Pearce Island in Pearce Point Harbour,NWT
July 1962 Adjacent to Pin A (a DEWLine site 50 miles east of Cape Parry) 69°48′55″N 122°43′02″W - (not the one at Gaspe, Quebec!) https://canadac3.ca/en/expedition/the-places/pearce-pt https://en.wikipedia.org/wiki/Percé_Rock