The cache is located at another part of the village. To complete the coordinates you must collect some numerical information, and replace the letters.
54 32.ABC
005 29.DEF
A = Donaghadee minus Ballyhalbert
B = Millisle minus Carrowdore
C = 2 times Newtownards divided by Carrowdore
D = Carrowdore minus Millisle
E = Portaferry divided by Millisle
F = Millisle minus Ballyhalbert
You can check your answers for this puzzle on Geochecker.com.
The cache is a magnetic nano so you will need to bring along a pen or pencil
There is ample parking at each location, but is an easy stroll if it is a lovely day, and a stop for an icecream would be nice!