The Canmore record has a spot of folklore about this 9’10” stone from the Name Book of 1878: “It is said to mark the spot where the son of the Viking Harold Harfager was killed some time around 900AD. He is said to have been buried in the tumulus to the southwest.” I guess this tumulus must be the chambered cairn you can see on the OS map, which is on the island on the other side of the Skuda Sound.