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Cyber resilience in the maritime industry is commonly viewed as a technical problem that needs to be solved. It is not. It is fundamentally a governance issue. Firewalls and software patches are useful, but without a structured approach to oversight and integration with operational management, they are of limited use.

Cyber seaworthiness must be viewed with the same level of gravity as physical seaworthiness. It is a demonstrable condition, one that can be audited, tested, and verified. The following framework describes how maritime companies can develop a defensible position on cyber resilience that meets regulatory requirements.

Step 1: Understand your exposure

Every successful cyber strategy begins with understanding. A comprehensive cyber risk assessment must extend beyond shore IT infrastructure and into the operational technology (OT) environment onboard the ship.

This assessment should examine:

• Vessel systems and OT environments
• Shore-based infrastructure
• Third-party service providers
• Satellite and communications networks
• Remote access connections

To map risk exposure, it is necessary to identify key systems, understand dependencies, and identify single points of failure. Maritime systems such as navigation systems, propulsion systems, cargo management systems, and communication systems are often interlinked in complex ways that are not immediately obvious. 

Step 2: Align with regulatory expectations

Cyber risk management is not optional in the maritime industry. It is part of the international compliance regulatory framework. It is also subject to increasing scrutiny from insurance companies, flag states, and classification societies. It is therefore essential to understand the regulatory requirements, such as:

• International Maritime Organisation 2021 cyber risk management requirements under the ISM code
• National Institute of Standards and Technology cybersecurity framework
• ISO 27001
• BIMCO guidelines on cyber security onboard ships

Crucially, cyber risk must be integrated into the vessel’s safety management system (SMS). It cannot sit as a standalone policy. Integration means cyber controls influence operational procedures, maintenance routines, training schedules, and audit cycles.

Step 3: Separate IT and OT

The most common and risky cybersecurity threat in the maritime industry is the flat network structure. This is where crew welfare, IT, and OT, share the same network space. It is, therefore, essential to separate the network. 

Best practice includes:

• Network segmentation between IT and OT
• Firewalls separating navigation systems from crew internet access
• Restricted and monitored USB usage
• Controlled and logged remote maintenance protocols
• Multi-factor authentication for privileged access

Segmentation reduces the blast radius of an incident. A compromised crew laptop should never provide a pathway into bridge or engine control systems.

Step 4: Establish incident response protocols

Cyber incidents develop in minutes, not days. Ransomware propagation, data exfiltration, and operational disruption are activities that may speedily escalate in the event that roles or escalation paths are unclear.

A vessel must have well-defined cyber response protocols in place that are compatible with the shore-based crisis management team.

A cyber drill is as important as a fire drill. Practicing response under controlled conditions will help to identify gaps in communication and authority before a real cyber incident occurs.

Step 5: Train your crew

While technology is important in the fight against cyber threats, the reality is that the majority of maritime cyber incidents are caused by the human elements. The most common types of cyber incidents in the maritime industry are phishing emails, infected removable media, and weak passwords. 

The awareness level of the crew is the first line of defense against cyber threats. Training must be realistic and scenario-based. It must reflect real-world risks faced onboard, including fraudulent service engineer visits, malicious USB devices, and spoofed communications.

Cyber seaworthiness depends as much on informed behavior as on secure infrastructure.

Step 6: Document everything

In the aftermath of a cyber incident, particularly where insurance claims or regulatory investigations arise, documentation becomes decisive.

Organisations should maintain auditable records of:

• Patch and update logs
• Crew training records
• Incident logs and response timelines
• Risk assessments and mitigation plans
• Governance and board-level meeting minutes addressing cyber oversight

Cyber seaworthiness must be demonstrable. If controls, oversight, and training cannot be evidenced, they may not be recognised in a coverage dispute or compliance review.

Building cyber seaworthiness is not about purchasing more software. It is about embedding accountability, visibility, and structured response into maritime operations. When cyber risk is governed with the same rigor as physical safety, resilience becomes measurable and defensible.

The vessels that will withstand future scrutiny from regulators, insurers, and courts are not those with the most technology, but those with the clearest governance.