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Title: Don't update it unless you live in Guam.
Review: Got mine as a gift and after using it once, I decided to use the map update feature. It wiped out all of my USA and Canada maps and installed Guam. Customer service was a hastle since they wouldn't help me until I faxed a copy of my receipt which I didn't have. Since I had to go the trouble of getting the receipt, I figured it was easier just to return the piece of junk.
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