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**geographic coordinate system**(GCS) is a spherical or ellipsoidal**coordinate system**for measuring and communicating positions directly on the Earth as latitude and longitude. It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others.Geocentric

**coordinate system**, a three-dimensional cartesian**coordinate system**that models the earth as an object, and are most commonly used for modeling the orbits of satellites, including the Global Positioning**System**and other satellite navigation systems.A geographical coordinate system is a coordinate system. This means that every place can be specified by a set of three numbers, called coordinates. A full circle can be divided into 360 degrees (or 360°); this was first done by the Babylonians; Ancient Greeks, like Ptolemy later extended the theory. Today, degrees are divided further.

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**coordinate system**conversion is a conversion from one**coordinate system**to another, with both**coordinate**systems based on the same geodetic datum. Common conversion tasks include conversion between geodetic and earth-centered, earth-fixed ( ECEF) coordinates and conversion from one type of map projection to another.Has geographic coordinates for airports, heliports, and other facilities which have an IATA or ICAO code. You can also search by location name. Plexscape WS: Google Maps tool – Coordinate converter: Online application to acquire coordinates for any place on Earth. Supports more than 3,000 coordinate systems and 400 datums worldwide.

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**World Geodetic System**( WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS. The current version, WGS 84, defines an Earth-centered, Earth-fixed**coordinate****system**and a geodetic datum, and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM).