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If you need to update your maps, check this site for downloading instructions and downloadable ISO files for installing the more current maps. They may or may not be free, depending on your previous map purchases. They also sell the upgrade software, but its a little pricey. They are located in Australia.
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:
No problem for any Navman user manual - go to navman.com/ - the site is 'Navman - beyond navigation' - click on 'UK' - on the right hand side of the page click on 'user manuals' - the manuals are there for all models ever made, in all languages - scroll down to the manual you require, click on and download or print off - easy...