During the 1960s, "Hudson" performed five surveys of the Mid-Atlantic Ridge as part of the world-wide study of continental drift. The ship took part in Expo '67 and had satellite navigation installed, becoming the first ship outside the United States Navy to have the technology. In 1969, "Hudson" circumnavigated North America. From November 1969 to October 1970, the vessel circumnavigated North and South America, starting in Nova Scotia, travelling south to Antarctic waters, around the southern tip of South America, north through the mid-Pacific and back to Nova Scotia through the Northwest Passage. "Hudson" was the first vessel to circumnavigate both continents. While transiting, the ship carried out several experiments, among them studies of marine life along the east coast of the Americas, tidal current surveys of Chilean fjords and geographic discoveries in the Pacific Ocean. This voyage, in which over 100 scientists participated during various stages, was documented in the 1973 book ""Voyage to the Edge of the World"" by Alan Edmonds .