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Unfortunately the Audiovox NVX225 (which was also marketed under the identical model number for the Jensen brand name) has too date not had any map updates made available. For whatever reason the manufacturers never got around to updating their maps after selling these, as well as many other units to consumers. If you take a look on the Internet there are all kinds of forums and help sites that are full of people complaining about the fact that their GPS units are over 5 years old and have never been updated. Even with all of these complaints made public the companies still chose to not make the updates available.
There are websites that will give you files to download that will completely replace your GPS operating system and then allow you to download and install update map information that they have created. The real drawback to that is there is no guarantee the hack will work and it could render your unit totally unusable. Should you decide this is something you want to try you can do a Google search for your model number and the word hack. You will then be given a number of websites that will have the hack files available.
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.
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.