Vessels in the Lighthouse Service (LHS) were given letter designations to identify individual ships. The first series went from the letters A-Z. The second series went AA-ZZ.
Then the numbering system was changed and ships given the letter-number combination LV-1, LV-2.The Arctic was formerly the U.S. Navy Ship "D" when stationed off Frying Pan Shoals before the war.
After the war, it became LV-8 and was stationed off Hens and Chickens and then off Relief.