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In the product manual it indicates there is a SD card slot, along with a USB port, so there is a physical method to change the map data to your locale. http://www.nextar.com/images/Product/W3G-01%20hardware%20manual-english.pdf
However, you should contact the manufacturer to see if their firmware allows you to change/add maps. Garmin GPS units have this capability, and I have used their topo & Road maps together with very good results for off-road adventures out in AZ & Utah.
Get a blank card, put it in your gps device, connecct to your computer, go to their website and download the maps you need. Mine stores everything inside itself. You might not even need the card. Just load the maps into the gps.
hit setup...then under AV setup...click over to the 3rd screen...and it should give you options for navagtion volume and and options for muting and overiding the sounds comming from the speakers either front left, right or both....
I HAVE A SIMILAR PROBLEM WITH MY W3G-01. THE ERROR MESSAGE READS; CANNOT FIND MAP DATAFILES. PLEASE MAKE SURE THE STORAGE CARD IS PROPERLY INSERTED. I HAVE REMOVED CARD AND REINSURTED IT AND THE MESSAGE REAPPEARS.
There is no PC interface, the USB cable was included should there be any downloadable firmware updates. There are none and they will provide appropriate drivers for the GPS if and when they are available. Updates will be listed in their Support web when available.