Why do we need satellites for GPS?

You need four satellites because each data from one satellite put you in a sphere around the satellite. By computing the intersections you can narrow the possibilities to a single point. Three satellites intersection places you on two possible points. The last satellite give you the exact location.

What is Irnss satellite used for?

IRNSS is an independent regional navigation satellite system being developed by India. It is designed to provide accurate position information service to users in India as well as the region extending up to 1500 km from its boundary, which is its primary service area.

Why is Irnss required for UPSC?

The IRNSS System provides navigation solution all time with position accuracy better than 20m during all weather conditions, anywhere within India and a region extending about 1500 km around India.

What is the difference between GPS and NavIC?

Navic is the operational name of the Indian Regional Navigation Satellite System (IRNSS) developed by ISRO. Unlike GPS which is a Global tracking constellation, Navic has been designed to focus especially on India and adjoining regions (1500 Kms around India) and is a very significant achievement for the country.

Is IRNSS a communication satellite?

IRNSS is used for ground, aerial and marine navigation, disaster management, mobile phone integration, mapping and visual & voice navigation for drivers, among others. Definition: Intelsat, S.A. is a leading provider of communication satellite services.

Is IRNSS a global navigation system?

IRNSS is a regional and not a global navigation system. With the recognition as a component of the WWRNS, the Indian navigation system is similarly placed as Global Positioning System (GPS – USA), most commonly used by marine shipping vessels across the world or the Russian Global Navigation Satellite System (GLONASS).