At the small village of Muir Of Fowlis on the A980, area covered in ancient sites, take the minor road east signposted Tough (RSC nearby which I've yet to visit)
The cairn is situated on the northern side of the road after the track to Guise Farm (the second track north) and can be identified by the group of trees on the skyline. A fairly steepish climb awaits to the well kept if added to cairn.
It stands some 20 meters wide, at least 2 meters tall. Mostly turf covered some cairn material pokes thru. Field clearance has been added to the northern side. With that it was back down the hill only to climb it again. I'd forgotten the fotie machine!