The MacGregor Arctic Expedition was a privately funded expedition which set out to reoccupy Fort Conger, Ellesmere Island, Canada, a site within flying distance of the North Pole. The expedition, which took place from July 1, 1937, to October 3, 1938, had four main objectives: To collect weather data; to make a magnetic survey; to photograph the aurora borealis and study its effects upon radio transmission; and to explore the area northwest of Ellesmere Island, in order to clear up the questions about Crocker Land, which Robert Peary placed on the map more than 30 years earlier.