The Global Maritime Distress and Safety System (GMDSS) is the backbone of maritimeemergency communication — and it has just undergone its most significant modernization sinceits original introduction. The updated GMDSS framework, implemented through SOLAS 2024amendments, moves the industry firmly into the satellite era.

Key Changes to GMDSS

One of the most immediate changes affects Emergency Position-Indicating Radio Beacons(EPIRBs). VHF-EPIRBs are no longer accepted for Sea Area A1 coverage. Vessels operating inSea Area A1 must now carry satellite EPIRBs. This is a critical upgrade: satellite EPIRBs transmitdistress signals globally via the COSPAS-SARSAT system, ensuring that a vessel’s position canbe detected even in the most remote ocean environments.
Sea areas have been reclassified, and MF/HF radio is now limited to Sea Area A4 operations.Narrow-Band Direct Printing (NBDP) distress signaling — a decades-old technology — has beenremoved from the framework entirely.
The updated GMDSS also replaces specific references to Inmarsat with the broader category ofRecognized Mobile Satellite Services (RMSS), which now includes Iridium. This opens the door
to competitive satellite communication options while maintaining the highest standards ofreliability and coverage.

EPIRB Requirements for Offshore Units

For offshore platforms and vessels, EPIRB compliance deserves particular attention. Any EPIRB registered after 2015 is required to include an internal GPS — enabling faster, more accurate position reporting to rescue authorities. Category 1 EPIRBs must be installed to float free and automatically activate upon immersion.

What This Means in Practice

Vessels operating with legacy GMDSS equipment that does not meet the new satellite-based standards will face PSC issues during inspections. The modernization of GMDSS is not just about technology — it is about ensuring that when a distress signal is sent, the response is as fast and effective as possible.
Existing GMDSS certificates remain valid until their expiry dates under the transitional provisions of MSC-MEPC.5/Circ.6. However, operators should plan equipment upgrades proactively rather than waiting for renewal surveys.
Our team provides GMDSS equipment inspections, EPIRB testing and registration services, and compliance assessments for marine and offshore clients. We help ensure your distress communication systems meet current standards.