GPS (Global Positioning System) signals are not always pin-point accurate and are susceptible to factors and disturbances such as ionospheric interference, the location of the moving vehicle, and even the functioning of the GPS satellite, signal availability, etc.

What is ISRO's 'Gagan', which can aid GPS and enable precise navigation of aircraft?

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What is ISRO's 'Gagan', which can aid GPS and enable precise navigation of aircraft?