Reference
Maritime Security Glossary & FAQ
Key terms, organizations, and concepts for understanding maritime security in the Gulf region. Essential reading for shipping professionals, analysts, and researchers.
Frequently Asked Questions
What is the current risk level in the Strait of Hormuz?
The Strait of Hormuz is currently rated HIGH risk by GulfStraitsAI due to ongoing IRGCN harassment of commercial vessels, Iranian nuclear tensions, and the possibility of retaliatory vessel seizures. The IRGCN has seized multiple tankers since 2019 and continues to operate fast-attack craft in the strait. US-Iran nuclear negotiations add further uncertainty. Live risk scores are updated every 15 minutes on our dashboard.
Why are ships avoiding the Red Sea?
Most major shipping companies (Maersk, MSC, CMA CGM, Hapag-Lloyd, Evergreen) have suspended Red Sea operations since late 2023 due to Houthi missile and drone attacks on commercial vessels. Over 50 vessels have been attacked since October 2023; two have been sunk (Rubymar, MV Tutor) and crew members have been killed. War-risk insurance premiums have risen 50–100× to 0.5–1.0% of hull value per transit, making the route economically unviable for most operators. Ships are rerouting via the Cape of Good Hope instead.
What percentage of world oil passes through the Strait of Hormuz?
Approximately 20–21% of the world's total petroleum liquids — about 17–18 million barrels per day — transit the Strait of Hormuz. This includes crude oil from Saudi Arabia, Iraq, Kuwait, UAE, Qatar, and Iran, as well as approximately 20% of global LNG supply (primarily from Qatar). There is no pipeline alternative capable of replacing this volume, making Hormuz the world's most critical energy chokepoint.
What is the IRGCN and why does it threaten shipping?
The IRGCN (Islamic Revolutionary Guard Corps Navy) is Iran's elite naval force, separate from the conventional Iranian Navy. It reports directly to Supreme Leader Khamenei and conducts asymmetric naval operations in the Persian Gulf, Strait of Hormuz, and Gulf of Oman. The IRGCN seizes commercial vessels as tools of economic coercion and diplomatic leverage — particularly targeting vessels with links to Israel, the UK, the US, or countries enforcing sanctions against Iran. Notable seizures include the Stena Impero (2019), Advantage Sweet (2023), and MSC Aries (2024).
How is maritime war risk insurance priced?
War risk insurance is priced as a percentage of the vessel's hull value per transit. In safe waters, premiums are negligible (0.01–0.05%). In high-risk zones like the Red Sea (2024), premiums rose to 0.5–1.0% of hull value per transit. For a Very Large Crude Carrier (VLCC) valued at $100 million, this means $500,000–$1,000,000 per Red Sea transit in war risk insurance alone. Premiums are set by the London market (Lloyd's of London) and international marine insurers based on the Joint War Committee's Listed Areas designation.
What is the Bab-el-Mandeb Strait?
The Bab-el-Mandeb ('Gate of Tears') is a strait between Yemen and the Horn of Africa (Djibouti and Eritrea) connecting the Red Sea to the Gulf of Aden and the Indian Ocean. It is the southern gateway to the Suez Canal route. Before the Houthi attack campaign began in October 2023, approximately 6–7 million barrels of oil and 15% of global seaborne trade transited the strait daily. Since then, most major carriers have avoided it, rerouting around the Cape of Good Hope.
How does GulfStraitsAI calculate risk scores?
GulfStraitsAI calculates risk scores for five Gulf chokepoint regions (Strait of Hormuz, Bab-el-Mandeb, Persian Gulf, Red Sea, Gulf of Oman) using an AI pipeline powered by Google Gemini. The system continuously monitors news from maritime security sources (USNI News, gCaptain, Hellenic Shipping News, NGA ASAM), applies natural language processing to classify incidents by type and severity, and aggregates scores based on event frequency, severity, and recency. Scores are updated every 15 minutes and range from 0 (no threat) to 10 (critical). Scores of 7+ indicate HIGH risk.
What is the impact of the Red Sea crisis on freight rates?
The Red Sea crisis has significantly increased global container freight rates. The Freightos Baltic Index (FBX) from Asia to Europe rose from approximately $1,500/FEU in late 2023 to over $8,000/FEU by mid-2024 — a more than 5× increase. Cape of Good Hope rerouting adds approximately 3,500–4,000 nautical miles per round trip between Asia and Europe, consuming additional fuel and time and reducing effective fleet capacity by requiring more vessels to cover the same trade volumes. Suez Canal revenues fell approximately 60% year-on-year in 2024.
Organizations
IRGCN (Islamic Revolutionary Guard Corps Navy)
OrganizationsThe naval branch of Iran's Islamic Revolutionary Guard Corps (IRGC). The IRGCN is distinct from Iran's conventional navy (IRIN) and reports directly to Supreme Leader Khamenei rather than the president. It is responsible for defending Iran's territorial waters, conducting asymmetric naval warfare, and enforcing Iranian influence in the Persian Gulf and Strait of Hormuz.
Context
The IRGCN is the primary actor in Iranian maritime aggression. It operates a large fleet of fast-attack craft (FACs), midget submarines, and armed speedboats designed for asymmetric 'swarm' tactics against larger naval vessels. The IRGCN has conducted or facilitated limpet mine attacks on tankers, vessel seizures via armed boarding parties, and harassment operations against US Navy vessels. Unlike a conventional navy, the IRGCN can operate with high ambiguity and deniability.
Houthi (Ansar Allah)
OrganizationsA Yemeni political and armed movement officially called Ansar Allah ('Supporters of God'). The Houthis control significant territory in Yemen, including the capital Sanaa and the Red Sea port of Hodeidah. They are backed by Iran, which supplies weapons, intelligence, and training.
Context
The Houthis began attacking commercial shipping in October 2023, citing solidarity with Gaza during the Israel-Hamas war. They have targeted vessels with alleged Israeli, British, or US connections — but in practice have struck vessels of many nationalities. The Houthis have deployed anti-ship missiles (including Iranian-supplied variants), one-way attack drones, ballistic missiles, and naval mines. Their attacks are the primary cause of the Red Sea shipping crisis.
Insurance & Finance
War Risk Insurance
Insurance & FinanceA specialized marine insurance policy covering damage to vessels or cargo caused by acts of war, including missile attacks, mines, boarding and seizure, and terrorism. War risk insurance is separate from standard hull and machinery (H&M) insurance and protection & indemnity (P&I) insurance.
Context
War risk premiums are quoted as a percentage of hull value and can change rapidly in response to geopolitical developments. Before the Houthi attack campaign, premiums for Red Sea transits were negligible (0.01–0.05% of hull value). By early 2024, premiums had risen to 0.5–1.0% of hull value per transit — a 50–100× increase. For a VLCC valued at $100 million, this means $500,000–$1,000,000 per transit in insurance alone. The Joint War Committee (JWC) of Lloyd's of London designates Listed Areas where war risk applies.
P&I Club (Protection and Indemnity Club)
Insurance & FinanceA mutual insurance association that provides marine liability insurance to shipowners and operators, covering third-party liabilities including crew injury/death, cargo damage, pollution, and wreck removal. P&I Clubs are non-profit mutual organizations owned by their members.
Context
The major P&I Clubs (UK P&I, Gard, Skuld, North P&I, etc.) are members of the International Group of P&I Clubs, which handles claims above a certain threshold through a pooling arrangement. In the context of the Red Sea crisis, P&I clubs have had to assess coverage for vessel seizures, crew injury/death from missile attacks, and environmental liability from struck tankers carrying crude oil. P&I war risk exclusions mean that some liabilities from Houthi attacks may require separate war risk insurance coverage.
Naval Operations
Operation Prosperity Guardian
Naval OperationsA US-led multinational naval operation announced in December 2023 to protect commercial shipping in the Red Sea and Bab-el-Mandeb Strait from Houthi attacks. The operation is run by Combined Task Force 153 and involves warships from the US, UK, France, Canada, the Netherlands, and other nations.
Context
Operation Prosperity Guardian was established in direct response to the Houthi attack campaign. The operation provides naval escorts and conducts interception of incoming missiles and drones. However, the scale of Houthi attacks and the geographic spread of the threat have made it impossible to provide direct escorts for all commercial traffic. The operation has been supplemented by Operation Poseidon Archer (US-UK strikes on Houthi positions in Yemen), but attacks have continued.
Combined Maritime Forces (CMF)
Naval OperationsA multinational naval partnership headquartered in Bahrain that conducts maritime security operations in the Red Sea, Gulf of Aden, Gulf of Oman, Arabian Sea, and Indian Ocean. CMF comprises over 40 member nations and operates three Combined Task Forces: CTF-150 (maritime security), CTF-151 (counter-piracy), and CTF-153 (Red Sea security).
Context
CMF was established in 2002 following the September 11 attacks. CTF-153, focused on Red Sea security, was established in 2022. The organization coordinates naval patrols, information sharing, and escorts for commercial vessels. CMF's effectiveness in the Red Sea crisis has been limited by the scale and sophistication of Houthi attacks, and most commercial operators have elected to reroute rather than rely on naval escorts.
Risk Score (Maritime)
Naval OperationsA quantitative assessment of the probability and severity of maritime security threats in a given region, expressed as a numerical value (commonly 0–10). Risk scores aggregate factors including recent incident frequency, severity, geopolitical tension, and intelligence assessments.
Context
GulfStraitsAI calculates risk scores for five Gulf chokepoint regions using AI analysis of news and official reports. Scores of 7+ indicate HIGH risk (critical threat to commercial shipping), 4–7 indicate WATCH (elevated risk, monitoring recommended), and below 4 indicate CLEAR (background risk only). Risk scores inform war risk insurance pricing, vessel routing decisions, and security assessments for commercial operators. They are not a guarantee of safety.
AIS (Automatic Identification System)
Naval OperationsA maritime tracking system that uses VHF radio transmissions to broadcast a vessel's position, speed, course, and identity. AIS was made mandatory for vessels over 300 gross tonnes by the International Maritime Organization (IMO) in 2002. Data is available from coastal receivers and satellite systems.
Context
AIS is the primary tool for tracking commercial vessel movements in real time. In crisis zones, vessels sometimes disable their AIS transponders ('go dark') to reduce their targeting profile — particularly when transiting high-risk areas. AIS data is used by maritime intelligence agencies, insurers, and risk analysts to track rerouting behavior. The dramatic shift in AIS tracks from Red Sea to Cape of Good Hope routing after October 2023 provided some of the clearest evidence of the shipping crisis's impact.
Geography
Maritime Chokepoint
GeographyA narrow waterway through which a disproportionate amount of global seaborne trade passes, such that disruption causes significant economic consequences worldwide. The term derives from the military concept of a geographic bottleneck that can be 'choked off' to block movement.
Context
The world's most critical maritime chokepoints include the Strait of Hormuz (~20% of global oil), the Bab-el-Mandeb (~15% of global trade), the Malacca Strait (~25% of global trade), the Suez Canal (~12% of global trade), and the Panama Canal (~5% of global trade). Because vessels cannot easily reroute around these points (or doing so adds weeks to voyages), they are targets of political pressure, piracy, and military action.
Tanker War (1984–1988)
GeographyA phase of the Iran-Iraq War (1980–1988) in which both sides attacked neutral tankers carrying oil from the Persian Gulf, attempting to deny each other oil export revenues. Over 500 attacks on ships from 40+ nations occurred, killing hundreds of sailors and triggering international naval intervention.
Context
The Tanker War is the historical precedent most relevant to current Gulf maritime security. The US intervened with Operation Earnest Will (1987–88), re-flagging Kuwaiti tankers under the US flag and providing naval escorts. The USS Stark was hit by an Iraqi Exocet missile (37 killed) and USS Samuel B. Roberts struck a mine. The experience established the template of Western naval coalitions protecting Gulf shipping — a template repeated with Operation Prosperity Guardian in 2023–24.
Legal & Regulatory
Flag State
Legal & RegulatoryThe country under whose laws a ship is registered and whose flag it flies. Under international maritime law, a vessel is subject to the jurisdiction of its flag state when on the high seas. The flag state is responsible for ensuring the vessel complies with international conventions.
Context
In the context of Gulf maritime security, the flag state of a vessel determines which country is diplomatically responsible for its protection when seized or attacked. The UK is obligated to seek the release of UK-flagged vessels seized by the IRGCN (as with Stena Impero). Vessels often choose flag states with weak oversight ('flags of convenience') — Panama, Liberia, Marshall Islands, and Bahamas are the most popular — primarily for regulatory and tax reasons rather than security. Iran and Houthi forces target vessels based on owner/operator nationality or cargo connections rather than flag state.
Threat Types
Anti-Ship Missile (ASM)
Threat TypesA guided missile designed to be launched from aircraft, ships, submarines, or land and to strike and damage or sink surface vessels. Modern anti-ship missiles use various guidance systems including active radar homing, infrared imaging, GPS, and inertial navigation.
Context
Iran has supplied the Houthis with a range of anti-ship missiles including the Al-Mandeb-1 (based on the Chinese C-802), the Filjal/Noor, and domestically developed variants. These missiles can travel at subsonic or supersonic speeds and carry warheads of 200–500+ kg capable of causing catastrophic damage to commercial vessels. The threat of anti-ship missiles has been the primary driver of commercial shipping abandoning the Red Sea route.
One-Way Attack Drone (Loitering Munition)
Threat TypesAn unmanned aerial vehicle (UAV) designed to fly toward a target and detonate on impact, rather than return to a base. Also called 'kamikaze drones' or 'loitering munitions.' These weapons combine the endurance of a drone with the destructive payload of a guided missile.
Context
Iran has developed several one-way attack drone designs, including the Shahed-136 (exported to Russia and transferred to Houthi-linked forces). These drones are relatively cheap to produce (estimated $20,000–$50,000 each) but can carry warheads of 30–50 kg and cause significant damage to commercial vessels. Their low radar cross-section makes them difficult to detect and intercept. Houthi forces have used them extensively in the Red Sea campaign alongside anti-ship missiles.