Charts. Yokosuka, Japan. Yokosuka naval base, including Negishi Wan and Uraga Kō, Tokyo Kaiwan, Honshu, south coast, Japan, from Japanese surveys in 1938 and 1939, with additions to 1942; provisional H. O. no. 6352. Scale naut. m.=6.3 in., natural scale 1:23,000. n. p.