CACHING IS NOT WITHOUT ITS DANGERS
This is a puzzle cache and there is no benefit in visiting the listed coordinates but to be fair it is close by. I'll give you a start N54 05.XXX W6 41.XXX.
The cache is a small container, camo'd and well secured in place. I'm sure you can Picture it already.
You could try searching the Length and Breath of the Lough but its easier to solve the puzzle. If you Size it up correctly you'll find the right answer.
While I prefer traditionals myself but I thought I would add another Dimension by making this a puzzle. I realise the puzzle caches are not everyone's cup of team but please keep things in Proportion. I've had 5 containers vanish between the 2 caches closest to the slipway and the addition of a puzzle is designed to prevent casual vandalism. I intend my caches to be found so if you need help please contact me after the FTF is gone.
There is a spoiler image and hints in the geochecker.