Indian Navy Complete Guide – Aircraft Carriers, Submarines, Destroyers & Naval Power | UPSC Notes

 

Indian Navy & Naval Defence System – UPSC Prelims Notes

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1. Importance of Indian Navy in National Security

India is a maritime nation because:

• India has 7,500 km coastline.

• Important Island Territories → Andaman & Nicobar, Lakshadweep.

• 90% of India’s trade by volume passes through sea routes.

• India imports most of its oil & gas via sea.

Therefore Indian Navy ensures:

1. Sea Control → Control own sea routes.

2. Sea Denial → Prevent enemy ships from entering.

3. Power Projection → Show military strength globally.

4. Protection of Trade Routes → Especially Indian Ocean Region (IOR).

5. Humanitarian Assistance & Disaster Relief (HADR).

UPSC Keywords:
Sea Lines of Communication (SLOCs)
Blue Water Navy
Maritime Security

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2. Historical Evolution of Indian Navy

(A) Post-Independence Phase (1947-1960)

• India inherited ships from British Royal Navy.

• Navy was small and technologically weak.

• Heavy dependence on United Kingdom for ships & weapons.

(B) Cold War Phase (1960-1990)

• India moved towards USSR for defence cooperation.

• Purchased submarines, destroyers, missiles from USSR.

• Kilo-class submarines came during this period.

(C) 1965 & 1971 Wars

• Navy realised importance of Sea Control.

• INS Vikrant played decisive role in 1971 war by blocking Pakistan’s eastern ports.

• This war showed importance of aircraft carriers.

(D) Modern Phase (1990-Present)

• Focus shifted to Indigenisation.

• Shipbuilding started in India.

• Major goal → Aatmanirbhar Bharat in Defence.

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3. Types of Naval Warships

(A) Aircraft Carrier

Aircraft Carrier = Floating Airbase.

Functions:

• Carry fighter jets & helicopters.

• Provide air cover to fleet.

• Power projection in ocean.

• Long-range strike capability.

Important Facts:

• Largest warship type.

• Displacement 40,000–100,000 tons.

• Few countries have aircraft carriers.

India’s Aircraft Carriers:

• INS Vikramaditya (Russian origin modified)

• INS Vikrant (First Indigenous Carrier, built at Cochin Shipyard)

Important Terms:

• STOBAR → Short Take-Off But Arrested Recovery.

• Ski Jump → Curved ramp helps aircraft take-off.

• Arrestor Wire → Stops aircraft after landing.

UPSC Trick: Aircraft Carrier = King of Navy.

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(B) Destroyers

Destroyer = Bodyguard of Aircraft Carrier.

Functions:

• Anti-air warfare.

• Anti-submarine warfare.

• Anti-ship warfare.

• Missile defence.

Example:

• INS Visakhapatnam (Project 15B).

Important Feature:

• Can launch BrahMos cruise missile.

• Multi-function radar.

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(C) Frigates

Frigate = Medium size escort ship.

Functions:

• Escort aircraft carriers & merchant ships.

• Anti-submarine patrol.

• Surveillance missions.

Examples:

• INS Shivalik

• INS Nilgiri (Project 17A)

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(D) Corvettes

Corvette = Small, fast warship.

Functions:

• Coastal defence.

• Patrol duties.

• Anti-submarine warfare near coast.

Example:

• INS Kamorta.

UPSC Order of Size:
Aircraft Carrier > Destroyer > Frigate > Corvette.

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4. Submarines of India

(A) Nuclear Submarines

Examples:

• INS Arihant

• INS Arighat

Features:

• Can stay underwater for months.

• Carry nuclear missiles.

• Provide Second Strike Capability.

Important Term:

Nuclear Triad = Land + Air + Sea nuclear launch.

India achieved nuclear triad after INS Arihant.

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(B) Diesel-Electric Submarines

Examples:

• Kalvari class submarine (Scorpene, Project 75)

• Kilo class submarine (Russian origin)

• Shishumar class submarine (German origin)

Problem:

• Need oxygen → Must surface → Less stealth.

Solution:

AIP Technology → Air Independent Propulsion.

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5. Important Naval Projects

• Project 15A / 15B → Destroyers.

• Project 17 / 17A → Frigates.

• Project 75 → Scorpene submarines.

• Project 75I → Advanced AIP submarines.

Important Shipyards:

• Mazagon Dock Shipbuilders Ltd.

• Cochin Shipyard.

• Garden Reach Shipbuilders.

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6. Strategic Importance of Malacca Strait

• Located between Sumatra & Malay Peninsula.

• One of world’s busiest sea routes.

• Important for China’s oil imports.

• Important choke point for India’s sea denial.

UPSC Keyword:
Choke Point.

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7. India vs China Navy – Important Comparison Facts

• India aircraft carriers → 2.

• China aircraft carriers → 3+.

• China submarines → 50+.

• India submarines → ~15 conventional + nuclear.

• China has faster shipbuilding.

UPSC Concept:
Quantity vs Quality.

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8. Current Requirements of Indian Navy

• Third aircraft carrier.

• More nuclear submarines.

• More anti-submarine helicopters.

• Faster shipbuilding.

• Indigenous missile & radar systems.

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Important Terms for Prelims

STOBAR
AIP
Sea Denial
Sea Control
Blue Water Navy
Second Strike Capability
Choke Point

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 Possible UPSC Questions

1. STOBAR configuration is related to aircraft carriers.

2. Project 75 relates to Scorpene submarines.

3. INS Arihant provides second strike capability.

4. Difference between Destroyer & Frigate.

5. AIP technology increases submarine endurance.