Lt. Thomas Dempsey uses an alidade aboard the submarine tender USS Frank Cable (AS 40) to track bearings as the ship departs from Apra Harbor. Frank Cable, forward deployed to the island of Guam, conducts maintenance and support of submarines and surface vessels deployed to the U.S. 7th Fleet area of responsibility and is on a scheduled underway period. (U.S. Navy photo by Mass Communication Specialist 2nd Class Zac Shea/Released)