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All three General Lighthouse Authorities (GLA) of the UK and Ireland - Trinity House, the Northern Lighthouse Board and Irish Lights - will discontinue their Differential GPS (DGPS) service in March 2022.

The GLAs made this decision after carefully considering the results from an extensive consultation carried out with stakeholders and service users. They will cease transmission of the signal after 31 March 2022.

It was in 1995 that the GLAs introduced DGPS as part of the mix of marine aids to navigation (AtoN) provided to safeguard mariners within their combined waters and to help protect the environment. The system became fully operational in 1997. The system consists of 14 DGPS reference stations, six far-field monitoring sites and three monitoring and control sites. The system is operated as a single AtoN, operated and maintained by the three GLAs.

Dr Alan Grant, GLA DGPS System Director, said: “After careful consideration of the results of the consultation process, the three GLAs have concluded that their DGPS system is now redundant. Today’s GNSS are able to meet all but the most stringent accuracy requirements, and position integrity can be provided by alternative means (RAIM or other visual and electronic aids to navigation).

“The GLAs recognise the need to provide adequate notice and support continuity of service going forward. As such, the DGPS system will remain operational until 31 March 2022, at which point the signals will cease.”

Background

Marine radiobeacon DGPS was developed by the GLAs to counter Selective Availability (SA), a deliberate error added to the civilian GPS service to degrade its positional accuracy. The DGPS correction to the position error meant an improvement in accuracy from approximately 50m to around 5m.

In addition to improving the estimated position accuracy, by assessing whether the error is within a given threshold, the reference station is able to monitor the performance of the GPS constellation and identify any faults. Faulty satellites are removed from the position solution, providing position integrity for the mariner.

SA was discontinued in 2000 and GPS now offers the civilian user a position accurate to around 3-5m. DGPS still improves positional accuracy - now enabling positions in the region of 1-2m - but it is the position integrity function that is most often cited as the main benefit of DGPS.

While marine radiobeacon DGPS is not mandated by the International Maritime Organization for carriage on SOLAS vessels, it is provided for in all maritime receiver standards and the spectrum is allocated internationally.

Consultation 

The infrastructure required to run the service is approaching the end of its design life; the GLAs conducted a stakeholder consultation to assess the requirements for the service going forward, surveying and interviewing stakeholders from across the maritime sector and beyond.

Of the responses received, 86% were from mariners and maritime operators, operating a wide range of vessels including ferries, container ships, tankers, liquid natural gas carriers, bulk carriers and leisure craft.

The survey resulted in a mix of responses, with the majority of mariners reporting that they use the DGPS system for accuracy improvements and integrity, while others reported that they do not use it.

All mariners reported using GPS today with around 40% also making use of GLONASS, and around 9% using Galileo too. From the response received, it is expected that more mariners will move to multi-constellation receivers, making use of GPS, GLONASS, Galileo and BeiDou over the next five to ten years.

Maritime Safety 

Following a change in maritime receiver standards in 2003, all receivers now include Receiver Autonomous Integrity Monitoring (RAIM). RAIM is a means of determining whether the resulting position estimate is safe to use through an algorithm within the receiver.

Differential corrections are also available from other sources, including Satellite Based Augmentation Systems (SBAS), which are primarily provided for aviation users. Work is under way in Europe to introduce a maritime service to EGNOS, the European SBAS. This service is expected to be available around 2022.

Vessels that need high accuracy position and integrity for operations mainly utilise a number of commercial satellite-based services; the decision to discontinue DGPS has no operational impact on these services.

The GLAs advise mariners to consider their use of DGPS and to plan for its discontinuance accordingly. Mariners should check their GNSS receiver(s) to confirm the presence of RAIM and consider upgrading to type-approved SBAS receiving equipment when available.

The GLAs encourage mariners to use all available AtoN - whether visual or electronic - to support their safe passage and the protection of the environment.

To download a PDF copy of the full DGPS article by Dr Alan Grant click here

Published in Lighthouses

Sailing was not the only activity that took place in Dublin Bay last Saturday as the Northern Lighthouse Board's (NLB) multi-function tender NLV Pharos was busy at work, writes Jehan Ashmore.

The NLB is the Scottish equivalent of the Commissioners of Irish Lights (CIL) and it is not unusual for such vessels to share work duties beyond their respective jurisdictions. The 84m NLV Pharos is equipped with dynamic positioning and a 30-tonne main crane on her 300m2 aft-deck.

Overall she is similar in appearance to Irish lights ILV Granuaile which is based out of Dun Laoghaire. The Irish Lights tender built in Romania in 2000 tends to operate more often off the west coast during the summer months due to the more favourable weather conditions.

The 1,300 (dwt) deadweight tonnes NLV Pharos yesterday returned to her base in Oban from her Irish duties. The west coast base was established in 1904 and is also homeport to the service's smaller NLV Pole Star which is equipped with an 18-tonne crane on her 90m2 aft deck.

The facility in 2000 underwent a £4.2 million redevelopment to turn a buoy yard into a multi functional support base which is computer-linked to the NLB headquarters in Edinburgh.

In addition Trinity House which maintains the service for England and Wales operate the tenders THV Galtea,THV Patricia and the fast-response craft THV Alert from their base in Harwich.

Trinity House forms the trio of the General Lighthouse Authorities (GLA) alongside NLB and CIL. Each member of the GLA co-operate in the allocation of vessel-tender deployment.

Asides the varied and critical role of the tasks performed by the GLA's tenders, they are also available for charter to third parties. Between them the tenders can conduct buoy and chain work, search and rescue, lighthouse re-fuelling, salvage and recovery, towing, hydrographic applications and ROV work.

Published in Lighthouses
Britain is to stop paying towards the cost of funding the Commissioners of Irish Lights (CIL) according to a report in Lloyds List. In an agreement reached between London and Dublin, a formal announcement on the timetable for removing the subsidy is expected shortly.
The Irish Government has agreed to pay for its own lighthouses, buoys and other marine aids to navigation. The UK subsidy is likely to be eliminated during the current parliament if all goes according to plan. That is the pledge made by Mr Penning, UK Minister of Shipping on several occasions in recent months. The phase-out will start in the next financial year.

The total cost of providing these services comes to around £75m ($116.5m) a year, of which Irish Lights accounts for €32m. The UK subsidy to Ireland is between £10m and £12m, with the Irish government contributing some £6m and the balance coming from fees.

All three general lighthouse authorities (GLA) are working on ways to cut costs and improve efficiencies, with a joint strategic board set up to consider how they can work together more effectively.

Published in Lighthouses

The Irish Coast Guard

The Irish Coast Guard is Ireland's fourth 'Blue Light' service (along with An Garda Síochána, the Ambulance Service and the Fire Service). It provides a nationwide maritime emergency organisation as well as a variety of services to shipping and other government agencies.

The purpose of the Irish Coast Guard is to promote safety and security standards, and by doing so, prevent as far as possible, the loss of life at sea, and on inland waters, mountains and caves, and to provide effective emergency response services and to safeguard the quality of the marine environment.

The Irish Coast Guard has responsibility for Ireland's system of marine communications, surveillance and emergency management in Ireland's Exclusive Economic Zone (EEZ) and certain inland waterways.

It is responsible for the response to, and co-ordination of, maritime accidents which require search and rescue and counter-pollution and ship casualty operations. It also has responsibility for vessel traffic monitoring.

Operations in respect of maritime security, illegal drug trafficking, illegal migration and fisheries enforcement are co-ordinated by other bodies within the Irish Government.

On average, each year, the Irish Coast Guard is expected to:

  • handle 3,000 marine emergencies
  • assist 4,500 people and save about 200 lives
  • task Coast Guard helicopters on missions

The Coast Guard has been around in some form in Ireland since 1908.

Coast Guard helicopters

The Irish Coast Guard has contracted five medium-lift Sikorsky Search and Rescue helicopters deployed at bases in Dublin, Waterford, Shannon and Sligo.

The helicopters are designated wheels up from initial notification in 15 minutes during daylight hours and 45 minutes at night. One aircraft is fitted and its crew trained for under slung cargo operations up to 3000kgs and is available on short notice based at Waterford.

These aircraft respond to emergencies at sea, inland waterways, offshore islands and mountains of Ireland (32 counties).

They can also be used for assistance in flooding, major inland emergencies, intra-hospital transfers, pollution, and aerial surveillance during daylight hours, lifting and passenger operations and other operations as authorised by the Coast Guard within appropriate regulations.

Irish Coastguard FAQs

The Irish Coast Guard provides nationwide maritime emergency response, while also promoting safety and security standards. It aims to prevent the loss of life at sea, on inland waters, on mountains and in caves; and to safeguard the quality of the marine environment.

The main role of the Irish Coast Guard is to rescue people from danger at sea or on land, to organise immediate medical transport and to assist boats and ships within the country's jurisdiction. It has three marine rescue centres in Dublin, Malin Head, Co Donegal, and Valentia Island, Co Kerry. The Dublin National Maritime Operations centre provides marine search and rescue responses and coordinates the response to marine casualty incidents with the Irish exclusive economic zone (EEZ).

Yes, effectively, it is the fourth "blue light" service. The Marine Rescue Sub-Centre (MRSC) Valentia is the contact point for the coastal area between Ballycotton, Co Cork and Clifden, Co Galway. At the same time, the MRSC Malin Head covers the area between Clifden and Lough Foyle. Marine Rescue Co-ordination Centre (MRCC) Dublin covers Carlingford Lough, Co Louth to Ballycotton, Co Cork. Each MRCC/MRSC also broadcasts maritime safety information on VHF and MF radio, including navigational and gale warnings, shipping forecasts, local inshore forecasts, strong wind warnings and small craft warnings.

The Irish Coast Guard handles about 3,000 marine emergencies annually, and assists 4,500 people - saving an estimated 200 lives, according to the Department of Transport. In 2016, Irish Coast Guard helicopters completed 1,000 missions in a single year for the first time.

Yes, Irish Coast Guard helicopters evacuate medical patients from offshore islands to hospital on average about 100 times a year. In September 2017, the Department of Health announced that search and rescue pilots who work 24-hour duties would not be expected to perform any inter-hospital patient transfers. The Air Corps flies the Emergency Aeromedical Service, established in 2012 and using an AW139 twin-engine helicopter. Known by its call sign "Air Corps 112", it airlifted its 3,000th patient in autumn 2020.

The Irish Coast Guard works closely with the British Maritime and Coastguard Agency, which is responsible for the Northern Irish coast.

The Irish Coast Guard is a State-funded service, with both paid management personnel and volunteers, and is under the auspices of the Department of Transport, Tourism and Sport. It is allocated approximately 74 million euro annually in funding, some 85 per cent of which pays for a helicopter contract that costs 60 million euro annually. The overall funding figure is "variable", an Oireachtas committee was told in 2019. Other significant expenditure items include volunteer training exercises, equipment, maintenance, renewal, and information technology.

The Irish Coast Guard has four search and rescue helicopter bases at Dublin, Waterford, Shannon and Sligo, run on a contract worth 50 million euro annually with an additional 10 million euro in costs by CHC Ireland. It provides five medium-lift Sikorsky S-92 helicopters and trained crew. The 44 Irish Coast Guard coastal units with 1,000 volunteers are classed as onshore search units, with 23 of the 44 units having rigid inflatable boats (RIBs) and 17 units having cliff rescue capability. The Irish Coast Guard has 60 buildings in total around the coast, and units have search vehicles fitted with blue lights, all-terrain vehicles or quads, first aid equipment, generators and area lighting, search equipment, marine radios, pyrotechnics and appropriate personal protective equipment (PPE). The Royal National Lifeboat Institution (RNLI) and Community Rescue Boats Ireland also provide lifeboats and crews to assist in search and rescue. The Irish Coast Guard works closely with the Garda Siochána, National Ambulance Service, Naval Service and Air Corps, Civil Defence, while fishing vessels, ships and other craft at sea offer assistance in search operations.

The helicopters are designated as airborne from initial notification in 15 minutes during daylight hours, and 45 minutes at night. The aircraft respond to emergencies at sea, on inland waterways, offshore islands and mountains and cover the 32 counties. They can also assist in flooding, major inland emergencies, intra-hospital transfers, pollution, and can transport offshore firefighters and ambulance teams. The Irish Coast Guard volunteers units are expected to achieve a 90 per cent response time of departing from the station house in ten minutes from notification during daylight and 20 minutes at night. They are also expected to achieve a 90 per cent response time to the scene of the incident in less than 60 minutes from notification by day and 75 minutes at night, subject to geographical limitations.

Units are managed by an officer-in-charge (three stripes on the uniform) and a deputy officer in charge (two stripes). Each team is trained in search skills, first aid, setting up helicopter landing sites and a range of maritime skills, while certain units are also trained in cliff rescue.

Volunteers receive an allowance for time spent on exercises and call-outs. What is the difference between the Irish Coast Guard and the RNLI? The RNLI is a registered charity which has been saving lives at sea since 1824, and runs a 24/7 volunteer lifeboat service around the British and Irish coasts. It is a declared asset of the British Maritime and Coast Guard Agency and the Irish Coast Guard. Community Rescue Boats Ireland is a community rescue network of volunteers under the auspices of Water Safety Ireland.

No, it does not charge for rescue and nor do the RNLI or Community Rescue Boats Ireland.

The marine rescue centres maintain 19 VHF voice and DSC radio sites around the Irish coastline and a digital paging system. There are two VHF repeater test sites, four MF radio sites and two NAVTEX transmitter sites. Does Ireland have a national search and rescue plan? The first national search and rescue plan was published in July, 2019. It establishes the national framework for the overall development, deployment and improvement of search and rescue services within the Irish Search and Rescue Region and to meet domestic and international commitments. The purpose of the national search and rescue plan is to promote a planned and nationally coordinated search and rescue response to persons in distress at sea, in the air or on land.

Yes, the Irish Coast Guard is responsible for responding to spills of oil and other hazardous substances with the Irish pollution responsibility zone, along with providing an effective response to marine casualties and monitoring or intervening in marine salvage operations. It provides and maintains a 24-hour marine pollution notification at the three marine rescue centres. It coordinates exercises and tests of national and local pollution response plans.

The first Irish Coast Guard volunteer to die on duty was Caitriona Lucas, a highly trained member of the Doolin Coast Guard unit, while assisting in a search for a missing man by the Kilkee unit in September 2016. Six months later, four Irish Coast Guard helicopter crew – Dara Fitzpatrick, Mark Duffy, Paul Ormsby and Ciarán Smith -died when their Sikorsky S-92 struck Blackrock island off the Mayo coast on March 14, 2017. The Dublin-based Rescue 116 crew were providing "top cover" or communications for a medical emergency off the west coast and had been approaching Blacksod to refuel. Up until the five fatalities, the Irish Coast Guard recorded that more than a million "man hours" had been spent on more than 30,000 rescue missions since 1991.

Several investigations were initiated into each incident. The Marine Casualty Investigation Board was critical of the Irish Coast Guard in its final report into the death of Caitriona Lucas, while a separate Health and Safety Authority investigation has been completed, but not published. The Air Accident Investigation Unit final report into the Rescue 116 helicopter crash has not yet been published.

The Irish Coast Guard in its present form dates back to 1991, when the Irish Marine Emergency Service was formed after a campaign initiated by Dr Joan McGinley to improve air/sea rescue services on the west Irish coast. Before Irish independence, the British Admiralty was responsible for a Coast Guard (formerly the Water Guard or Preventative Boat Service) dating back to 1809. The West Coast Search and Rescue Action Committee was initiated with a public meeting in Killybegs, Co Donegal, in 1988 and the group was so effective that a Government report was commissioned, which recommended setting up a new division of the Department of the Marine to run the Marine Rescue Co-Ordination Centre (MRCC), then based at Shannon, along with the existing coast radio service, and coast and cliff rescue. A medium-range helicopter base was established at Shannon within two years. Initially, the base was served by the Air Corps.

The first director of what was then IMES was Capt Liam Kirwan, who had spent 20 years at sea and latterly worked with the Marine Survey Office. Capt Kirwan transformed a poorly funded voluntary coast and cliff rescue service into a trained network of cliff and sea rescue units – largely voluntary, but with paid management. The MRCC was relocated from Shannon to an IMES headquarters at the then Department of the Marine (now Department of Transport) in Leeson Lane, Dublin. The coast radio stations at Valentia, Co Kerry, and Malin Head, Co Donegal, became marine rescue-sub-centres.

The current director is Chris Reynolds, who has been in place since August 2007 and was formerly with the Naval Service. He has been seconded to the head of mission with the EUCAP Somalia - which has a mandate to enhance Somalia's maritime civilian law enforcement capacity – since January 2019.

  • Achill, Co. Mayo
  • Ardmore, Co. Waterford
  • Arklow, Co. Wicklow
  • Ballybunion, Co. Kerry
  • Ballycotton, Co. Cork
  • Ballyglass, Co. Mayo
  • Bonmahon, Co. Waterford
  • Bunbeg, Co. Donegal
  • Carnsore, Co. Wexford
  • Castlefreake, Co. Cork
  • Castletownbere, Co. Cork
  • Cleggan, Co. Galway
  • Clogherhead, Co. Louth
  • Costelloe Bay, Co. Galway
  • Courtown, Co. Wexford
  • Crosshaven, Co. Cork
  • Curracloe, Co. Wexford
  • Dingle, Co. Kerry
  • Doolin, Co. Clare
  • Drogheda, Co. Louth
  • Dun Laoghaire, Co. Dublin
  • Dunmore East, Co. Waterford
  • Fethard, Co. Wexford
  • Glandore, Co. Cork
  • Glenderry, Co. Kerry
  • Goleen, Co. Cork
  • Greencastle, Co. Donegal
  • Greenore, Co. Louth
  • Greystones, Co. Wicklow
  • Guileen, Co. Cork
  • Howth, Co. Dublin
  • Kilkee, Co. Clare
  • Killala, Co. Mayo
  • Killybegs, Co. Donegal
  • Kilmore Quay, Co. Wexford
  • Knightstown, Co. Kerry
  • Mulroy, Co. Donegal
  • North Aran, Co. Galway
  • Old Head Of Kinsale, Co. Cork
  • Oysterhaven, Co. Cork
  • Rosslare, Co. Wexford
  • Seven Heads, Co. Cork
  • Skerries, Co. Dublin Summercove, Co. Cork
  • Toe Head, Co. Cork
  • Tory Island, Co. Donegal
  • Tramore, Co. Waterford
  • Waterville, Co. Kerry
  • Westport, Co. Mayo
  • Wicklow
  • Youghal, Co. Cork

Sources: Department of Transport © Afloat 2020