India's own regional navigation system is called the Indian Regional Navigation Satellite System (IRNSS), also known as NavIC. It was launched in seven phases, and the last satellite was launched in 2018.

The first satellite in the IRNSS constellation, IRNSS-1A, was launched on July 1, 2013. The remaining six satellites were launched in pairs over the next five years. The final satellite, IRNSS-1G, was launched on April 28, 2018.

The IRNSS constellation is made up of seven satellites in geosynchronous orbit. This means that the satellites remain in the same position relative to the Earth, which allows them to provide continuous coverage of the Indian region.

The IRNSS system provides a number of different services, including:

• Positioning: The IRNSS system can be used to determine the position of a user with an accuracy of up to 20 meters.
• Timing: The IRNSS system can be used to provide accurate timekeeping, which is essential for a variety of applications, such as air traffic control and banking.
• Messaging: The IRNSS system can be used to send short messages, which can be used for a variety of purposes, such as disaster relief and fleet management.

The IRNSS system is an important asset for India. It provides accurate positioning, timing, and messaging services to users in the Indian region. The system is also being used to develop a variety of new applications, such as autonomous vehicles and precision agriculture.

In total, 7 IRNSS satellites were launched to complete India's own navigation system. The system is now fully operational and providing services to users in India and the surrounding region.