Exercise Sea Vigil-26: Strengthening India’s Coastal Defence and Maritime Security

November 14, 2026

Why in News?

The fifth edition of Exercise Sea Vigil, India’s nationwide coastal defence exercise, is being conducted from 11–19 November 2026, with the Indian Navy as the lead coordinating agency.

It aims to assess preparedness and identify gaps in the country’s coastal and maritime security arrangements.

Clarification: Sea Vigil-26 is different from IMNEX-26, the eighth India–Myanmar Naval Exercise, being held at Visakhapatnam from 10–14 November 2026. The opening headline in the supplied material combines these two separate exercises.

What Is Exercise Sea Vigil?

Sea Vigil is a pan-India, multi-agency coastal defence exercise. It was conceptualised in 2018 to evaluate security measures introduced after the 26/11 Mumbai terrorist attacks.

The 2026 edition covers India’s entire coastline and Exclusive Economic Zone (EEZ), involving coastal states, Union Territories, maritime agencies and fishing communities.

Phases of Sea Vigil-26

Phase	Dates
Coastal Defence and Security Readiness Evaluation (CDSRE)	11–17 November 2026
Sea Phase	18–19 November 2026

Participants include the Indian Navy, Indian Coast Guard, Coastal Security Police, Customs and other maritime stakeholders.

The exercise is supported by ministries responsible for defence, home affairs, shipping, petroleum and fisheries. It also serves as a preparatory exercise for TROPEX—Theatre Level Readiness Operational Exercise, which addresses broader naval operational readiness.

Why Is Coastal Security Important for India?

India’s maritime geography creates both economic opportunities and security responsibilities.

1. Preventing Infiltration and Smuggling

The 26/11 attacks demonstrated how maritime routes could be exploited by terrorists. Coastal surveillance must also address the movement of narcotics, weapons and other illicit goods.

2. Protecting Critical Infrastructure

Ports, offshore energy installations, coastal industrial facilities and shipping infrastructure require coordinated protection against sabotage and other threats.

3. Securing Livelihoods and Economic Activity

Fishing, maritime trade and coastal tourism depend on safe waters. Security arrangements must therefore protect communities while allowing legitimate economic activity.

4. Coordinating Multiple Agencies

Coastal threats can cross administrative jurisdictions. Effective prevention requires shared information, compatible communication systems and clear responsibilities.

India’s coastal security measures accordingly combine patrols, technical surveillance, inter-agency coordination and participation by coastal communities.

India’s Revised Coastline: An Important Geography Update

India’s coastline has been reassessed from 7,516.6 km to 11,098.81 km, an increase of approximately 47.7% in the measured length.

The reassessment was undertaken by the National Hydrographic Office, in coordination with the Survey of India, using modern GIS tools and high-resolution data.

This does not mean India physically acquired thousands of kilometres of new coastline. More detailed measurement captures coastal curves and irregularities that earlier methods represented less precisely.

The revised figure supports better planning for infrastructure, coastal protection and disaster-risk assessment. It does not automatically change Coastal Regulation Zone boundaries.

How Is India’s Coastal Security Organised?

Institution	Broad responsibility
Indian Navy	Overall maritime security, including coastal and offshore security
Indian Coast Guard	Maritime law enforcement and coordination between central and state agencies on coastal security
State Marine/Coastal Police	Coastal policing and local enforcement within assigned jurisdictions
Customs and port authorities	Cargo-related enforcement, port security and associated responsibilities
Fishing and coastal communities	Local awareness and reporting of suspicious activities

This arrangement requires coordination rather than isolated action by individual organisations. The Coast Guard supports the Navy in ensuring maritime security while also performing its own statutory responsibilities.

What Is an Exclusive Economic Zone?

Under UNCLOS, an EEZ can extend up to 200 nautical miles from the baselines used to measure the territorial sea.

Within it, a coastal state has sovereign rights over natural resources and specified jurisdiction, including matters relating to marine scientific research and environmental protection.

Prelims distinction: An EEZ is not equivalent to sovereign land territory. Other states retain freedoms such as navigation and overflight, subject to international law.

Key Challenges and the Way Forward

Coastal security requires sustained action beyond periodic exercises. Priority areas include:

Better surveillance: Integrate coastal radar, patrol assets and vessel information.
Faster information-sharing: Ensure alerts reach the appropriate agency without delay.
Stronger local capacity: Improve training, equipment maintenance and operational readiness of coastal police.
Community participation: Maintain accessible reporting channels for fishers and coastal residents.
Infrastructure protection: Regularly assess vulnerabilities at ports and offshore facilities.
Follow-up after exercises: Convert identified shortcomings into time-bound corrective measures.

Conclusion

Sea Vigil-26 provides an opportunity to test how India’s coastal security institutions function together. Its lasting value will depend on whether lessons from the exercise improve surveillance, coordination and response capabilities.

Mains Practice Question:
“Effective coastal security requires institutional coordination and community participation alongside technological surveillance.” Discuss in the context of Exercise Sea Vigil. (150 words)