A gap is not always suspicious. An unexplained gap is always a question.
Online platforms give maritime operators access to more vessel, voyage and threat data than ever before. Yet no maritime risk assessment system has a complete view of every vessel, counterparty, port and emerging threat.
The main causes of risk assessment gaps are incomplete or delayed source data, limitations and manipulation of Automatic Identification System (AIS) transmissions, cyber and positioning-system interference, fragmented compliance records, inflexible risk models and insufficient analyst coverage.
These weaknesses can produce false confidence. A dashboard may look complete while the information behind it is stale, ambiguous or missing the context needed to support a decision.
Maritime decisions are rarely based on one question.
Operations teams need to know whether a route is safe, whether a port presents additional security requirements, whether a nominated vessel has relevant incident history and whether the parties behind a transaction create sanctions or regulatory exposure.
A gap in any one of those areas can affect the wider decision.
For example, incomplete vessel history could conceal a relevant ownership change. An unexplained AIS outage could obscure a port call or ship-to-ship transfer. A regional threat assessment that has not been updated could leave a voyage plan based on conditions that no longer exist.
The consequences generally fall into four categories:
The problem is therefore not simply missing data. It is uncertainty that has not been identified, explained or incorporated into the decision.
Maritime risk intelligence is assembled from multiple sources. These can include coastal reporting centres, flag and registry records, sanctions lists, incident reports, port information, weather advisories, vessel particulars, ownership data and commercial tracking services.
Those sources do not necessarily use the same identifiers, terminology or update schedule. A vessel name may change. Ownership can be distributed through several corporate entities. A port or incident may be described differently across reporting systems.
When online risk management systems combine these records without preserving their origin, timestamp and confidence, conflicting information can be presented as a single established fact.
Source provenance matters because risk managers need to answer three basic questions:
Without those answers, more data does not automatically produce a better maritime risk assessment.
AIS is central to modern maritime visibility, but it was designed as a safety and identification system, not as a complete global record of vessel activity.
The International Maritime Organization explains that AIS provides information such as vessel identity, position, course, speed and navigational status. Carriage requirements apply to specified categories of passenger and commercial vessels, while certain vessels may be exempt.
This creates several potential gaps.
AIS operates through VHF transmission. Terrestrial reception is affected by radio range, antenna position and surrounding obstructions. Satellite and commercial data services can extend visibility, but availability and reporting frequency may still vary by location, provider and vessel activity.
A missing position can therefore reflect a receiver or coverage limitation rather than a deliberate action.
Incorrectly configured equipment, antenna problems, power loss and manually entered information can create inaccurate or inconsistent records. Static details such as vessel type, destination and draught may be incomplete or outdated even when the transmitted position is correct.
Ships fitted with AIS are generally expected to keep it operating. However, international rules recognise limited circumstances in which navigational information may need protection.
A vessel may therefore have a legitimate security reason for an apparent gap. That explanation should be documented and assessed in context.
AIS can also be disabled or manipulated to conceal a vessel’s identity, location, port calls or ship-to-ship activity.
A 2025 US Treasury maritime sanctions advisory describes vessels modifying identification data, using identifiers associated with other vessels and disabling AIS to obscure movements. The advisory recommends investigating vessels through multiple identification and location data points.
An AIS gap is therefore an indicator, not a conclusion. The duration, location, preceding route, subsequent activity, vessel identity and available explanation all matter.
AIS positions and many other maritime systems depend on Global Navigation Satellite Systems. If the underlying positioning signal is disrupted or falsified, apparently valid information can be wrong.
In March 2025, the IMO, International Telecommunication Union and International Civil Aviation Organization raised concern about increasing GNSS jamming and spoofing. Such interference can affect navigation, timing and communications systems.
Cyber incidents create an additional problem. They can affect the availability, integrity or confidentiality of shipboard and shore-based information.
The IMO’s current maritime cyber-risk guidance treats corrupted, lost or compromised systems and data as potential causes of operational, safety and security failures. Cyber risk is expected to be addressed through existing safety management processes.
For risk managers, this means maritime safety technology cannot be assumed to be accurate simply because it is automated. Systems need ways to identify anomalous data, degraded coverage and conflicting sources.
Maritime compliance screening is more complicated than checking a vessel name against a sanctions list.
Risk can sit within a vessel’s ownership, operator, manager, flag history, trading pattern, counterparties or cargo documentation. Names can be changed or transliterated in different ways. Corporate ownership structures may obscure the parties that ultimately control an asset or transaction.
Sanctions lists also change. A screening result is tied to the lists, data and identifiers available at the time it was completed.
Risk assessment gaps can emerge when a system:
A clear result should support due diligence, not replace it. Higher-risk cases may require additional documentation, ownership research and review by qualified compliance or legal personnel.
Automation can process large volumes of information. It cannot guarantee that the information has been interpreted correctly.
Analyst coverage gaps arise when a provider lacks sufficient regional expertise, language capability, source access or review capacity. They can also appear when analysts are expected to monitor too many regions or alerts without clear prioritisation.
Important differences may then be lost. A local incident can be reported as part of a wider trend when it is isolated. A change in threat-actor intent may be missed because the number of incidents has not changed. A warning may remain in a system after its operational relevance has expired.
Good analysis should distinguish:
Analyst review does not eliminate uncertainty. It makes that uncertainty visible and easier to manage.
Many systems compress complex shipping industry risks into a colour, category or numerical score. This can help teams prioritise attention, but it can also create false precision.
Two assessments with the same risk level may have very different foundations. One may be supported by several recent, independent sources. Another may rely on limited reporting and a historical pattern.
A useful maritime risk assessment should explain why a risk level was assigned. It should also show the assessment’s validity period, confidence, assumptions and reassessment triggers.
The score is the beginning of the decision, not the evidence behind it.
Even a technically strong system can fail if it is not embedded in operational workflows.
Common weaknesses include:
A risk platform needs to support the way decisions are made, briefed and reviewed. Otherwise, intelligence remains separate from operations.
Voyage planning depends on conditions that can change quickly.
A route assessed as acceptable may later be affected by conflict escalation, piracy, electronic interference, new reporting requirements, port restrictions or insurance considerations. If those changes are not identified and reviewed, the original assessment can become misleading.
Risk gaps can lead operators to:
Effective planning therefore needs a defined assessment window and clear triggers for review.
No provider can remove every unknown. A stronger system should make gaps visible and help users decide what additional review is required.
Risk managers should look for the following capabilities:
Incidents and assessments should retain their sources, timestamps and relevant attribution.
AIS, vessel identifiers, ownership, sanctions, incident and regional intelligence should be assessed together rather than in isolation.
Material assessments should be reviewed by people who can test assumptions, resolve conflicts and explain the limits of the available evidence.
The system should state how confident the assessment is, how long it remains valid and what would trigger reassessment.
Screening results and assessments should be retained in a format suitable for internal review, due diligence and operational briefings.
An anomaly should lead to a defined review process, not an automatic accusation or an ignored alert.
The objective of a maritime risk assessment is not to create the impression of perfect visibility. It is to give decision-makers the clearest defensible picture available while identifying what remains unknown.
Dryad Global’s Verihelm maritime risk intelligence platform brings regional and threat intelligence, voyage and port risk, vessel profiles and sanctions screening into one environment. Incidents retain source metadata, while published assessments receive analyst review before release.
That combination helps teams move from an isolated signal to a decision that can be understood, briefed and revisited.
Maritime intelligence, verified.
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This article provides general risk intelligence and does not constitute legal or vessel-specific operational advice.
A maritime risk assessment identifies and evaluates the threats, vulnerabilities and operational factors that could affect a vessel, voyage, port or maritime transaction. It should explain the evidence, uncertainty and measures that decision-makers may wish to consider.
AIS gaps may result from limited receiver coverage, equipment or antenna problems, incorrect configuration, legitimate security decisions, deliberate disablement or data manipulation. A gap should be investigated in context rather than treated as automatic proof of wrongdoing.
No. An AIS gap is an indicator that may justify further review. Investigators should consider its location, duration, the vessel’s wider voyage history, identity records, ship-to-ship activity and any documented explanation.
They can hide relevant vessel, ownership or voyage information, produce incorrect screening results and weaken the audit trail supporting a compliance decision.
Not entirely. Maritime operations involve incomplete reporting, changing conditions and deliberate concealment. The practical objective is to identify gaps, corroborate important information and make uncertainty explicit.
It should provide source-traced information, current screening data, contextual vessel and voyage intelligence, analyst review, clear confidence levels, reassessment triggers and records that can support operational and compliance decisions.