(16 July 2026): The Commissioners of Irish Lights recently welcomed Minister Timmy Dooley, Minister of State at the Department of Agriculture, Food and the Marine and at the Department of Climate, Energy and the Environment aboard the ILV Granuaile as the vessel carried out its annual maintenance of marine aids to navigation on the Shannon Estuary in support of maritime safety. On the visit, Minister Dooley commented on the importance of the work underway, stating: 

“Having visited the ILV Granuaile earlier this week, I saw first‑hand how Irish Lights delivers on its core mission of safe navigation for all. The work being carried out on the Shannon Estuary shows the importance of maintaining a resilient and technically advanced Aids to Navigation service — one that protects lives at sea, supports the flow of trade and economic activity, and safeguards our marine environment. The professionalism and expertise of the Irish Lights teams, both offshore and onshore, are central to keeping vessels moving safely through some of Ireland’s most challenging waters.”  

Minister Dooley was met by Captain Mike Murphy and Irish Lights CEO Yvonne Shields O’Connor, who provided a comprehensive briefing on the ship’s specialist capabilities and the essential safety of navigation work underway along one of Ireland’s most strategically important maritime corridors. He met with the vessel’s officers and crew, gaining insight into the Granuaile’s role as a multi-function buoy tender vessel, including heavy‑lift buoy operations, emergency wreck marking, and its support to national search and rescue and MetOcean monitoring services.  

The Shannon Estuary is a national logistics artery, supporting over 20% of the fuel and raw materials used in Ireland’s electricity generation and providing a deepwater route for essential agricultural and energy imports. Its extreme tidal range, reaching up to 5.5 metres at Limerick Docks, produces powerful 4–5 knot currents and creates significant localised hazards for commercial vessels navigating the channel.  Irish Lights maintains the statutory Aids to Navigation that ensure safe access to this gateway, including the buoyage system marking the narrow deepwater channel and the leading lights at Corlis Point, which guide vessels through shallow and shifting hazards at the Estuary entrance.  

Speaking during the visit, Yvonne Shields O’Connor, CEO of Irish Lights, said: “The Shannon Estuary is an important operating environment, and maintaining a reliable Aids to Navigation service here requires detailed planning and close coordination across our marine and shore-based teams. We were delighted to welcome Minister Dooley aboard and to showcase the expertise that underpins safe navigation around Ireland’s coast.” 

 Minister Dooley was briefed on the intensive buoy maintenance programme carried out every year around our coasts by Irish Lights crews aboard the ILV Granuaile.  

The operation involves a full cycle of heavy‑lift, engineering, and digital navigation upgrades. Using the ILV Granuaile’s specialist marine cranes, crews hoist, multi‑tonne steel and plastic buoys completely out of the water for inspection and servicing. Once on deck, specialised crew remove dense marine growth, examine mooring chains for signs of deterioration, and carry out structural repairs caused by winter Atlantic conditions. The deck team then install ultra‑bright, synchronised LED lanterns and replace the heavy‑duty batteries that power each buoy’s light and electronic systems. The team also calibrates the buoys’ Automatic Identification System (AIS) transmitters and Radar Beacon (Racon) units, ensuring that higher risk Aids to Navigation remain visible on the ship’s radar and Electronic Chart Display & Information System (ECDIS) to assist conspicuity and situational awareness in all weather and visibility conditions.   

The Minister also received a briefing on Irish Lights’ offshore operations, including upcoming maintenance on the K4 and K5 North Atlantic weather buoys. Operated by the UK Met Office (K‑series) and the Marine Institute (M‑series), these buoys provide real‑time ocean‑atmosphere data used by Met Éireann and the UK Met Office to forecast storms, gale warnings, and severe wave conditions.

The ILV Granuaile will service these buoys at distances of 90 to 290 nautical miles offshore, in waters exceeding 1,000 metres deep demonstrating Ireland’s capacity to maintain critical international weather and safety infrastructure.