Charts. Takao Ko, Taiwan (Formosa), west coast, Japan, from Japanese survey in 1918, scale 2000 yds.=5.9 in., natural scale 1:12,110; Toapanraa Byochi, Nan Wan, Taiwan (Formosa), south coast, Japan, from Japanese survey in 1906. scale naut. m.=2.6 in., natural scale 1:28,571; chart 2488.