A Canadian nautical map charts the Canadian coastline in Nares Straight which separates Ellesmere Island with Greenland. The old Soviet Union may have been just as familiar with Canada's Arctic waters as Canadians. Sections of Cold-War-era nautical charts obtained by The Canadian Press suggest that Russian mariners have for decades possessed detailed and accurate knowledge of crucial internal waterways such as the Northwest Passage. THE CANADIAN PRESS/Michael Byers. THE CANADIAN PRESS/Michael Byers