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23 Oct 2025
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23 Oct 2025
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In 1825, Thomas Drummond ascended Sliabh Sneacht with a team for a two-week camp which helped shape Ireland’s first accurate national maps
A breakthrough that helped shape Ireland’s first accurate national maps which took place in Inishowen 200 years ago is being marked with a special event.
On October 27, 1825, Royal Engineer Thomas Drummond of the Ordnance Survey ascended Sliabh Sneacht with a team for a two-week camp and used a pioneering limelight device to beam a signal 67 miles to Belfast.
This remarkable achievement marked a new era in Irish mapping and surveying.
As part of National Heritage Week, the bicentenary of this landmark moment in Irish mapping history is being marked.
READ NEXT: Colgan Heritage Weekend to showcase one hundred years of local and Irish history
An event titled, A Light Across the Land – Celebrating 200 Years of Mapping Innovation, is taking place on Friday, August 22 in the Sliabh Sneacht Centre in Drumfries.
The event includes a guided walk at 3pm which explores the new Drovers Trail, also known as the Old Carn Road, with a trained Lowland Leader from Active Inishowen, supported by North West Community Development Partnership.
After refreshments at 4:30pm, Dr Peter Wilson will give a talk on Drummond’s legacy and the evolution of Irish cartography.
Booking for each event is required. To book your place or find out more, contact: kevin@inishowen.ie.
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