless the switch is turned on.
The CD is not available for download from Navman it seems, but you can get it at thepiratebay.com. Just search for 'navman icn' and you'll find what you need, I just did. Better learn how to download torrents though! :)