- Only 10 vessels transited the Strait of Hormuz between 7-11 March, down from a normal daily average of 70-80.
- At least 16 ships have been attacked since the conflict began, with GPS/AIS interference affecting over 1,650 vessels.
- Diversions via the Cape of Good Hope remained high, with 383 crossings recorded in the same week.
Global maritime trade is confronting a severe systemic disruption as commercial traffic through the Strait of Hormuz collapsed by 90% in a single week. Between 7 and 11 March, only 10 ships crossed this vital chokepoint, which typically handles 30% of seaborne oil shipments. Coordinated attacks, widespread electronic interference, and the threat of naval mines have rendered the area high-risk, forcing major route reconfigurations and straining energy and bulk supply chains.
CONTEXT AND BACKGROUND
The Strait of Hormuz is a strategic maritime passage connecting the Persian Gulf with the Gulf of Oman. Historically, it sees 70-80 vessel transits daily, primarily crude oil tankers and container ships. Even temporary closures impact oil prices and shipping freight rates immediately.
In past conflicts, such as the Tanker War in the 1980s, similar disruptions occurred. However, the current scale of electronic interference and attack precision is unprecedented. Modern maritime intelligence platforms, like Windward Maritime AI, now enable real-time monitoring of these disturbances.
IN-DEPTH TECHNICAL ANALYSIS
Traffic Collapse and Shadow Operations
The 90% decline in crossings does not mean the Strait is empty. Satellite imagery has detected dark vessels (ships navigating with AIS turned off), including a possible VLCC (Very Large Crude Carrier, over 300 metres in length) near Iranian waters. This suggests some traffic, likely linked to high-risk or shadow fleets, continues under low-visibility conditions.
An unusual phenomenon has emerged: numerous vessels, especially those under Chinese flag, broadcast AIS messages like ‘CHINESE CREW OWNER’. This defensive tactic aims to deter attacks by identifying crew nationality, but its effectiveness is limited, reflecting a breakdown in standard commercial navigation norms.
Electronic Interference and Mine Threats
Interference with the AIS (Automatic Identification System) and GPS has impacted more than 1,650 ships. Patterns have evolved from clusters of false signals to zigzag displacements projecting vessels hundreds of kilometres from their actual positions. This compromises navigation, safety, regulatory compliance, and insurance calculations.
US intelligence warns of potential naval mine deployment by Iran. Even limited placement could close the Strait for weeks, as mine-clearing operations require specialised vessels and are extremely slow. This unconfirmed threat is already affecting insurance premiums and routing decisions.
CONCRETE OPERATIONAL IMPLICATIONS
Shipping companies have activated large-scale contingency plans. The alternative route via the Cape of Good Hope in southern Africa has seen sustained traffic, averaging 77 daily crossings. This adds 10-15 days to Asia-Europe voyages, increasing fuel consumption, operational costs, and demanding urgent fleet capacity reallocation.
In the Gulf, Saudi Arabia is accelerating its bypass using the Petroline pipeline to the port of Yanbu on the Red Sea, where 27 VLCCs await loading. This logistical restructuring reduces dependence on the Strait of Hormuz for Saudi exports but is not quickly replicable by other regional producers.
IMPACT ON THE LABOUR MARKET
This crisis is driving immediate demand for professionals specialised in maritime security, crisis management, and high-tension operations. Bridge officers with experience in GPS-denied or interfered navigation, along with naval cybersecurity experts, will see increased market value.
Crew on vessels still operating in the zone face extreme personal risks, potentially leading to hazard pay claims or shortages of personnel willing to embark on Gulf routes. Companies must strengthen security protocols and training for asymmetric threats.
MACRO CONTEXT
The conflict extends beyond the region. China has deployed a signals intelligence vessel, the Liaowang-1, in the Gulf of Oman, while Pakistan launched a naval escort operation to protect merchant ships to Karachi. This militarisation complicates compliance with international regulations like the ISPS Code (International Ship and Port Facility Security Code).
Sanctions are being applied asymmetrically. For example, while OFAC (the US Office of Foreign Assets Control) temporarily allowed delivery of Russian crude already at sea, Swedish authorities boarded the sanctioned tanker SEA OWL I. This creates a fragmented and volatile regulatory landscape for operators.
OUTLOOK
Traditional commercial traffic is unlikely to recover in the Strait of Hormuz until minimum security is restored and the mine threat clarified. Short-term, diversions via the Cape of Good Hope will consolidate, with increased use of alternative land pipelines like Saudi Arabia’s.
Freight rates for tankers and bulk carriers will remain elevated due to longer routes and vessel scarcity in the Gulf. Investors should closely monitor war risk insurance premiums, which act as a thermometer for perceived risk. Investment decisions must be based on thorough analysis amid high geopolitical uncertainty.
FAQ
What is AIS and why is its spoofing so dangerous? The AIS (Automatic Identification System) broadcasts a vessel’s position, identity, and course. Spoofing can make a ship appear in a false location, causing collisions, hindering rescues, and violating safety regulations. In this crisis, it is used as a weapon to create maritime traffic chaos.
How does the threat of naval mines affect commercial operations? Mere suspicion of mines can close a strait. Insurers may declare the area uninsurable, prompting ship rerouting. Mine clearance is slow and hazardous, requiring specialised minesweeper vessels, potentially paralysing traffic for weeks or months.
What are VLCCs and why are they key to Saudi strategy at Yanbu? VLCCs (Very Large Crude Carriers) are the largest crude oil tankers, capable of carrying over 2 million barrels. Saudi Arabia is concentrating them at Yanbu to load oil transported via its land pipeline from eastern fields, avoiding the risky Strait of Hormuz for exports.
Editorial Note: This article has been professionally adapted from Spanish to British English
for the WishToSail.com international maritime audience. Original article published at
QuieroNavegar.app.
