Introduction
The 12th session of the IMO Sub-Committee on Navigation, Communications and Search and Rescue (NCSR 12) concluded in London on 22 May 2025, bringing forth a series of amendments and new guidelines that will shape maritime navigation and communication practices in the years to come.
For shipowners, operators, marine surveyors, and safety managers, understanding these regulatory updates is essential to ensure compliance and maintain operational readiness.
In this article, we highlight the most relevant outcomes and their impact on your operations.
Introduction of VDES (VHF Data Exchange System) into SOLAS
NCSR 12 finalized draft amendments to SOLAS Chapter V to support the voluntary introduction of VDES, a next-generation communication system that integrates AIS and application-specific messages (ASM) via both terrestrial and satellite links.
Key takeaways:
- VDES may be used in place of AIS starting from 1 January 2028
- Draft performance standards and operational guidelines have been completed
- Related amendments to HSC Codes and Safety Certificates (Forms P, E, C) are expected
Why it matters:
VDES is expected to support higher data volumes, enabling more advanced services such as dynamic route exchange, weather routing, and remote diagnostics.
Guidelines for Electronic Nautical Publications (ENPs)
The sub-committee finalized new IMO-level guidelines for ENPs, addressing SOLAS regulations V/19.2.1.4, V/19.2.1.5, and V/27.
Highlights:
- Focus on hardware/software requirements, power backup, and document redundancy
- Guidelines apply to digital equivalents of traditional publications, not ECDIS systems
- Immediate effect upon expected approval in May 2026
Why it matters:
This ensures global uniformity in digital navigation documentation and strengthens flag/state audit readiness.
Software Maintenance for Navigation and Communication Systems
Recognizing increasing cybersecurity concerns, NCSR 12 completed draft guidelines for software maintenance applicable to systems regulated under SOLAS Chapters IV and V.
Features include:
- Secure and standardized maintenance lifecycle
- Mandatory electronic service records
- Guidance on remote maintenance and service provider certification
Why it matters:
These guidelines address operational risks and reduce system downtime, improving navigational safety and digital resilience.
Progress on NAVDAT and ECDIS S-100 Data Exchange
NCSR 12 reviewed a draft roadmap and technical framework for NAVDAT (digital navigational data system) and IP-based connectivity to support S-100 capable ECDIS.
Pending items to be finalized at NCSR 13 include:
- Communication protocols (MCP, SECOM)
- Real-time shore-to-ship data integration
- Training for crew and shore-based personnel
Why it matters:
This transition lays the foundation for next-generation ECDIS, enabling smart navigation and decision support systems.
GMDSS and Search and Rescue (SAR) Enhancements
Key updates affecting maritime safety and SAR operations include:
- Mandatory dissemination of MSI/SAR information via all Recognised Mobile Satellite Services by December 2026
- Revisions to the IAMSAR Manual and guidance on psychological first aid
- Updates to DSC distress alert procedures aligned with ITU-R recommendations
Why it matters:
Enhanced interoperability and redundancy across SAR and GMDSS systems will improve emergency response capability.
BeiDou GNSS Receiver Performance Standards Revised
NCSR 12 endorsed the updated performance standards for shipborne BeiDou receiver equipment, aligning with the satellite system’s global capabilities and improved signal structure.
Why it matters:
The update supports dual-frequency operations and enhances positioning accuracy, especially in challenging coastal or congested zones.
Conclusion
The upcoming years will see the adoption and enforcement of these measures through MSC sessions 110 to 112. Marine Surveyor Consultant Sagl recommends that shipowners and operators:
- Start planning for VDES integration
- Ensure digital publication systems are audit-compliant
- Evaluate and update software maintenance procedures
- Prepare for the S-100 ECDIS transition
- Stay aligned with GMDSS/SAR developments
👉 For professional support on compliance audits, safety management systems, or navigation assessments, contact our team or visit our consultancy services section.
