April 14, 2026: Iran War Maritime Intelligence Daily

At a Glance

• First full day under U.S. blockade enforcement shows mixed vessel response, including continued transit, rerouting, and delays.
• Sanctioned and falsely flagged vessels continue to operate, testing enforcement limits in real time.
• Vessel turnarounds and re-engagement patterns reflect hesitation followed by selective continuation.
• Blockade evasion behavior persists, including dark port calls and re-emergence of previously inactive vessels.
• ~20 million barrels of Iranian oil are concentrated offshore Malaysia, reinforcing indirect distribution networks.
• 814 vessels remain in the Gulf, with continued dark activity and constrained but ongoing Hormuz transit.
• The operating environment reflects active enforcement alongside ongoing evasion and partial compliance.

Operational Overview 

Maritime activity in the Strait of Hormuz has entered its first full day under active U.S. enforcement, with vessel behavior indicating a fragmented and uneven response to the blockade.

Initial movements show a combination of continued transit, route deviation, and potential evasion. Sanctioned and falsely flagged vessels remain active, with some proceeding through the Strait while others delay, reverse course, or adjust routing patterns.

At the same time, Iranian oil flows continue through indirect distribution networks, with significant volumes accumulating offshore rather than transiting directly through Hormuz.

The operating environment is shifting from uncertainty to active enforcement dynamics, where compliance, evasion, and selective movement are occurring simultaneously.

Early Enforcement Signals and Vessel Response

The first observable effects of the blockade are now visible in vessel behavior, with sanctioned and falsely flagged vessels continuing to operate under evolving enforcement conditions.

Two such vessels were identified transiting the Strait. RICH STARRY, a U.S.-sanctioned handy-size tanker signaling laden status, resumed outbound transit after previously turning around. Its routing did not follow the Larak Island corridor and instead aligned with the alternative outbound path proposed by Iran. At the same time, MURLIKISHAN, a U.S.-sanctioned chemical tanker, was observed inbound.

Under previous enforcement frameworks, including the December blockade of Venezuela, sanctioned and stateless tankers were primary targets for interdiction. The continued movement of similar vessel profiles indicates that operators are testing the practical limits of enforcement in real time.

The behavior of RICH STARRY reflects this dynamic. Its initial turnaround indicates hesitation ahead of enforcement, followed by re-engagement once conditions became clearer. The inbound movement of MURLIKISHAN reinforces that sanctioned-linked traffic has not ceased under the blockade.

Additional vessel behavior across the region highlights early-stage adaptation. Windward identified four vessels exhibiting highly unusual patterns. Two are operating without AIS, while two others executed turnarounds under atypical conditions.

One vessel departed the Gulf of Oman following a turnaround, while another abandoned inbound transit and is currently moving at approximately 1 knot. A third vessel is operating at approximately 3.9 knots. These speeds are not consistent with standard transit through the Strait.

Taken together, the combination of AIS gaps, turnarounds, and slow-speed movement indicates abnormal behavior aligned with heightened enforcement risk. Vessel movements reflect hesitation, staging, and real-time reassessment of routing decisions in response to the blockade.

Fragmented Response to Enforcement

Vessel behavior across the Strait reflects a fragmented response rather than consistent compliance.

Some vessels continue transiting under elevated risk. Others delay, reverse course, or shift routing paths. This mix of behaviors indicates that operators are adjusting in real time based on evolving enforcement signals.

The current pattern combines continued movement with caution, rather than a broad withdrawal from the Strait.

Blockade Evasion and Non-Compliant Activity

Multiple vessels are exhibiting behavior consistent with potential blockade evasion or non-compliance.

A falsely flagged Comoros-flagged vessel that previously crossed the Strait has remained idle in the Gulf of Oman since approximately 23:00 BST and later called at Bushehr without transmitting AIS. This indicates continued reliance on dark activity even after transit.

Another vessel, a Comoros-flagged handysize bulk carrier, reappeared in the Strait after going dark on February 28 at the start of the conflict. Its last traceable port call was Bandar Imam Khomeini in Iran. Historical cargo patterns link the vessel to grain shipments from Russia-occupied Ukrainian ports to Iran and Syria.

Based on current enforcement parameters, vessels with these characteristics would be expected to face interdiction. Their continued presence indicates that enforcement has not yet fully constrained this segment of activity.

Iranian Oil Flows Shift to Offshore Hubs

Iranian oil distribution continues through indirect routing and offshore transfer networks.

As of April 13, at least 11 tankers carrying approximately 20 million barrels of Iranian oil are positioned offshore Malaysia within a ship-to-ship transfer hub. These vessels are likely awaiting counterpart vessels for offloading or preparing for onward movement.

This concentration highlights the continued use of offshore storage and transfer mechanisms, allowing Iranian oil flows to persist outside direct transit through the Strait.

Gulf-Wide Activity and Transit 

Gulf-wide vessel presence remains elevated despite enforcement conditions.

As of April 13, a total of 814 vessels are present in the Gulf, an increase of 7 vessels compared to the previous day. This includes 141 bulk carriers, 89 product tankers, 83 chemical tankers, 69 crude tankers, 56 container ships, 42 LNG/LPG vessels, and 334 other vessel types. Top flag registries include Panama, Comoros, Iran, the Marshall Islands, and Liberia.

On April 13, transit through Hormuz continues at constrained levels:

• Inbound crossings: 10 vessels (9 AIS, 1 dark), including 2 tankers (Aruba, Vietnam), 1 bulk carrier (Marshall Islands), and 7 cargo vessels (Panama, Antigua and Barbuda, Comoros, Togo, India).
• Outbound crossings: 7 vessels (all AIS), including 3 tankers (Panama, Comoros, Hong Kong), 3 cargo vessels (India, Comoros, Gambia), and 1 bulk carrier (Liberia).

A total of 156 dark activity events were recorded across the region.

This confirms that while transit continues, it remains limited, selective, and supported by persistent low-visibility operations.

Outlook

Transit through the Strait remains limited and concentrated among sanctioned, falsely flagged, and high-risk vessels, with early enforcement signals now shaping vessel behavior.

Operators are responding unevenly. Turnarounds, rerouting, and resumed transits indicate hesitation followed by selective continuation, rather than full compliance with the blockade.

Dark activity remains a central enabler of ongoing operations, supporting both post-transit port calls and broader evasion strategies. At the same time, Iranian oil flows are increasingly routed through offshore hubs, reducing reliance on direct Hormuz transit.

The operating environment is now defined by active enforcement, partial compliance, and continued evasion, with vessel movement shaped by both restriction and adaptation.