It can't be much more than a hundred yards from fort to cairn, but no one seems to have noticed it before, or passed over it in favour of a more impressive site.
It is a very flat cairn, no hump or bump, no scooped interior, just some kerb stones give it away. Despite it's seemlessly melting into the hill side, I really quite liked it. Great views, great weather, and it looks like the fort mirrors it's meltingintothehillsideyness. (that's my new word, watch the dictionary)