This visual information can be displayed on a video screen, such as those used in automobiles and airplanes. Position data is transmitted via radio signals to ground-based devices, or transceivers, that receive position information from three or more satellites and convert that data, using specialized software, into visual information. WGS84's coordinate origin is the center of the Earth. These satellites use the World Geodetic System, known as WGS84, as its reference coordinate system. Each one is referred to as a bird and uses radio waves to communicate with other satellites to determine an exact location on the earth. Orbiting above the earth's surface at precise positions is a satellite constellation of 24 GPS satellites. Longitude coordinates measure distance east and west from the prime meridian. Latitude coordinates measure distance north and south from the equator. In the numeric format, the minus sign before the second number indicates that the location is west of the prime meridian a minus sign in front of the first number would indicate degrees south of the equator. That same information can be expressed in a purely numeric format: Below are the coordinates for the Empire State Building in New York City: GPS coordinates are expressed in two different formats. The prime meridian, located in Greenwich, UK, is 0 degrees longitude, and the lines of longitude coordinates are measured according to 90 degrees east and west from that point. The north pole and south pole are at 90 degrees in either direction. Lines of latitude coordinates measure degrees of distance north and south from the equator, which is 0 degrees. GPS coordinates are usually expressed as the combination of latitude and longitude. GPS coordinates are a unique identifier of a precise geographic location on the earth, usually expressed in alphanumeric characters.Ĭoordinates, in this context, are points of intersection in a grid system. What are GPS (global positioning system) coordinates?
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