Q 4.4 What are examples of satellite navigation system?

Global Positioning System (GPS): US Government
Global Navigation Satellite system (GLONASS): Russian Federation
[Note this is an English language translation of the Russian Acronym]
Galileo (In development): European Union
BeiDou: China (Regional system with plans to expand to a global system by 2020)
Indian Regional Navigational Satellite System (IRNSS), an Indian satellite navigation system in development
The Quasi-Zenith Satellite System (QZSS), is a proposed Japanese three-satellite regional system in development (undergoing trials as in first quarter 2018)

Besides, there are several Satellite-based augmentation systems in operation, which enhance the availability, reliability and accuracy of the GPS system.