Scale circa 1:25,000 Bound in 1906 Guam - Bonin cable folder. Chart No 10. Black and white chart. Mss cable routes marked in blue and red. Soundings in fathoms. Bar scale. Mss note 'The soundings shown on this chart in blue are taken from charts lent by the Commercial Pacific Cable Co' . Soundings shown in red were taken during the Guam-Bonin cable expedition. 1906'. Text 'Siemens Brothers & Co Ltd London, SS "Urmston Grange" May 1906, W. Dieselhony, 14/6/06'. From the Japanese Naval Chart No 83. (Position of cables as plotted on cable cos chart).