UPSC Prelims 2025 · Question 54 of 100

UPSC Prelims 2025 question on GAGAN Augmentation System

GPS-Aided Geo Augmented Navigation (GAGAN) uses a system of ground stations to provide necessary augmentation. Which of the following statements is/are correct in respect of GAGAN?

I. It is designed to provide additional accuracy and integrity.

II. It will allow more uniform and high quality air traffic management.

III. It will provide benefits only in aviation but not in other modes of transportation.

Select the correct answer using the code given below.

  1. I, II and III
  2. II and III only
  3. I only
  4. I and II only
Show answer

Answer: D. I and II only

Verdict

Statements I and II are correct → Option (d).

Analysis

GAGAN (GPS-Aided Geo Augmented Navigation) is a Satellite Based Augmentation System (SBAS) for the Indian Airspace, implemented by ISRO and AAI.

Statement by statement

Statement I – CORRECT: GAGAN is designed to enhance the accuracy and integrity of GPS signals over the Indian airspace. It improves positioning accuracy from about 20 meters to 1–2 meters. Hence Statement I is correct.

Statement II – CORRECT: GAGAN improves navigation reliability, allowing for more uniform and efficient air traffic management, especially in complex or busy airspace. Hence Statement II is correct.

Statement III – INCORRECT: Although developed primarily for aviation, GAGAN also benefits other sectors like railways, road transport, maritime navigation, agriculture, and disaster management. It is not limited to aviation only. Hence Statement III is not correct.

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