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The geometric shape of the reference system for the satellite navigation system NAVSTAR/GPS, defined as WGS 84, is:
  • A
    a sphere
  • B
    a geoid
  • C
    a mathematical model that describes the exact shape of the earth
  • D
    an ellipsoid

It wasn’t until the mainstream use of Global Positioning Systems (GPS) when geodesists first developed a unified global ellipsoid model.

The radio waves transmitted by GPS satellites and trilateration enable extremely precise Earth measurements across continents and oceans. This led to the development of global ellipsoid models such as WGS72, GRS80 and WGS84 (current). 

The World Geodetic System (WGS84) is the reference coordinate system used by the Global Positioning System. The error of WGS84 is believed to be less than 2 centimeters to the center mass.

Note: for more information and curiosity about the WGS84 go to https://epsg.io/4326

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