System Global Navigation Satellite (GNSS) system are to the receptors of small allow your position (length, width and height of the geo) with the error a few yards specified. This functionality through the transmission of radio waves between the device and satellite. Stations fixed ground are able to calculate very accurate time for scientific experiments.
now, the only System, Global Positioning (GPS), all the Enable belonging to the United States that NAVSTAR is called. (GLONASS) of Russia, the reconstruction is up to the state of all of the active return. China has declared the year 2015 Positioning System, the local Beidou system with global navigation, the COMPASS combined. Navigation system the European Union with the name of The (Galileo) in the development stage and is on schedule have 2013 active.