by W.J. Henderson, A.M.
A short and complete explanation of the standard methods of finding the position of a ship at sea and the course to be steered.
A no-nonsense little navigation text (you can never have too many of these)! Complete and succinct, Henderson sets the tone in the first paragraph of the first chapter. "The reader of this book is cautioned that no words are wasted in it. Facts are stated once and not repeated. Explanations are given but once. The student must master each fact, each explanation, and each process before proceeding to the next. . . .It is presumed that the student knows what latitude and longitude are, and that he can add, subtract, multiply and divide degrees, minutes and seconds, and hours, minutes and seconds, and can work with decimal fractions." So there! (The reader can however by excused from studying the chapter on Mine Fields in the short Wartime Problems chapter.) This was, after all, first published in 1817.
CONTENTS: INTRODUCTION, VARIATION, DEVIATION, HOW TO FIND THE DEVIATION, LEEWAY, THE LOG, THE LEAD-LINE, CHARTS, CHART SAILING, DEAD-RECKONING, EXAMPLES FOR PRACTICE, WORKiNG A TRAVERSE, HOVE TO, SHAPING THE COURSE, NAVIGATION BY OBSERVATION, ADJUSTMENTS, INDEX ERROR, HINTS ON TAKING ALTITITDE, CORRECTING THE ALTITUDE, THE CHRONOMETER. THE NAUTICAL ALMANAC, APPARENT AND MEAN TIME—THE EQUATION, LATITUDE BY MERIDIAN ALTITUDE, LATITUDE BY MERIDIAN ALTITUDE OF A STAR, LATITUDE BY MERIDIAN ALTITUDE OF A PLANET, LATITUDE BY MERIDIAN ALTITUDE OF THE MOON, MERIDIAN ALTITUDE BELOW THE POLE, USE OF CONSTANT, LATITUDE BY EX-MERIDIAN ALTITUDE OF THE SUN, "PHIPRIME” SIGHT , lATITUDE BY THE POLESTAR, COMPASS ERROR BY AZIMUTHS, RELATIONS OF RIGHT ASCENSION AND HOURANGLE, LONGITUDE BY CHRONOMETER (OR TIME) SIGHT, REMARKS ON LONGITUDE, LONGITUDE BY SUNRISE AND SUNSET SIGHTS, CHRONOMETER SIGHT OR A STAR, SUMNER’S METHOD, EXAMPLE OF SUMNER’S METHOD WITH TIlE SUN, EXAMPLE OF SUMNER LINES WITH TWO STARS, ST. HILAIRE METHOD, GREAT-CIRCLE SAILING, DISTANCE AND DANGER-ANGLES, ALLOWANCE FOR TIDES, KEEPING THE LOG, RATING A CHRONOMETER, CARE OF A CHRONOMETER, THE NAVIGATOR’S ROUTINE, EXAMPLES FOR PRACTICE: DEAD-RECKONING; SHAPING COURSE BY MERCATOR’S SAILING; LATITUDE BY MERIDIAN ALTITUDE OF SUN; LATITUDE BY MERIDIAN ALTITUDE OF STAR; LATITUDE BY MERIDIAN ALTITUDE BELOW THE POLE; LATITUDE BY EX-MERIDIAN ALTITUDES ; LATITUDE BY THE POLESTAR; LONGITUDE BY CHRONOMETER SIGHT, WAR-TIME PROBLEMS, THE NAVAL COAST-DEFENSE RESERVE .
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