The above co-ordinates are not for the cache, they are for the Normandy village hall car park, where you might begin your search. The sundial is not too far from here. Its a short walk (certainly less than half a mile away).
If you were deciding upon a place to put a sundial then a large sunny open space like this would be a good choice.
This sundial however is in a shady spot overhung with trees. A poor location you might think, but this is an invisible sundial which has never had a gnomon.
You must find the sundial. It has a plaque with the dates 19AB-19CD, and fortunately this plaque is visible.
Now a few calculations:
E = Edwards initial (convert it to a number using the usual method)
F = B + C + E - D
G = (C*D) + B - A
H = A + B + C + E
X = (B*C*E) - (D*H)
Y = (F*G) - (A*H)
The cache is at:
You probably won't need it but you can check your answers for this puzzle on GeoChecker.com.
The cache is a small camo container. It doesn't contain a pen so bring your own.
Good luck and have fun. Please do not leave any spoilers in your log.
I've rated the terrain as 1.5 but the sundial can easily be reached by wheelchair (even on a wet day). The cache is slightly inaccessible which is why I decided upon 1.5.
The sundial isn't on private property and can be found 24/7.
My puzzle cache "On 21st July" (GC1W4MY) contains a hint for this one.