Transit Passage Rights vs. Port State Clearance: What Shipowners Should Know

Published: 1 July 2025 · Last updated: 31 October 2026

Operators new to the Strait of Hormuz sometimes conflate the international law right of transit passage with the commercial and operational requirements for obtaining a Transit Clearance Certificate. The two are distinct. Understanding the difference helps operators plan voyages correctly and avoid costly misunderstandings.

UNCLOS and the right of transit passage

The United Nations Convention on the Law of the Sea (UNCLOS), specifically Articles 37 to 44, establishes the legal regime for straits used for international navigation. The Strait of Hormuz is one such strait. Under UNCLOS, vessels of all states enjoy a right of transit passage through international straits, which cannot be suspended by the coastal states bordering the strait (in this case, Iran and Oman).

Transit passage under UNCLOS means continuous and expeditious passage — vessels must proceed without delay, must not threaten or use force against the coastal states, must refrain from activities beyond those incidental to their normal mode of continuous transit, and must comply with internationally accepted safety regulations and anti-pollution rules.

What transit passage does not cover

The UNCLOS right of transit passage is a right of navigation. It does not exempt vessels from:

• Commercial port state clearance requirements at destination ports
• Compliance with SOLAS, MARPOL, and other international maritime conventions
• Flag-state obligations
• Applicable cargo and customs documentation requirements
• Transit clearance certification requirements established by corridor management bodies

In practical terms, a vessel has the right under international law to navigate the Strait, but it must still comply with the operational framework that governs commercial corridor use. The Transit Clearance Certificate is part of that framework.

Port state clearance

Port state clearance (also called port entry clearance or port health/customs clearance) is the authorisation granted by the port authority and relevant national agencies of the port at which a vessel intends to call. It is a distinct requirement from transit clearance.

A vessel entering the Persian Gulf through the Strait of Hormuz bound for, say, Jebel Ali in the UAE will need port state clearance from UAE port authorities (handled through agents in most cases) in addition to its Transit Clearance Certificate. The transit certificate covers the passage of the Strait; the port clearance covers the vessel's entry into the port facility.

What a Transit Clearance Certificate covers

The Transit Clearance Certificate issued by the HTCA:

• Confirms registration of the named vessel's transit in the HTCA registry
• Records the declared voyage direction, transit date, ports, and cargo
• Confirms that the applicable transit clearance fee has been received
• Is valid for 72 hours from the stated transit date
• Authorises a single transit in the declared direction

The certificate does not constitute a right of navigation (that right exists independently under UNCLOS), nor does it substitute for port state clearance, flag state certificates, cargo documentation, or any other operational requirement.

Vessels subject to transit clearance requirements

All commercial vessels intending to transit the Strait of Hormuz corridor are subject to the transit clearance requirement, regardless of flag state or cargo type. This includes:

• Crude oil and product tankers, LNG/LPG carriers
• Dry bulk carriers, container ships, and general cargo vessels
• Vehicle carriers and RoRo vessels
• Chemical tankers
• Vessels in ballast

Vessels carrying dangerous goods — additional requirements

Vessels carrying cargo classified under the IMDG Code as dangerous goods are subject to additional declaration requirements at the time of application. The HTCA may request supporting cargo documentation before issuing the certificate. Undeclared dangerous goods are grounds for immediate revocation of the certificate and may be referred to coastal-state authorities.

How transit clearance differs from port entry clearance

The key distinctions are:

• Scope: Transit clearance covers passage through the Strait corridor. Port entry clearance covers arrival at a specific port facility.
• Issuing authority: Transit clearance is issued by the HTCA. Port entry clearance is issued by the port authority and relevant national agencies (customs, health, immigration) of the destination port.
• Timing: Transit clearance must be obtained before the Strait transit. Port entry clearance is typically requested in advance of port arrival through local agents.
• Content: Transit clearance records the voyage declaration and fee settlement. Port entry clearance may involve customs declarations, cargo manifests, crew lists, health declarations, and more.

Practical implications for voyage planning

Voyage planners should treat transit clearance and port entry clearance as parallel, independent requirements. A vessel that obtains a Transit Clearance Certificate but does not have port clearance at its destination cannot enter the port. Equally, a vessel with port clearance but without a Transit Clearance Certificate is not in compliance with the HTCA corridor framework for the passage of the Strait.

Applications should be submitted at least 24 hours before the intended transit date. Port clearance requirements vary by country and port; consult local agents well in advance.