You should search for an online shop.and contact them for help.recommand here for a reference.http://www.oemcargps.com a online shop about car gps
You need to navigate
to the Horizon Navigation Online Shop (see Resources for the
appropriate download page). Click on the Jensen manufacturer link
located on the left menu pane. Choose your particular Jensen GPS model
from the menu selection.
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Choose the coverage area you wish to update your GPS unit with and choose to download the map updating software or have the software sent to you through the mail in DVD form. Fill out the order form information including your payment method (Visa, MasterCard or American Express are the only payment methods accepted). When you receive the updated software by either download or mail, install the software on your computer.
Follow the instruction prompts provided by the Navmate utility program with regard to updating your particular Jensen GPS unit's map software.
Hope helps.
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