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Depending on the kind of information updated, map updates can be free or for purchase.
In a rapidly changing world, a GPS device is only as good as its data.
As streets and highways change, updated maps are vital to keeping your GPS device useful.
If your Magellan GPS is behaving erratically, whether it fails to respond or update maps, or freezes, resetting it reboots the device to restore normal operations.
The more you use your GPS, the greater likelihood that it will run into minor problems, so performing a reset is necessary.