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Hi. I just bought an in-car charger for the 7211 on ebay. It is 5v with a 2amp flow. It's not for the mini-USB port on the side but for the dc input hole on the other side. I've just plugged it into my laptop via the mini-USB port to see if it will charge that way but it doesn't seem to be doing. Hope this helps.
Is the Flip-Up antenna UP? Can the unit 'see' the Sky? - Most only work near the front windshield.poorly everywhere else in the car. The layers of car metal blocks or attenuates (cuts down/reduces) the satellite signals. Also, there might be a MENU option to enable/disable GPS. If you get no joy, could be the connection to the antenna is bad/broken. If all else fails, look for a tiny hole somewhere on the outside of the case and press into it gently with apaperclip. Good Luck