PZ-90 geodetic system

From International Dictionary of Marine Aids to Navigation
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A consistent set of parameters used in GLONASS describing the size and shape of the Earth, positions of a network of points with respect to the centre of mass of the Earth, transformations from major geodetic datums and the potential of the Earth, developed in 1990.

Source: Nick Ward, Vicechair, IALA e-Nav Committee, March 2009

Global Navigation Satellite System, operated by the Government of the Russian Federation

Globalnaya Navigatsionnaya Sputnikovaya Sistema

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM