My Nextar GPS doesn't hold a charge and I'm not sure how to update my nextar GPS
Your battery most likely has cell dammage, this prevents the battery from holding any acceptable charge. You can take the device to a batteries plus and they might be able to refresh the battery to hold an charge, if under a year, send back to the manufacturer. Since you did not provide a model number there are different ways to update the GPS, here is the company support site.
http://www.nextar.com/frontend/gps_navigation_systems.asp
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