The 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). The standard is published and maintained by the United States National Geospat
![World Geodetic System - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/fc124fa2f5e06b6c1d46154d21cf57bd2057e4da/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2F4%2F4c%2FAzimutalprojektion-schief_kl-cropped.png)