April 27, 2026: Iran War Maritime Intelligence Daily

At a Glance

• Hormuz transit drops to 8 crossings, evenly split inbound and outbound, all with AIS active.
• Gulf vessel presence rises to 920, signaling continued system rebuild.
• Dark activity declines slightly to 117 events despite increased traffic.
• Chabahar cluster remains stable with 6 VLCCs and 1 Suezmax operating without AIS.
• ATEELA 1 provides active bunkering support, enabling sustained loitering.
• Vessel behavior reflects controlled but inconsistent movement under enforcement pressure.

Operational Overview 

Maritime activity across the Strait of Hormuz and surrounding corridors remains active but uneven, with transit volumes fluctuating under continued enforcement pressure and operational uncertainty.

Following the April 25 rebound, transit activity slowed again on April 26, despite maintaining full AIS visibility across all crossings. At the same time, Gulf-wide vessel presence continued to increase, pointing to a gradual rebuild in overall system activity.

East of Hormuz, the Chabahar tanker cluster remains stable, with dark VLCC and Suezmax vessels continuing to loiter under supported conditions, reinforcing the role of eastern positioning as part of ongoing adaptation to enforcement constraints.

Across the system, vessel behavior reflects a controlled but inconsistent operating environment, where movement is possible, but still shaped by enforcement dynamics, routing decisions, and strategic waiting patterns.

Hormuz Transit Slows After Rebound

Transit activity through the Strait of Hormuz declined on April 26 following the previous day’s rebound.

A total of 8 vessels crossed the Strait, evenly split between 4 inbound and 4 outbound transits. All crossings were conducted with AIS active, maintaining zero dark transits for a second consecutive day.

Inbound traffic included one Panama-flagged products tanker and three cargo vessels, with one flagged to Comoros and two to India. Routing split between corridors, with the tanker transiting via the Northern Corridor and smaller cargo vessels moving through the Southern Corridor.

Outbound traffic was fully routed through the Northern Corridor and included two bulk carriers flagged to Barbados and St. Kitts and Nevis, along with two cargo vessels flagged to Panama and Comoros.

Compared to April 25, this represents a clear reduction in transit volume, indicating that while movement has resumed, it remains sensitive to shifting operational conditions rather than stabilizing into a consistent flow.

Gulf Activity Continues to Build

Overall vessel presence across the Gulf increased further on April 26, reaching 920 vessels, an increase of 28 compared to the previous day.

Panama remained the leading flag state with 146 vessels, followed by Iran (100), Comoros (89), Marshall Islands (76), Liberia (71), and the UAE (71).

Fleet composition included 156 bulk carriers, 146 product tankers, 83 crude tankers, 62 container ships, 43 LNG and LPG carriers, and 38 chemical tankers.

At the same time, dark activity declined slightly to 117 events, marking a modest 5% reduction despite the increase in overall vessel count.

This divergence between rising traffic and easing dark behavior suggests a short-term shift toward more visible operations, even as underlying deceptive practices remain embedded across the system.

Chabahar Cluster Holds Under Supported Loitering 

The tanker cluster east of Hormuz near Chabahar remains stable, reinforcing the persistence of eastern positioning under enforcement pressure.

Windward Multi-Source Intelligence confirms the continued presence of seven tankers in the anchorage area, consisting of six VLCCs and one Suezmax, all operating without AIS transmission.

The vessels remain in fixed positions, with no indication of loading or ship-to-ship transfer activity, supporting the assessment of sustained loitering rather than active operations.

A key supporting element is the presence of ATEELA 1 (IMO 9548990), an Iran-flagged, sanctioned oil products tanker currently transmitting AIS in the area. The vessel is assessed to be functioning as a dedicated bunkering unit.

ATEELA 1’s role enables refueling and logistical support for the dark cluster, allowing large tankers to remain on station for extended periods while awaiting clearance, routing changes, or future loading opportunities.

The combination of persistent dark positioning and active support infrastructure indicates deliberate staging behavior, rather than incidental congestion or short-term delay.

Outlook

Transit through the Strait remains active but inconsistent, with volumes fluctuating even as full AIS visibility continues across crossings. The increase in Gulf-wide vessel presence points to a gradual rebuild in activity, but not a return to stable or predictable movement patterns.

At the same time, the slight reduction in dark activity suggests a temporary shift toward more visible operations, though underlying deceptive practices remain a constant feature of the system.

East of Hormuz, the Chabahar cluster continues to hold in place, supported by active bunkering and sustained loitering. This reinforces the role of eastern positioning as part of an adaptive response to enforcement pressure, enabling vessels to wait, reposition, or prepare for future movement.

The operating environment remains defined by partial normalization under sustained enforcement, where movement, visibility, and risk continue to evolve together rather than stabilize.