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NOTICES TO MARINERS
NOS. 1 TO 52 INCLUSIVE
PUBLISHED BY THE HYDROGRAPHIC OFFICE UNDER THE
AUTHORITY OF THE SECRETARY OF THE NAVY
NOTICE TO MARINERS, 1918.
All courses and bearings are true, given in degrees, measured clockwise from 0° to 360°, and, in the case of lights, from seaward. The visibility of lights given is the calculated distance at which they can be seen from a height of 15 feet above the level of the water, when the elevation of the light is taken above mean high tide. The reference numbers of charts to be corrected are indicated in bold-faced type. The only B. A. and C. S. Charts referred to are those issued to United States vessels. Distances are given in feet, yards, or nautical miles; in the section of the Great Lakes distances are in statute miles.
Lights extinguished, Dakar and approaches and Sierra Leone, traffic regulations..