Geographical mile longitude at the equator is thus exactly 60 geographical miles. It was closely related to the nautical mile, which was originally determined as 1 minute of arc along a great circle of the Earth, but is nowadays defined as exactly 1852 metres. The US National Institute of Standards and Technology (NIST) notes that: "The international nautical mile of 1 852 meters (6 076.115 49...feet) was adopted effective July 1, 1954, for use in the United States. The value formerly used in the United States was 6 080.20 feet = 1 nautical (geographical or sea) mile." (6080.2 feet is 1853.24496 meters.)
USS Wissahickon (SP-852) at East Boston, Massachusetts, for the rest of World War I and into January 1919. Apparently sometime between September and November 1918, and definitely by 1 January 1919, her name was changed from USS "SP-852" to USS "Wissahickon" (SP-852). Late in January 1919, "Wissahickon" moved to Camden, Maine. She was stricken from the Navy List on 10 February 1919 and was decommissioned at Camden on 12 February 1919. On 15 February 1919, she was ordered returned to Mrs. Henry. USS Wissahickon (SP-852) The second USS "Wissahickon" (SP-852), which also served as USS "SP-852", was a United States Navy patrol vessel