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Visit TomTom.com

To update the software and maps on your TomTom GPS, you'll first need to visit TomTom.com and download the TomTom Home software.
Updated:Caption:Photo:Antuan Goodwin/CNET
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Install and run TomTom Home

With the application installed, you'll see that you're presented with a number of options and functions to upgrade and customize your TomTom device.
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Connect via USB

Using its included USB sync cable, connect your TomTom GPS device to your PC or Mac and power the unit on. After a few seconds, you should be asked whether to connect to your computer. Tap yes.
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Latest map guarantee

If your device is new enough, you may be eligible for TomTom's latest map guarantee that gives you one free map update within 30 days of the purchase of a new TomTom device. Our XL 340 S Live was outside of the window of opportunity.
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Choose your update

Click the Add Maps button and you'll be taken to this list of available map updates for your particular unit. Users can update their current maps or add new areas, for example European map data for an intercontinental vacation.
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Download and install

With your map chosen, you'll be prompted for a method of payment, after which your maps will be available for downloading and installation. A full map update can take as long as an hour to download and be flashed to your GPS device. You shouldn't unplug your GPS device during this time, so be sure to allot plenty of time.
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Other updates

With your new maps installed, head back to TomTom Home's main menu and select "Update my device" to check for other updates, including fuel price data, TomTom Map Share corrections, and software updates.
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