That's usually called- a chart.
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how navigators and sailors
There are many different brands of GPS navigators on the market today.TomTom, Magellan, and Garmin are currently three of the large sellers of GPS navigators. Many cell phones are now equipped with GPS navigators as well.
topographic map
a map key
The arrow pointing upward on a map is called a compass rose. It indicates the direction of north on the map.