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
RNLI RNLI – UK and ROI
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