Some links of interest:

Address Description
Angling Charts Angling charts for Lough Corrib and other fishing lakes
Athlone IWAI Athlone IWAI
Athlone Sub-Aqua Athlone Sub Aqua Club
Barge Hawthorn The Hawthorn Blog, Irish travels, sketches and recipes
Carrick-on-Shannon IWAI Carrick-on-Shannon Branch – IWAI
Clonmacnoise Bridge Archaeological excavations of medieval bridge
Down Survey Down Survey of Ireland 1656 to 1658 – first detailed land survey in the world
Dublin IWAI Dublin IWAI
IWAI Inland Waterways Association of Ireland
Irish Waterways History Forgotten navigations, scenery, boats, waterways operations, past & present
Kildare IWAI Kildare IWAI
Lough Derg IWAI Lough Derg IWAI
NMS – underwater archaeology National Monuments Service – underwater archaeology unit
Offaly IWAI Offaly IWAI
Ordnance Survey Ireland Ordnance Survey Ireland , reference material on positioning ITM etc
Reelaxing Surveying on Lough Ree and throwing the odd line out
Underwater Ireland Photos and videos of Irish rivers and lakes, just below the surface
UU – maritime archaeology University of Ulster – maritime archaeology unit
Memory Map UK Memory Map software
Open CPN Chartplotter and GPS Navigation Software