Spar's primary mission is to maintain aids to navigation. In 2007, her area of responsibility extended from Kodiak in the east to Attu in the western Aleutians and north into the Bering Sea, including the Pribilof Islands.
The primary goal of Spar is to maintain navigational tools. By 2007, its area of authority had been broadened from Kodiak on the eastern side to Attu on the western Aleutians and up into the Bering Sea, including the Pribilof Islands.