關門海峽
During the Russo-Japanese War, "Yamato" served as a guard ship patrolling the Kanmon Straits between Honshū and Kyūshū off of Shimonoseki. On 28 August 1912, she was reclassified as a second class coastal patrol vessel, and was assigned to coastal survey duties. On 1 April 1922, she was officially re-designated as a survey vessel, and her armament was replaced by two 8-inch guns. During the course of its surveys, "Yamato" discovered a seamount in the Sea of Japan, which was named after it.