Insight | A broader safety platform for vessels in distress


A broader safety platform for vessels in distress


Following the decision to include L-band connectivity in the International Maritime Organization’s (IMO) Global Maritime Distress System (GMDSS), real progress can be made in the functionality of the satellite-based emergency service seafarers call on in the last resort.

Recent progress at the IMO to modernise the free-at-point-of-use GMDSS has major consequences for the messaging functionality and last resort connectivity available to the world’s 1.65 million seafarers.

GMDSS effectively gives seafarers their own emergency service, accessing satellite and terrestrial technology to ensure that vessels in peril can always get through to a Maritime Rescue Coordination Centre (MRCC), so search and rescue (SAR) operations can be launched. Under the Safety of Life at Sea (SOLAS) convention, cargo ships of 300GRT and upwards and passenger ships on international voyages must have GMDSS-compliant satellite equipment installed which meet 99.9% service availability and other performance standards set out by IMO in A 1001(25).

These criteria have been devised to ensure that, wherever a ship is in the world, its Master needs only press and hold the Dedicated Distress Button (DDB) on the satellite terminal for four seconds to trigger transmission of an undesignated distress alert containing the vessel’s details and position. If time permits, the Master can choose to add extra information, such as the nature of the emergency, before sending the alert. Alerts travel via satellites to the Land Earth Station and the vessel is logged in direct to the associated MRCC.

Distress alerts – both ship-to-shore and shore-to-ship – have the highest priority over all other traffic over the satellite network, which means any non-distress connection will be superseded to ensure they get through immediately. Once the distress alert is received, the MRCC will respond to check it is not a false alarm. When they receive confirmation, or if they get no further response, the MRCC instigates SAR operations, including sending a distress alert relay to other vessels in the area.

Critically, the messaging architecture behind the GMDSS has been developed to prevent incidents happening in the first place, by supporting the transmission of Maritime Safety Information (MSI) warnings that include navigational hazards and approaching storms.

Full-scale modernisation required

However, the GMDSS was originally adopted in 1988, with its deployment phased in from 1992 until full implementation in 1999. Although there have been enhancements over time, a full-scale modernisation has become pressing to take advantage of significant advances in satellite infrastructure and maritime software/hardware.

The undertaking is a multi-year project, as IMO reviews technical progress and overhauls GMDSS rules and the way they have been embedded in one of IMO’s most important instruments – the Convention for the Safety of Life at Sea (SOLAS). Although underway for some time, the full outcome of detailed work will take three further sessions of the UN agency’s Navigation, Communications and Search and Rescue (NCSR) sub-committee, with support from other sub-committees also required, for example to develop seafarer training model courses. IMO envisages 2024 as the entry into force date for new generation, data-rich GMDSS services, based on the regulatory framework being in place by 2021.

Nevertheless, 2018 has proved pivotal for GMDSS. From its inception, only Inmarsat has met the performance standard set for GMDSS, through Fleet 77 and then subsequently Inmarsat C services. However, May’s Maritime Safety Committee meeting approved L-band connectivity for the first time as being proven as meeting its GMDSS performance standard.

Approval was given to Fleet Safety, Inmarsat’s FleetBroadband and Fleet One services, but also to Iridium’s ‘NEXT’ service, available from 2020 via new generation Low Earth Orbit satellites. Furthermore, IMO accepted a request from China’s BeiDou Navigation Satellite System to evaluate a third new proposal for GMDSS.

What L-band connectivity means for safety at sea

To date, Inmarsat has made the most extensive disclosures on what a shift to L-band connectivity will mean for GMDSS at sea. Its L-band FleetBroadband service was introduced in 2007 and already supports 50,000 terminals in service operating over the existing Inmarsat-4 constellation. Inmarsat’s new I-6 satellites, due to enter service in the early 2020s, will offer hybrid L-band/Ka-band connectivity. Inmarsat’s new generation 1Mbps-plus maritime safety terminal incorporating FleetBroadband for voice and data communications and additional features such as distress chat has been part of the IMO’s performance approvals of Fleet Safety.

While the mandatory role set out for satellite operators in GMDSS ends with providing the approved satellite system, their responsibilities are more extensive given that distress alerts will be carried over the relevant network. Today, for example, Inmarsat’s Network Operations Centre team receives notification of all distress alerts and monitors MRCC responses to ensure they are being actioned. If for any reason the alert has not been answered, an Inmarsat team member will call the nearest MRCC to request urgent assistance.

In line with this established practice, Fleet Safety is a three-sided upgrade for GMDSS modernisation that also includes the newly-developed SafetyNET II and RescueNET messaging services. These supersede the existing messaging architecture that has been keeping ships at sea in touch with the Maritime Rescue Coordination Centres (MRCCs) coordinating search and rescue services worldwide via Inmarsat. Both are broadcast over Inmarsat C, Mini C and FleetBroadband simultaneously, with web-based SafetyNET II replacing the internationally-established SafetyNET system for broadcasting and reception of Maritime Safety Information (MSI). RescueNET, meanwhile, enhances MRCC communications by enabling real-time coordination during a search and rescue.

"Inmarsat's RescueNET system is a great step-forward in Maritime SAR, enhancing cross-border co-ordination of SAR operations and improving communication between adjacent RCCs and vessels in the vicinity of a maritime incident.
Thank you again Inmarsat for presenting this excellent tool to the SAR community!"

Vladimirs Sadoha, Latvian Navy Coast Guard, MRCC Riga

Both SafetyNET II and RescueNET also allow the person who has sent a message to monitor its status and see whether it has been sent, scheduled or cancelled and broadcast correctly, while also being able to view available MRCCs registered on the system, including the email and telephone number. If a Fleet Safety Distress Alert is sent to an MRCC that is off-line, the system automatically redirects the Distress to an appropriate geographically defined MRCC, with Inmarsat’s Network Operation Centre (NOC) also monitoring traffic; if an MRCC is off line for more than 60 seconds, the NOC is alerted and contacts the MRCC for assistance.

MRCCs are already transitioning to SafetyNET II, which officially went live in November 2017. In fact, the service assisted maritime rescue operations during its trial period, including the June 2017 retrieval of a fishing vessel crew by MS Albatros, after three days adrift 200 nautical miles off Tonga. Rescue Coordination Centre New Zealand Manager, Mike Hill, says: “Fleet Safety and, in particular, SafetyNET II proved itself as of great use in assisting in these rescues.”

Working via Inmarsat C, Mini C and FleetBroadband, RescueNET is also already being used by more than 20 countries. Here, new functionality includes distress chat, whereby the MRCC can enable simultaneous communication with multiple MRCCs and vessels for SAR co-ordination.

Search and rescue trials featuring RescueNET were recently completed to the satisfaction of the Riga MRCC, Latvia, drawing on the Fleet Safety capability onboard the Stena vessel Stena Nordica. “One of the most important things is that Inmarsat managed to bring maritime units into the ‘RCCs Chat’, which will enhance the communication between adjacent RCCs, the casualty and the vessels in the vicinity of an incident,” said Vladimirs Sadoha of Latvia’s Coastguard Service.

These views draw attention to the critical relationships required between satellite service providers, Maritime Safety Information Providers (MSIPs) and maritime safety agencies to sustain GMDSS. As noted, however, going forward Inmarsat will no longer be the sole satellite operator approved to offer GMDSS services. And, although a timetable has been set for modernising GMDSS, the path towards interoperability and managing the multiple relationships between suppliers and MRCCs has not so far been laid.

About the author

Peter Broadhurst is responsible for the development of Inmarsat’s safety and security services. He defines the strategy, development and evolution of Inmarsat’s satellite communication services for maritime safety, navigation, safety of life at sea and data security.

Peter started his career at Inmarsat in 2014 as Vice President of Service Delivery for the Maritime Business Unit and was instrumental in the launch of Inmarsat’s high-speed broadband service Fleet Xpress in March 2016. With over 25 years’ experience in the maritime industry, Peter began his career at sea as a Radio Officer.