As of March 2026, how many functional satellites does NavIC have, and what is the minimum needed for reliable 3D positioning?

3 functional, minimum 4 needed. Three NavIC satellites can give navigation signals, and four are the minimum for a standalone position fix. The government told Parliament in July 2026 that these three are IRNSS-1B, IRNSS-1I and NVS-01. Official counts call eight satellites functional, because five can send one-way messages. Timing still works. Read more: SciTech0014 — Navigation Technology.

Which one of the following countries has its own Satellite Navigation System? (UPSC 2023)

Japan. Japan runs QZSS, also called Michibiki. It complements GPS over Japan and the Asia-Oceania region. The official UPSC key for Series A gives (d). Read more: SciTech0014 — Navigation Technology.

How far beyond India's boundary does NavIC's primary service area reach?

About 1,500 km. ISRO says the service area includes India and a region up to 1,500 km beyond its boundary. UPSC 2018 gave this figure wrongly as "5500 sq. km" in a statement. The reach is a distance, not an area. Read more: SciTech0014 — Navigation Technology.

Why does a satellite navigation receiver need signals from at least four satellites?

Three satellites fix the position and the fourth corrects the receiver's clock. Three distances fix longitude, latitude and altitude. The receiver's own clock is cheap and not exact. A fourth signal lets it correct that clock error. ESA calls four the absolute minimum. Read more: SciTech0014 — Navigation Technology.

How is GAGAN different from NavIC?

GAGAN corrects GPS signals for aviation, while NavIC is a separate system with its own satellites. GAGAN is a satellite-based augmentation system built by AAI and ISRO. It takes GPS data and sends corrections through geostationary satellites. NavIC has its own constellation and its own signals. Read more: SciTech0014 — Navigation Technology.

What did the government tell Parliament in December 2025 about NavIC in smartphones?

It had not mandated NavIC yet, and talks were on. The Department of Space said the government had not mandated NavIC yet and discussions were ongoing. It also said more than 60 phones from several makers support NavIC. A 2023 plan for 5G phones from January 2025 had not become a rule by December 2025. Read more: SciTech0014 — Navigation Technology.

How are the seven satellites of the NavIC design placed?

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