Illegal Anchoring and STS Operations in Malaysian Waters: Legal Risks, Sanctions, and Commercial Exposure
01 July 2026
| 1. |
Introduction: The Shifting Regulatory Landscape |
The maritime corridor encompassing Malaysian waters stands as one of the busiest shipping lanes globally. Consequently, the regulatory oversight maintained by Malaysian authorities has intensified significantly.
"Illegal anchoring", which refers to the act of a vessel dropping anchor or drifting within a territorial sea, port limits, or internal waters without first securing the requisite regulatory approvals from local authorities, is no longer viewed by local regulators as a minor, technical administrative oversight. Instead, it is treated as a serious statutory breach that triggers strict enforcement action.
This issue is, however, not confined to the physical act of dropping anchor to rest. It frequently arises in common commercial transactions, such as when a vessel anchors or drifts for operational reasons, including waiting for berth allocation, bunkering, or conducting ship-to-ship (“STS”) transfers without a valid permit.
| 2. |
The Legislative Framework: Section 491B of the Merchant Shipping Ordinance 1952 |
The primary legislation governing vessel operations and anchoring within Malaysian waters is the Merchant Shipping Ordinance 1952 (“MSO 1952”).
| (a) |
The Statutory Catch-All: Section 491B(1)(l) |
According to recent enforcement reports by the Malaysian Maritime Enforcement Agency (“MMEA”), illegal anchoring detentions are most frequently rooted to Section 491B(1)(l) of the MSO 1952.
While Section 491B(1)(l) does not explicitly use the words "anchoring without a permit," the Malaysian Shipping Notice (MSN) No. 05/2014 explicitly clarifies that the statutory phrase "any other activity" encompasses both anchoring and drifting in non-designated areas. Section 491B creates the offence, while the Shipping Notice explains how the Marine Department administers it.
Further Marine Department directives stipulate that any vessel intending to anchor in non-anchorage areas, or engage in specified marine activities, must secure prior authorisation from the Marine Department Malaysia and, where applicable, the relevant port authority.
| (b) |
Criminal and Statutory Penalties |
Where there is a contravention under Section 491B, the MMEA is empowered to detain the vessel, initiate formal investigations and pursue criminal prosecution. In practice, a detention can result in significant operational disruption, including delays to cargo operations, interruption of charterparty performance and increased commercial costs pending the conclusion of the authorities' investigations. Upon conviction, statutory liability can be imposed collectively or individually upon the owner, master, or local agent of the vessel:
Monetary Fine : up to RM100,000
Imprisonment : term no exceeding two (2) years
Combined sanction : both the fine and imprisonment may be imposed concurrently.1
Beyond the statutory penalties, owners and operators should also be mindful of the wider commercial consequences of detention, including potential off-hire disputes, demurrage claims, cargo delays, insurance notifications and increased regulatory scrutiny.
| 3. |
Operational Obligations While Anchored |
Securing an anchoring permit does not mean a vessel has free rein to do whatever it pleases. While lawfully anchored or operating within Malaysian waters, a vessel remains subject to strict operational and navigational obligations designed to maintain maritime safety and security:
- Continuous AIS Transmission: Under recent Marine Department initiatives, vessels must keep their Automatic Identification System (“AIS”) active and transmitting continuously to facilitate maritime monitoring.2 Masters are permitted to switch off their AIS only under highly specific, authorised circumstances (such as imminent security or piracy risks)3 and must immediately notify the Marine Department Malaysia.
- Navigational & Traffic Compliance: Vessels must strictly adhere to local traffic separation schemes, port instructions, and navigational safety requirements.
- Operational Readiness: The vessel must remain fully seaworthy and capable of manoeuvring immediately if instructed to do so by maritime authorities.4
- Communications & Pollution Control: The crew must maintain continuous communication channels with local maritime authorities and ensure robust pollution prevention measures are active onboard.
| 4. |
Ship-to-Ship (STS) Transfers & Stricter Enforcement |
Ship-to-Ship transfers of cargo or bunker fuel are also subject to Section 491B(1) of the MSO 1952, particularly to limb (k) of the said provision.
5 Operators are required to obtain prior approval and show strict compliance with local safety and environmental frameworks before commencing any transfer.
In March 2026, the MMEA intercepted and detained two oil tankers operating near Pulau Jarak. The vessels were suspected of conducting unauthorised STS bunkering operations involving the transfer of approximately 750 metric tonnes of marine fuel oil, while simultaneously anchoring in an unapproved zone without the authorisation of the Director General of Marine.
This high-profile enforcement action underscores the reality that tracking unauthorised operations remains a top priority for Malaysian maritime law enforcement.
| 5. |
Dual Exposure: Sanctions and Trade Compliance, and Environmental Liability |
For international shipowners and charterers, the fallout from an illegal anchoring or unauthorised STS incident in Malaysia extends far beyond local statutory fines; it directly intersects with severe global compliance and environmental risks.
| (a) |
Global Sanctions and Trade Compliance |
Globally, regulators and sanctions enforcement bodies closely scrutinize offshore anchoring and unauthorised STS transfers. These activities are frequently flagged as deceptive shipping practices used to conceal cargo origins, mask vessel identities or obfuscate illicit ownership structures.
Vessels exhibiting prolonged offshore anchoring, unexplained AIS gaps, or unauthorised STS activities automatically trigger the algorithmic red flags of international trade compliance regulators and maritime intelligence platforms.
Consequently, a local detention by Malaysian authorities can trigger wider sanctions investigations, jeopardizing a company's global trading capabilities.
| (b) |
Environmental Exposure |
Illegal anchoring and unauthorised STS operations pose severe ecological threats, particularly to Malaysia's sensitive marine ecosystems, coral reefs, and protected habitats.
In the event of an oil spill, marine pollution incident or other environmental damage arising from such operations, vessel owners and operators may face liability beyond maritime regulatory offences. Enforcement action may be taken under local legislation, including:
- the Environmental Quality Act 1974;
- the Exclusive Economic Zone Regulations 2026; and
- the Merchant Shipping (Liability and Compensation for Oil and Bunker Oil Pollution) Act 1994.
These frameworks often impose strict statutory liability, exposing the vessel's registered owners and operators to clean-up and remediation costs, fines, mandatory compensation claims and extensive third-party civil liability for environmental damage and localised economic losses.
To mitigate the legal and commercial risks of operating within Malaysian waters, below are some recommended protocols that may be adopted by owners, charterers, managers, and masters:
- Pre-Clearance Verification: Never assume a designated anchorage area is open or that a local agent has secured verbal clearance. Verify that a written permit from the Director General of the Marine Department Malaysia (and relevant port authorities) is in hand prior to entering port limits or dropping anchor.
- Strict AIS Compliance: Ensure that the vessel’s AIS remains operational and continuously transmitting. If an emergency or security risk requires the AIS to be deactivated, ensure the master immediately documents the justification and transmits a formal notification to the Marine Department Malaysia.
- Enhanced Sanctions Due Diligence: Prior to engaging in any STS operation, conduct rigorous due diligence on counterparties, cargo origins and historical vessel trading patterns, especially when operating in areas under heightened regulatory scrutiny.
- Clear Charterparty Clauses: Ensure charterparty agreements clearly allocate risk, liability, and time-counting consequences relating to delays caused by local regulatory compliance checks, anchoring permits and MMEA inspections.
1 Section 491B(4) of the MSO 1952.
2 Malaysia Shipping Notice (MSN) 05/2019.
3 Maritime Organization (IMO) Resolution A.1106(29).
4 Section 72 of the MSO 1952.
5 Section 491B(1)(k) of the MSO 1952 expressly requires the Director General of Marine to be notified if a vessel is engaged or intends to engage in any ship-to-ship activity in Malaysian waters.
This article/alert contains general information only. It does not constitute legal advice nor an expression of legal opinion and should not be relied upon as such. For further information, kindly contact skrine@skrine.com.