The Carlingford to Omeath Pathway has been talked about for the past two years in the Cooley Penisula. Recently signs that it would be ready soon began appearing.
Glimpses from the road and Greer's Quay showed the path appearing on the old Dundalk to Newry railway line.
I finally figured out where it begins, by the Yacht Club on the photo above,  there's a green fence that skirts the boatyard, as the entrance.