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