We can resolve this quite quickly, I believe.
Forget about CARN. Forget about GPSs and all the other modern toys we use.
Can someone who remembers the old fashioned ways just look up the Inventory for a ring cairn in the area which looks like this
http://www.themodernantiquarian.com/post/25505
and tell us
(1) what it's called and
(2) what's its 6-figure grid ref in the Inventory
We then use that info to create another site.
There may be some tidying up to do thereafter but we'll be cooking by then.