Revision summary
Foreign GPS-type systems can be limited in a crisis, so India needs a regional grid it controls. NavIC covers India and a belt of about 1,500 km around it, including nearby seas. Receivers use satellite time delays to fix position; SPS is civil and a restricted service is authorised. Tropical ionosphere is handled better with more than one frequency. Public and defence users gain backup when chips read NavIC with other GNSS.
Model answer
Flow diagram
flowchart TD N[NavIC IRNSS] --> C[India plus 1500 km] F[Foreign GNSS risk] --> N N --> P[Time range position] P --> U[Ships phones survey defence]
Conclusion
- Put NavIC in more phones, AIS sets, and aircraft boxes so the public service is not only a satellite fact.
- Keep clocks, spares in orbit, and ground stations healthy, because a navigation grid fails if time is wrong.
IRNSS is needed for sovereign, regional coverage when foreign GNSS can be limited. It helps navigation by giving Indian users a timed satellite fix for civil and restricted work from the coast to the high Himalaya.
Quick related
Students also ask
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Why is India taking keen interest in the Arctic region?
Next question on this syllabus topic (2018 · Q5). View answer →
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Does NavIC replace GPS for every Indian user?
Not yet. Many devices still rely on GPS. NavIC is the sovereign regional layer and a backup when chips support it.
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Is this only a military project?
No. Fishing, disaster alerts, survey, and timing of civilian networks are designed uses along with authorised defence use.
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