Looking Back on World Lighthouse Day 2025

On August 7th, we mark World Lighthouse Day, a moment to reflect on the legacy, function, and continued relevance of lighthouses along Ireland’s coast.

As Ireland’s national seabed mapping programme, INFOMAR frequently works in the waters surrounding these enduring structures. From the Fastnet to Fanad Head, lighthouses not only represent navigational safety but are also powerful symbols of maritime heritage. Many of our recent surveys have brought INFOMAR vessels within view of these familiar towers, reinforcing the deep connection between hydrographic work and coastal navigation.

Figure 1: Irish Lighthouses as seen from INFOMAR Survey Vessels

We were proud to acknowledge the vital role of the Commissioners of Irish Lights and the Department of Transport, who continue to manage and modernise Ireland’s network of coastal aids to navigation — over 340 in total. Their work ensures the safety of mariners, protects marine infrastructure, and supports growing offshore activity.

Did you know that Hook Lighthouse in Co. Wexford is considered the oldest operational lighthouse in the world? With its origins dating back over 800 years, it stands as a testament to Ireland’s long-standing commitment to safe seas. As we reflect on Lighthouse Day 2025, we extend our thanks to Irish Lights and celebrate the shared mission of protecting those who work and travel at sea.

INFOMAR is Ireland’s national seabed mapping programme, funded by the Department of Climate, Energy and the Environment and jointly managed by Geological Survey Ireland and the Marine Institute. It aims to map Ireland’s seabed and deliver a comprehensive baseline bathymetry dataset to underpin the future management of Ireland’s marine resource.

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