Many also include Alaska, Hawaii, Canada, and Puerto Rico.
Additional maps for travel abroad can be purchased from some manufacturers, typically for to 0.
Function varies, though better units track trip progress by recording data on distance traveled, average speed, and time spent that can be recalled later.
This information may appeal to business travelers for monitoring expenses.
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This is the map coverage provided by the navigation system that is available to use right out of the box.
All tested units include at least the 48 contiguous United States.
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Some units will indicate on the map if roads had been traveled previously.