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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →AIS spoofing can make a ship’s broadcasted identity or position misleading, while repeated ship-to-ship transfers can obscure a cargo’s path and origin. Neither an AIS gap nor a transfer at sea proves sanctions evasion: investigators look for a corroborated pattern across vessel movements, cargo records, ownership, flag, insurance and other evidence.
What AIS can—and cannot—tell you
The Automatic Identification System (AIS) broadcasts information about a vessel’s identity and movement. It is useful for tracking ships, but it is not independent proof that a vessel is who it claims to be or is actually at the position shown. Its information comes from the vessel’s transmissions, received by shore stations or satellites; a misleading transmission can therefore make a vessel appear different from reality.
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Three situations can look similar on a tracking display but have different explanations: a vessel may stop transmitting, a receiver may fail to receive its signal, or someone may deliberately manipulate the transmitted data. A gap alone does not establish which occurred. Confirmed identity or location inconsistencies, corroborated by other records, are more informative than silence by itself.
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Disabling AIS and altering AIS data
The U.S. Treasury Department’s Office of Foreign Assets Control (OFAC) describes vessels disabling transponders or altering AIS data to mask movements, port calls and ship-to-ship activity. Falsification can include reporting another vessel’s Maritime Mobile Service Identity (MMSI), or using an IMO number associated with a scrapped ship. The IMO describes falsified AIS as intentionally changing a ship’s identifying information or making it appear to be another vessel.
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These examples matter because an apparently continuous track is not necessarily trustworthy. A track that conflicts with a vessel’s other identity information, or that places it somewhere inconsistent with other records, merits scrutiny. But a display anomaly does not, on its own, identify who caused it or why.
How ship-to-ship transfers obscure cargo provenance
A ship-to-ship (STS) transfer is the movement of cargo between vessels at sea. It has legitimate uses; the transfer itself is not proof of wrongdoing. The difficulty for a buyer or investigator is that each transfer adds another link to reconstruct: which vessel held the cargo, where and when the handoff occurred, and whether the cargo records continued to describe the same shipment accurately.
Multiple transfers can make it harder to connect a cargo’s later delivery to the vessel that first carried it or to establish where the commodity originated. OFAC’s 2025 advisory on Iranian petroleum says shipments of Iranian crude often involve three to five STS transfers to obscure the crude’s origin or the participation of sanctioned tankers. That figure is specific to the activity described in the Iran advisory; it is not a universal pattern for all oil shipments or all sanctions-evasion cases.
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OFAC says liquefied petroleum gas shipments may use fewer transfers and still rely on non-sanctioned vessels for eventual delivery. A vessel that is not itself sanctioned can therefore appear later in a chain that warrants investigation. Conversely, the presence of a transfer or a non-sanctioned vessel in a chain does not establish that a transaction is illicit.
Why repeated handoffs can matter
A transfer is more concerning when it appears to have little commercial purpose and is part of a broader pattern. OFAC identifies successive transfers with little commercial rationale, operations at night, unsafe waters, proximity to sanctioned jurisdictions, terminals or refineries, and missing or manipulated AIS as risk factors. Each clue has to be assessed in context: geography, timing and signal behavior are not verdicts on their own.
What makes a pattern more or less concerning?
The following comparison is a practical way to organize questions, not a standalone legal test. The same observation can have an innocent explanation; the weight comes from whether separate evidence agrees or conflicts.
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| Question | More consistent with an explainable anomaly | Higher-risk pattern to investigate |
|---|---|---|
| What happened to AIS? | An isolated reception gap, with no corroborated identity or location conflict. | Repeated gaps or data that conflicts with vessel identity, movement or other records. |
| How many transfers occurred? | A transfer with a plausible commercial rationale and a traceable record. | Successive transfers with little apparent commercial purpose, particularly where handoffs are poorly documented. |
| When and where did the transfer occur? | Available records describe the location and circumstances consistently. | Night operations, unsafe waters, or proximity to a sanctioned jurisdiction, terminal or refinery add to other warning signs. |
| Do cargo records agree? | Bills of lading, origin certificates, invoices, packing lists and transfer information tell a consistent story. | Documents are missing, manually changed, reissued without a clear explanation, or inconsistent about origin, destination or last ports of call. |
| What do vessel and counterparty records show? | Identity, flag, ownership and insurance information can be reconciled across the transaction. | Repeated administrative changes, concealed beneficial ownership, questionable registration or inadequate insurance compound other concerns. |
These comparisons draw on OFAC’s maritime advisories and the IMO’s guidance. They do not determine whether a particular vessel or transaction violated sanctions. That conclusion requires the applicable legal rules and evidence specific to the parties, cargo and jurisdiction.
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Check records as well as tracking signals
Tracking data is only one part of provenance. OFAC describes manipulation of documents used to conceal cargo origin or destination, including bills of lading, certificates of origin, invoices, packing lists, proof of insurance and lists of last ports of call. Cargo documents may be manually altered or reissued. A plausible AIS track cannot resolve a conflict in those records, and a complete document set is not conclusive if it contradicts movement evidence.
For a transaction review, compare the vessel and cargo information across the available records instead of treating each document as an isolated formality. Check whether the sequence of vessels, transfer dates, stated origins and destinations, and last ports of call fits together. Where relevant and available, OFAC also recommends reviewing transfer information and oil-record logs, and cross-checking AIS with Long-Range Identification and Tracking (LRIT) data. LRIT is an additional source to consult where a stakeholder has access; it is not a universally available substitute for investigation.
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A practical review sequence
- Establish what is known. Record the vessel identifiers and the available movement history. Distinguish a missing AIS reception from evidence that the vessel deliberately disabled or falsified its transmission; do not infer the cause from a blank segment alone.
- Compare identity and position. Look for conflicts among the reported identity, vessel records and track. Treat an apparent mismatch—including a reported MMSI or IMO number that does not fit the vessel—as a discrepancy to verify, not an automatic conclusion about intent.
- Reconstruct the cargo chain. List each reported STS transfer and the vessels involved. Ask whether the number and sequence of handoffs have an evident commercial rationale and whether records describe the same cargo consistently.
- Reconcile documents. Compare bills of lading, origin certificates, invoices, packing lists, insurance evidence, last-port information, transfer records and, where relevant, oil logs. Investigate missing or inconsistent information and unexplained changes.
- Assess the wider vessel and transaction context. Consider location and timing alongside flag or registration changes, ownership transparency, insurance and maintenance information, and the counterparties involved. A concern becomes more meaningful when independent indicators point in the same direction.
- Escalate proportionately. Where access permits, compare AIS with LRIT and follow applicable due-diligence and reporting obligations. OFAC also recommends monitoring high-risk STS activity and following relevant MARPOL notification requirements for oil transfers. A single anomaly should prompt verification, not an unsupported accusation.
Why investigators avoid treating an AIS gap as proof
The IMO’s Assembly Resolution A.1192(33), adopted December 6, 2023, says that non-receipt of AIS transmissions by shore stations or AIS satellites “may not be determinative of illegal activity but may warrant further investigation.” This distinction is central: a transmission gap can be a useful signal to check, but it cannot establish the reason for the gap by itself.
That caution also protects against confusing different evidence problems. A ship can be out of reception without having falsified its identity; falsified data can be presented as a seemingly usable track; and an STS transfer can occur without sanctions evasion. Investigators need evidence that joins the signal, vessel and cargo records into a coherent account—or exposes material inconsistencies among them.
Safety and registration issues extend beyond sanctions
Concealed movements and weak vessel oversight can also create maritime safety and environmental risks. The IMO has linked open-ocean STS operations and characteristics associated with a “dark fleet”—including poor maintenance and inadequate insurance—to greater collision, pollution and liability risks. These are broader risks, not proof that every vessel described as part of a dark fleet has caused harm.
In 2023, information presented to the IMO Legal Committee described a dark fleet of 300–600 tankers. That is a historical estimate presented to the committee, not a current fleet census. In April 2026, the IMO Legal Committee reported that 529 ships had falsely flown a country’s flag in the preceding year. The latter figure concerns fraudulent flag use as reported in the IMO’s announcement; it should not be mistaken for a count of sanctioned tankers or of all vessels involved in AIS manipulation.
In the same April 2026 announcement, the IMO said its Legal Committee had approved guidelines intended to improve transparency and due diligence in ship registration. The IMO described the measures as guidelines and stated that there was no binding international framework regulating ship registration at that time. They are not a binding worldwide treaty. They address registration due diligence, a related vulnerability, rather than making an AIS gap or STS transfer proof of sanctions evasion.
What ordinary readers can—and cannot—conclude
Satellite-based tracking and comprehensive records of vessel movements and STS transfers are part of the G7’s institutional maritime-domain-awareness approach. They should not be confused with tools or records available to every individual reader. Access to LRIT, detailed cargo documents, oil logs and authoritative ownership or insurance information may depend on a person’s role and jurisdiction.
For anyone reviewing a public vessel track, the responsible conclusion is limited: an AIS gap, identity inconsistency or transfer may raise a question, but public tracking alone may not resolve it. Use precise language—“possible discrepancy” or “risk indicator”—unless corroborating evidence supports a stronger claim. Sanctions findings are legal and fact-specific, so a pattern of indicators is a reason for appropriate due diligence, not a substitute for it.
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