Map data is a set of digital information that a GPS unit uses to represent things such as streets, railroads, airports, parks, rivers, and lakes.

Map data in most automotive systems shows the location of roads, addresses, and other points of interest. It can also include details such as speed limit, time limitations (closed to traffic during certain hours of the day), and mid-road barriers (which only allow you to turn one direction from a side street).

Maps for many GPS models are built from data maintained by NAVTEQ or TeleAtlas.

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