The GPS maps required for a car navigation system are very detailed. In addition to the need for highly accurate maps, the map database must store a lot of data about roads and highways. This information includes speed limits, names and road numbers of all streets, one way streets, expressway ramp details, among many other details.
Not even the most current maps are perfect. There will be a few errors in addresses, road names, road placement, and some roads may be missing. Most of the time, the maps are quite accurate. NavTech is one of the best map publishers. They are used in Garmin and Magellan, as well as some other brands.
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