ok, a little more to the north is new brodgar (kind of a ghost town now, or so it seems) so we are at grid D3. Just shared so anyone else can get orientated
the map is 7x7 now, right? Its a long way to go still...
The map is 9x9 supergrids. And you should stop using that notation for supergrids because what people formerly called "A1" is no longer the top-left corner grid.