Coastal & Maritime Security in India

Three-Tier Coastal Security Architecture · Maritime Zones & Threats · IMAC, NC3I, NMSC · SAGAR to MAHASAGAR Vision 2025 · Op Sankalp in the Gulf of Aden

📄 GS Paper 3🎯 Mains Focus⏱ 16 min read📅 Updated June 2026

Significance of Coastal & Maritime Security

India is fundamentally a maritime nation. A long peninsular coastline juts into the Indian Ocean — the world's busiest energy and trade highway — placing India astride critical Sea Lines of Communication (SLOCs). Coastal security (the protection of the shoreline, harbours and littoral approaches) and maritime security (the protection of the wider sea space, ports, shipping, offshore assets and marine resources) together form a single continuum that is vital to national security and the economy.

7,516 km coastline spanning the mainland and island territories.
13 coastal States & Union Territories bordering the sea — from Gujarat in the west to West Bengal in the east, plus the Andaman & Nicobar and Lakshadweep island groups.
1,382 islands (including the strategically vital Andaman & Nicobar archipelago that dominates the approaches to the Strait of Malacca).
~2.4 million sq km Exclusive Economic Zone (EEZ) — a vast resource frontier for fisheries, hydrocarbons and seabed minerals (the blue economy).
~95% of India's trade by volume (and roughly 70% by value) moves by sea, making maritime trade the lifeline of the economy.
Energy security: the bulk of India's crude oil imports transit the Indian Ocean Region (IOR) through chokepoints such as the Strait of Hormuz and the Bab-el-Mandeb.

Key distinction: Coastal security guards the near-shore zone — the shoreline, fishing harbours and territorial waters where landward and seaward threats meet. Maritime security is broader, covering the EEZ, the high seas, SLOCs, offshore installations and the marine environment. The 26/11 Mumbai attacks (2008) exposed how a gap in coastal security can become a national internal security catastrophe.

Figure 1: The three-tier coastal security structure overlaid on India's maritime jurisdiction zones (Territorial Waters 12 nm, Contiguous Zone 24 nm, EEZ 200 nm).

Evolution of the Coastal Security Architecture

India's coastal security framework is best understood as a story of "before" and "after" 26/11 — the 2008 Mumbai terror attacks in which ten Lashkar-e-Taiba terrorists infiltrated by sea, hijacking a fishing trawler (the Kuber) to reach the Mumbai coastline undetected.

Pre-26/11 Gaps

No unified or dedicated coastal security mechanism; the sea was treated as a "soft" flank.
Multiple agencies with overlapping mandates and no clear lead, leaving accountability diffuse.
Negligible surveillance of the near-shore zone; fishing harbours and landing points were unmonitored.
The Coastal Security Scheme (Phase-I), launched in 2005, had only begun to stand up coastal police stations.

Post-26/11 Overhaul

Three-tier security system formalised: Indian Navy (overall responsibility for maritime security, including offshore and coastal security) → Indian Coast Guard (territorial waters and EEZ) → State Marine/Coastal Police (shallow coastal waters).
Navy designated lead agency for overall maritime security; the Director General Coast Guard made responsible for coastal security in territorial waters.
Sagar Prahari Bal: a specialised ~1,000-strong Navy force with fast interceptor craft to protect naval bases, dockyards and vital coastal installations.
Coastal Security Scheme Phase-II (2011) and Phase-III expanded coastal police stations, jetties, interceptor boats, and four-wheel/two-wheel vehicles for the marine police.
National Committee for Strengthening Maritime and Coastal Security (NCSMCS) set up under the Cabinet Secretary for inter-ministerial coordination.
Surveillance infrastructure: a coastal radar chain, AIS (Automatic Identification System) and the NC3I network were rolled out to build Maritime Domain Awareness (MDA).

Exam angle: Whenever a question asks about coastal security challenges or 26/11 lessons, structure the answer as pre-26/11 gaps → post-26/11 reforms → residual gaps → way forward. This shows both knowledge and critical analysis.

The Three-Tier Structure in Detail

The architecture is a layered, depth-based defence in which responsibility shifts seaward from the coast to the high seas. Each tier has a defined zone but the tiers overlap by design to ensure no gap is left unwatched.

Tier	Agency	Primary Zone	Core Role
Tier 1 (Seaward / outermost)	Indian Navy	High seas, EEZ & offshore; overall maritime security	Lead agency for maritime security; deep-sea patrol, deterrence, war-fighting
Tier 2 (Mid-sea)	Indian Coast Guard (ICG)	Territorial waters (12 nm) & EEZ (200 nm)	Coastal security in territorial waters; anti-smuggling, anti-poaching, SAR, marine pollution response
Tier 3 (Inshore / shallow)	State Marine / Coastal Police	Shallow coastal waters up to 12 nm	Patrolling near-shore waters, fishing harbours, landing points; first responders ashore

Indian Navy

Has overall responsibility for maritime security, including coastal and offshore security, as the apex tier.
The Director General Coast Guard was additionally designated as the Commander Coastal Command, responsible for overall coordination of coastal security.
Operates Joint Operations Centres (JOCs) at Mumbai, Visakhapatnam, Kochi and Port Blair to coordinate the three tiers.

Indian Coast Guard (ICG)

Established 1978 under the Coast Guard Act 1978; an armed force of the Union under the Ministry of Defence.
Guards the territorial waters and the EEZ — anti-smuggling, anti-poaching, protection of offshore assets, search-and-rescue, and marine environment protection.
Maintains the coastal radar chain and runs awareness programmes with the fishing community.

State Marine / Coastal Police

Operates in shallow coastal waters up to 12 nm under the Coastal Security Scheme.
Patrols fishing harbours, jetties and landing points — the "last mile" where infiltration is most likely.
Often under-resourced: shortages of trained personnel, seaworthy boats, fuel and maintenance plague many states.

Issues in the Existing Architecture

Despite the post-26/11 overhaul, structural and operational weaknesses persist, repeatedly flagged by parliamentary committees and the CAG.

Jurisdictional overlaps & turf issues: The Navy, Coast Guard, marine police, Customs, port authorities and fisheries departments all operate in the littoral, but coordination remains uneven and accountability gets diffused.
No single central coastal authority: There is no unified statutory body with command over all coastal security agencies; the NCSMCS is a coordination committee, not a command structure.
Fishermen identity & vessel registration: Issuing biometric ID cards to ~marine fishermen and registering/transponder-tagging the vast fleet of small fishing boats remains incomplete, leaving a large "blind spot" in the inshore zone.
Manpower & equipment gaps: Marine police stations face shortages of seaworthy interceptor boats, crews trained in seamanship, fuel budgets and maintenance support; many boats lie idle.
Surveillance blind spots: Gaps in radar coverage, especially in island territories and creek areas (e.g., the Sir Creek / Sundarbans), and limited night/all-weather monitoring.
Coordination of maritime security: A long-standing demand for a unified maritime security coordination apparatus led to the creation of the National Maritime Security Coordinator (2022), but full integration of the dozen-plus stakeholders is still a work in progress.

Way forward keywords: a unified coastal security command, complete fishermen biometric ID and vessel transponder coverage, plugging radar gaps, dedicated marine-police cadre with proper boats and training, and seamless intelligence fusion through the NC3I/IMAC network under the NMSC.

Figure 2: The maritime threat spectrum — from traditional terrorism and piracy to emerging drone/missile attacks on shipping and great-power naval competition.

Maritime Security — Elements, Importance & Threats

Elements of Maritime Security

Sea Lines of Communication (SLOCs): the maritime trade and energy routes that must be kept open and safe.
Ports & harbours: critical nodes whose disruption cascades through the economy.
Offshore assets: oil and gas platforms (e.g., Bombay High), undersea cables and pipelines.
Fisheries & the blue economy: livelihoods of millions and a vast protein and resource base.
Marine ecology: coral reefs, mangroves and the marine environment, whose degradation is itself a security concern.

Why Maritime Security Matters

Trade: ~95% of trade by volume is seaborne — any disruption directly hits the economy.
Energy: the IOR carries the bulk of India's oil imports; chokepoints (Hormuz, Bab-el-Mandeb, Malacca) are vulnerabilities.
Strategic primacy in the IOR: India aspires to be the "net security provider" and "first responder" in the Indian Ocean Region.

Threats to Maritime Security

Piracy: resurgent off the Somali coast and in the Gulf of Aden; threatens commercial shipping and seafarers.
Terrorism via the sea: the 26/11 model of seaborne infiltration of terrorists and weapons.
Smuggling & trafficking: arms, narcotics (the Indian Ocean drug corridor), gold and FICN; human trafficking.
Illegal, Unreported & Unregulated (IUU) fishing: depletes resources, harms livelihoods and masks other illicit activity.
Chinese naval presence & the "String of Pearls": PLA-Navy deployments in the IOR, "research/survey" vessels, and a network of ports (Gwadar, Hambantota, Chittagong, Djibouti base) that strategically encircle India.
Drone & missile attacks on shipping: the 2023–24 Red Sea / Gulf of Aden crisis (Houthi attacks) demonstrated a new threat to merchant vessels and crews.

Agencies & Institutions for Maritime Security

Maritime security in India is a multi-agency enterprise. Beyond the three operational tiers, a web of intelligence-fusion, surveillance and coordination institutions has been built up since 26/11.

Agency / Institution	Role
Indian Navy	Lead agency for overall maritime security; deep-sea operations, deterrence, MDA
Indian Coast Guard (ICG)	Coastal security in territorial waters & EEZ; anti-smuggling, SAR, pollution response
IMAC (Information Management & Analysis Centre)	The nodal centre at Gurugram for fusing maritime data; the hub of the NC3I network (set up after 26/11, operational 2014)
NC3I Network	National Command Control Communication & Intelligence network — links coastal radar stations, Navy & Coast Guard for real-time maritime picture
National Maritime Domain Awareness (NMDA)	Whole-of-government framework for a common operating picture across all maritime stakeholders
National Maritime Security Coordinator (NMSC)	Apex coordinator created in 2022 to synergise maritime & coastal security across the Navy, ICG, ministries and coastal states; functions under the NSCS
NSCS (National Security Council Secretariat)	Provides strategic oversight; the NMSC reports into the national security architecture
Sagarmala Programme	Port-led development; modernises ports & coastal infrastructure (security spin-off via better surveillance & connectivity)
State Marine Police	Inshore patrolling, harbours and the "last-mile" coast

Mnemonic to recall the fusion stack: Radars → NC3I network → IMAC (fusion hub) → feeds NMDA (common picture) → coordinated by the NMSC under the NSCS. This single chain answers most "maritime architecture" sub-questions.

Figure 3: From sensors to strategy — coastal radars feed the NC3I network and IMAC fusion hub, building NMDA, coordinated by the NMSC under the NSCS, with the Navy, ICG, marine police and other stakeholders plugged in.

India's Maritime Vision — SAGAR to MAHASAGAR

India's strategic outlook on the seas has matured from a coastal-defence mindset to an ambition of regional leadership and a free, open, inclusive Indo-Pacific.

SAGAR — Security and Growth for All in the Region (2015): articulated at Mauritius, India's flagship maritime doctrine combining security cooperation, capacity-building, sustainable blue-economy growth and the role of a "net security provider" in the IOR.
MAHASAGAR (2025): the upgraded vision — Mutual and Holistic Advancement for Security and Growth Across Regions — unveiled in 2025, broadening SAGAR from the Indian Ocean to a wider Global South / cross-regional partnership framework.
Indo-Pacific & the Indo-Pacific Oceans Initiative (IPOI, 2019): India's framework for a rules-based, cooperative maritime order across seven pillars (maritime security, ecology, resources, capacity-building, disaster risk, S&T, connectivity).
QUAD maritime cooperation: India, US, Japan, Australia — the Indo-Pacific Maritime Domain Awareness (IPMDA) initiative to track "dark shipping" and illegal fishing.
IORA (Indian Ocean Rim Association): the principal multilateral forum for IOR cooperation, where India plays a leading role.
IMEC — India-Middle East-Europe Economic Corridor: the 2023 connectivity initiative linking India to Europe via the Gulf, with major maritime legs reinforcing India's trade and strategic reach.

Exam angle: Frame India's role as moving from "coastal defence" → "net security provider in the IOR" → "preferred security partner / first responder in the Indo-Pacific." Anchor it in SAGAR (2015) updated to MAHASAGAR (2025).

Current Affairs Snapshot (up to June 2026)

National Maritime Security Coordinator (NMSC): created in 2022, the office has become the apex node for synergising maritime & coastal security across the Navy, ICG, ministries and coastal states.
Anti-piracy & anti-drone operations (2023–24): amid the Red Sea / Gulf of Aden crisis, the Indian Navy deployed a large flotilla in the Arabian Sea and Gulf of Aden under a renewed Operation Sankalp, escorting merchant vessels, responding to Houthi drone/missile strikes and hijack attempts, and conducting high-profile rescues (e.g., the MV Ruen and MV Lila Norfolk interventions), reinforcing India's "first responder" credentials.
SAGAR → MAHASAGAR (2025): the maritime vision was formally upgraded to MAHASAGAR in 2025, widening the cooperative framework to the Global South.
IMEC corridor: progress on the India-Middle East-Europe Economic Corridor strengthens India's maritime-trade architecture and Indo-Pacific connectivity.
Chinese activity in the IOR: continued presence of PLA-Navy units and survey/research vessels keeps maritime-domain awareness and the "String of Pearls" challenge high on the agenda.
Coastal security exercises: pan-India coastal defence exercises ("Sea Vigil") continue to test the three-tier system and inter-agency coordination.

Previous Year Questions — Mains with Model Answer Structures MAINS

How to use: Each model answer is a structured outline. Flesh out each point into 2–3 sentences in the exam. This is a Mains-only subject — PYQs are covered up to UPSC Mains 2025.

UPSC GS3 2022 10 marks · 150 words

Q. "What are the maritime security challenges in India? Discuss the organisational, technical and procedural initiatives taken to improve the maritime security."

Model Answer Structure

Intro: Note India's stake — 7,516 km coastline, ~95% trade by sea, vast 2.4 million sq km EEZ; define maritime security.
Challenges: Seaborne terrorism (26/11), piracy (Gulf of Aden), smuggling & narco-trafficking, IUU fishing, Chinese naval presence / String of Pearls, drone-missile attacks on shipping.
Organisational initiatives: Three-tier system (Navy → ICG → marine police), Sagar Prahari Bal, NCSMCS, and the NMSC (2022).
Technical initiatives: Coastal radar chain, AIS, NC3I network, IMAC fusion hub, NMDA, satellite surveillance.
Procedural initiatives: Coastal Security Scheme, fishermen biometric IDs, vessel registration, "Sea Vigil" exercises, SOPs & JOCs.
Conclusion: Residual gaps (jurisdictional overlaps, manpower) call for a unified command and full MDA under the NMSC; link to SAGAR/MAHASAGAR.

UPSC GS3 2017 15 marks · 250 words

Q. "India's proximity to two of the world's biggest illicit opium-growing states has enhanced her internal security concerns. Explain the linkages between drug trafficking and other illicit activities such as gunrunning, money laundering and human trafficking. What countermeasures should be taken to prevent the same?"

Model Answer Structure

Intro: India lies between the Golden Crescent and Golden Triangle; much of the trafficking flows through maritime and coastal routes.
Drug–crime nexus: Narco-money funds gunrunning and terror; shared smuggling channels carry arms, drugs and trafficked persons.
Maritime dimension: The Indian Ocean drug corridor — large narcotics hauls intercepted at sea by the ICG/Navy/NCB highlight the coastal vector.
Linkages: Money laundering (hawala, crypto) cleans proceeds; human trafficking exploits the same routes and networks.
Countermeasures: Strengthen coastal/maritime surveillance (NC3I, IMAC), NCB-Navy-ICG coordination, PMLA/UAPA enforcement, regional cooperation (IORA, BIMSTEC), and demand-reduction.
Conclusion: An integrated land-sea-financial response is essential to break the converged criminal economy.

UPSC GS3 2016 12.5 marks · 200 words

Q. "Border management is a complex task due to difficult terrain and hostile relations with some countries. Elucidate the challenges and strategies for effective border management."

Model Answer Structure (maritime/coastal angle)

Intro: "Borders" include the maritime frontier — 7,516 km coastline and island territories, not just land borders.
Coastal challenges: Vast, open sea border; porous fishing harbours; creek areas (Sir Creek, Sundarbans); 26/11-type seaborne infiltration.
Difficult terrain at sea: Weather, low-water creeks, island archipelagos demanding all-weather, round-the-clock surveillance.
Hostile-relations dimension: Smuggling, gunrunning and Chinese naval presence add a strategic layer to coastal management.
Strategies: Three-tier security system, coastal radar chain & NC3I, fishermen IDs, ICG capacity, inter-agency JOCs and "Sea Vigil" exercises.
Conclusion: Effective coastal border management needs a unified command, technology-driven MDA and community participation by fishermen.

⚡ Quick Revision

Three tiers: Navy (overall/seaward) → Coast Guard (TW & EEZ) → Marine Police (≤12 nm)
Trigger: 26/11 (2008) → post-attack overhaul
Fusion stack: Radars → NC3I → IMAC → NMDA → NMSC
Vision: SAGAR (2015) → MAHASAGAR (2025)
Threats: sea-terror, piracy, smuggling, IUU, China/String of Pearls

📌 Must-Know Facts

Coastline: 7,516 km
Coastal States/UTs: 13
Islands: 1,382
EEZ: ~2.4 million sq km
Trade by sea: ~95% by volume
Zones: Territorial Waters 12 nm · Contiguous 24 nm · EEZ 200 nm
NMSC created: 2022 · IMAC: Gurugram (2014)

🏛️ Key Agencies

Indian Navy — lead, overall maritime security
ICG — territorial waters & EEZ (Act 1978)
State Marine Police — inshore ≤12 nm
IMAC / NC3I — data fusion & command
NMSC — apex coordinator (under NSCS)
Sagar Prahari Bal — base/asset protection

✍️ Answer Keywords

Three-tier / layered defence
Maritime Domain Awareness (MDA)
Net security provider · first responder
String of Pearls · IOR
SAGAR → MAHASAGAR
Pre-26/11 gaps → post-26/11 reforms