Before revision: , four global systems are operational: the United States's Global Positioning System (GPS), Russia's Global Navigation Satellite System (GLONASS ) , China's BeiDou Navigation Satellite System (BDS), and the European Space Agency's Galileo.
After revision: , five), India's Navigation in Indian Constellation (NavIC global systems are operational: the United States's Global Positioning System (GPS), Russia's Global Navigation Satellite System (GLONASS ) , China's BeiDou Navigation Satellite System (BDS), and the European Space Agency's Galileo.