Over 83 Eire signs were constructed around the coast in the summer of 1943 during WW2
EIRE 6 Restoration Project: Key documents
Environmental Impact Statement
2. Ministerial Consent with NPWS conditions to proceed
3. Award of Heritage Council grant
Allied aircraft were still prohibited from overflying neutral Irish territory, apart from the “Donegal Corridor”. But the numbered “EIRE” signs were soon marked on Allied navigational maps, assisting aircraft to accurately and safely navigate Ireland’s Atlantic and Irish Sea coasts without infringing Irish territory. The role the EIRE signs played assisting Allied aircrew navigate safely was later acknowledged by Allied forces, who thanked the Irish government for the assistance this had provided.