What a lovely cairn this is and what a lovely view of Campstone Hill and its various Raedykes cairns. Wonderful setting.
I parked at the Lang Stane and walked northwards (pun intended), thru the gate and up the hill. Take the track that veers north east towards Southward and skirts past to the north. Keep going past the ruins of another Southward and basically walk in a straight line which should lead straight to the cairn, near the tree line. Now this is what you should do, I found an alternate route via bogs and burns to the south and found this track on the way back.
Canmore says 4 kerbs but I counted 7 in the 13m wide cairn. Whatever it is this is a beautiful place.
The road back to Lang Stane also involves walking on the ancient trackway, Elsick Mounth. Its also good to see that Thelonius seems to find awkward routes to places as well :-)
Visited 5/1/2017.