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DEPARTMENT OF COMMERCE,
Washington, November 1, 1927. This publication covers the coasts of Luzon, Mindoro, and the Visayan Islands with the adjacent islands and waters. It is based mainly upon the work of the United States Coast and Geodetic Survey. The waters north and northeast of Luzon have not yet been surveyed, and the notes relating to those waters have been compiled from a variety of sources, principally from the Spanish Derrotero and from reconnaissances by United States and Philippine Islands Government vessels.
This volume covers the area formerly included in Sections I to IV, Philippine Islands Sailing Directions, compiled by John Dow, nautical expert in the Manila field station of the United States Coast and Geodetic Survey, and it consists of a rearrangement and revision of the fourth edition of that publication, together with a large amount of new information gathered by the various field officers of the survey. The present second edition has been prepared in the office of the United States Coast and Geodetic Survey at Manila by R. J. Christman, chief of chart division, under the supervision of R. B. Derickson, hydrographic and geodetic engineer, United States Coast and Geodetic Survey, director of coast surveys.
Great courtesy has been shown by the United States Army, the Nayy, the several Philippine government bureaus, local authorities, and navigators in the islands in furnishing information for use in this publication. The aids to navigation are corrected to June 30, 1927.
Navigators are requested to notify the director of coast surveys, Manila, P. I, of any errors or omissions they may find in this publication or of accitional matter which they think should be inserted for the information of mariners.
E. LESTER JONES, Director.
The courses and bearings given in degrees are true, reading clockwise from 0° at north to 359°, and are followed by the equivalent magnetic value in points in parentheses. General directions, such as northeastward, west-southwestward, etc., and all courses given in points, are magnetic.
Distances are in nautical miles and may be converted approximately to statute miles by adding 15 per cent to the distances given.
Currents are expressed in knots, which are nautical miles per hour.
All depths, except where otherwise stated, are at mean lower low water. In accordance with the desire of the International Hydrographic Conference, the equivalent expressed in meters follows in parentheses.
Heights are given in feet, followed by the metric equivalent in parentheses.
Changes and other corrections affecting Coast Pilot volumes are included in the Notice to Mariners published weekly by the United States Department of Commerce. Changes and corrections affecting Philippine charts and coast pilots are published quarterly in Manila Notice to Mariners. About one year after a Coast Pilot is published, and at approximately yearly intervals thereafter until a new edition is brought out, a supplement, giving the more important corrections and additions to its text since the date of its publication, is issued. The date of the latest supplement to each Coast Pilot, for which a supplement has been issued, is shown in the list of Coast Pilots published each week in the Notice to Mariners. Any supplement may be obtained, free of charge, upon application to the Coast and Geodetic Survey, Washington, D. C., or any of its field stations. Each supplement is complete in itself and cancels all previous supplements.
Do not use this Coast Pilot except with reference to the latesti supplement that may have been published and Notices to Mariners issued after the date of the supplement.