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Practical Navigation for Second Mates


Year: 2001
Language: english
Author: A. FROST
Genre: Practical guide
Publisher: BROWN, SON & FERGUSON LTD. NAUTICAL
Edition: 5th edition
ISBN: 0 85714 3978
Format: PDF
Quality: eBook
Pages count: 202
Description: In this revision 'Practical Navigation for Second Mates' has been extended to include chartwork and tidal calculations. The intention in doing this was to provide a text for candidates preparing for the chartwork and practical navigation of the Department of Trade Class V and Class IV certificates. Worked examples of all problems and calculations encountered in these papers together with ample exercises for self examination, are included, and specimen papers similar to Class V 'Chartwork and Practical Navigation', Class IV 'Chartwork', and Class IV 'Practical Navigation' are provided.
All practical navigation problems and tidal calculations used may be worked with the extracts from the Nautical Almanac, and the extracts from the Admiralty Tide Tables included. Chartwork exercises however, inevitably require the use of a chart. Such exercises have been set on Admiralty charts 1179, 5050 or 5051, as these particular charts are published as inexpensive instructional charts, which, although not suitable for navigation, are full size and authentic and entirely adequate for practice purposes.

Contents

Introduction Section 1
CONTENTS
CHAPTER l-THE MEASUREMENT OF POSTION AND DISTANCE ON THE EARTH'S SURFACE
Latitude and longitude. Difference of latitude, difference of longitude. The sea mile. The nautical mile.
CHAPTER 2-THE MEASUREMENT OF DIRECTION. THE EFFECT OF WIND AND TIDE.
The three figure notation. The gyro compass. The magnetic compass. Variation and deviation. Compass error. The three norths. Relative bearing. The deviation table and its use. The effect of tide. Course made good. Counteracting the tide. To reach a position in a required time while counteracting a tide. To find the set and drift between two observed positions.
To find the course to steer to pick up a point of land at a required angle on the bow.
The effect of wind. Leeway . Counteracting the leeway.
CHAPTER 3-POSITION LINES
The position line defined. Great circle. bearings. Mercator bearings. The half convergency correction.
The position circle. Vertical sextant angles. Horizontal sextant angles. Rising and dipping distances:-Ranges of lights.
The transit bearing. Danger angles.
the hyperbolic position line.
CHAPTER 4-THE SAILINGS.
Parallel sailing. Plane sailing. The middle latitude. Mercator sailing.
CHAPTER 5-THE TRAVERSE TABLE. THE TRANSFERRED POSITION LINE.
The traverse table and its use. Running up the D. R. position. Transferring the position line. The running fix.
The running fix with tide.
Transferring the position circle.
Transferring the position line by traverse table.
Doubling the angle on the bow.
CHAPTER 6-- TIDES AND TIDAL STREAMS.
Tidal streams and currents. Tidal stream information on Admiralty charts. Tidal stream atlases. Tides. Prediction of tidal times and heights.
To find the times and heights of high and low waters at a standard port. To find the height of tide at times between high and low water at a standard port. To find the time at which there will be a given depth of water at a standard port. Secondary ports. To find the times and heights of high and low water at a secondary port. To find the height of tide at times between high and low water at a secondary port. To find the time when there will be a given depth of water at a secondary port. Drying heights. Heights of terrestrial objects.
CHAPTER 7-THE CELESTIAL SPHERE AND THE NAUTICAL ALMANAC.
The celestial sphere. Definition of position on the celestial sphere. The geographical position. Definition of a celestial bodies G.P. on the terrestrial sphere.
The Nautical Almanac. To extract the declination and GHA. To find the times of meridian passage. To find the times of sunrise and sunset, and moonrise and moonset.
CHAPTER 8-COMPASS ERROR BY ASTRONOMICAL OBSERVATION.
The azimuth problem and the amplitude problem.
Specimen papers for Class V chartwork and practical navigation, and for Class IV chartwork.
Section 2
CHAPTER 9-POSTION CIRCLES AND POSTION LINES. The Marcq St. Hilaire method.
Plotting of position lines. To plot the position from two simultaneous position lines by Marcq St. Hilaire. To plot the position from two position lines by Marcq St. Hilaire with a run between.
The Longitude by Chronometer method. To plot the position from two simultaneous position lines by longitude by chronometer.
To plot the position from two position lines by longitude by chronometer with a run between.
Position line by meridian altitude observation. Plotting the noon position from a forenoon observation and meridian observation.
Plotting the position by celestial observation combined with a terrestrial observation.
CHAPTER 10---CORRECTION OF ALTITUDES.
The individual corrections. Correction of altitudes by individual corrections. Total correction tables. Correction of altitudes by total correction.
CHAPTER 11-LATITUDE BY MERIDIAN ALTITUDE.
Calculation of the latitude by observation of a body on the observer's meridian. To find the altitude to set on a sextant to observe the meridian passage.
Lower meridian passage. Calculation of the latitude by observation of a body on the observer's lower meridian.
CHAPTER 12-CALCULA TION OF POSITION LINES BY OBSERVATION OF BODIES OUT OF THE MERIDIAN.
The PZX triangle. The Marcq St. Hilaire method. Calculation of intercept and bearing. The Longitude by Chronometer method. Noon position by forenoon observation and meridian observation. Use of the 'c' correction to find the noon longitude.
CHAPTER 13- THE EX MERIDIAN PROBLEM.
Calculation of position lines by observation of bodies near the meridian. Ex meridian tables.
CHAPTER 14 THEPOLESTARPROBLEM.
Calculation of the latitude by observation of the pole star.
CHAPTER 15-GREAT CIRCLE SAILING.
Calculation of courses and distance by great circle sailing. Calculation of courses and distance by composite great circle sailing.
Specimen papers in practical navigation for Class IV. Answers to exercises.
Extracts from the Nautical Almanac 1980.
Extracts from the Admiralty Tide Tables 1980.
Index

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