Indian Navy Acquires 500 Sonobuoys

September 10, 2024

The Indian Navy has taken a major step to strengthen its anti-submarine warfare (ASW) capabilities by purchasing 500 sonobuoys for $52.8 million (around Rs 436 crore). These sonobuoys will be used with the Sikorsky MH-60R helicopters. This purchase came at the same time as Defence Minister Rajnath Singh’s discussions in Washington, where the US approved a potential military sale to India.

This purchase is important because it helps India counter the growing naval activity of China in the Indian Ocean, especially the increased presence of Chinese submarines. To keep an eye on these submarines and respond if needed, the Indian Navy needs to improve its ability to detect and track submarines underwater.

What are Sonobuoys?

Sonobuoys are devices used in the ocean to detect submarines. India requested three types of sonobuoys, each with different functions:

AN/SSQ-53G Sonobuoy

Technology: This sonobuoy uses a system called DIFAR (Directional Frequency Analysis and Recording).
Function: It passively listens for underwater sounds, without sending out any signals, making it stealthy.
Depth: Can work up to 300 meters underwater.
Additional Features: It allows the Navy to change settings electronically for flexibility.

AN/SSQ-62F Sonobuoy

Technology: This one uses DICASS (Directional, Coherent, Active Sonar System).
Function: It sends out sound waves and listens for the echoes to locate objects, including submarines.
Depth: Can operate up to 460 meters underwater.
Additional Features: It has GPS to accurately track locations.

AN/SSQ-36 Sonobuoy

Function: This sonobuoy measures the temperature and speed of sound in water, which helps improve the accuracy of other sonobuoys.

With these new sonobuoys, the Indian Navy will have stronger tools for detecting and tracking submarines. The mix of passive and active sonar systems, GPS, and environmental data collection will make it easier to monitor underwater threats, especially from submarines, and respond if necessary.

Strengthening US-India Relations

This purchase is also part of a growing strategic partnership between India and the US, especially in the Indo-Pacific region. Both countries are working together to ensure maritime security in response to challenges in the region.

About Sikorsky MH-60R Helicopters

The Sikorsky MH-60R Seahawk, often called “Romeo,” is a naval helicopter designed for both anti-submarine and anti-surface warfare. It is equipped with advanced sonar systems like the AN/AQS-22, and can reach speeds of 160 knots with a range of 250 nautical miles. This helicopter is known for its stability and versatility, making it ideal for detecting and engaging submarines.

By acquiring these sonobuoys, the Indian Navy is not only improving its submarine detection skills but also strengthening its ties with the US for regional security.

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