Cache is NOT at the posted co-ordinates.
This is a bonus cache for the Limerick Tourist Trail Adventure Lab cache.
At each of the five stages you will have received a four letter word. Put them in alphabetical order and then enter it as one long string into the checker.
So if the five words were BIRD SWAN CAKE BATH PEAR then you would enter BATHBIRDCAKEPEARSWAN into the geochecker.
You can validate your puzzle solution with certitude.