Author: David Burch Publisher: ISBN: 9780914025245 Category : Sports & Recreation Languages : en Pages : 106
Book Description
Sextants are used to measure angular heights of celestial bodies above the horizon to find the latitude and longitude of the observer. They can also be used on land with artificial horizons. Sextants can also be used to find the correct Universal Time by measuring the angular distance between the moon and another body along its path across the zodiac. In coastal waters or on land, sextants can be used for very accurate piloting by measuring the horizontal angles between charted landmarks. The vertical angle of a peak above its baseline determines the distance to it, which, combined with a compass bearing, yields a position fix from just one landmark. The angular dip of an object (island or vessel) below the visible horizon can also be used to determine the distance to it. This booklet explains how to get the best results from plastic sextants, and presents numerical comparisons with similar data from metal sextants. Sextant piloting techniques are also reviewed as they are an ideal use of a plastic sextant.
Author: W. J. Morris Publisher: ISBN: 9780939837892 Category : Reference Languages : en Pages : 246
Book Description
The Nautical Sextant reveals in pictures, prose, and perspective the experience and knowledge gained by the author from years of acquiring, studying, and restoring sextants from earlier times and from around the world. This fascinating book owes much of its attraction to the expert description and photos of the mechanics of the sextants and their subassemblies. It is also the story of how different manufacturers, in different times and places, solved the same mechanical problems in different ways in order to perfect one of the most accurate mechanical devices ever produced by man. All of this is complemented by an historical overview to the current day, an overview which has never been published until now. The Nautical Sextant will be of particular value not only to navigators, but also to restorers, collectors, students of technology, curators, and sextant dealers. With its bibliography and extensive use of footnotes, this book will certainly become a classic in its field.
Author: Peter Ifland Publisher: Krieger Publishing Company ISBN: Category : Science Languages : en Pages : 248
Book Description
This text focuses on the history of the development of hand-held celestial navigation instruments, offering descriptions of the tools used. It also includes a glossary of technical terms.
Author: Mary Blewitt Publisher: A&C Black ISBN: 1472906764 Category : Transportation Languages : en Pages : 104
Book Description
The 12th edition of this bestselling book is proof of the success of Mary Blewitt's concise and clear style in explaining a particularly difficult skill, and it has been the bible for many generations of ocean navigators. Since this book was first published, the huge advances in electronic navigation have transported most offshore navigators to a world of press-button convenience. However, there is still a vital need for traditional skills when things go wrong: batteries can fail, aerials go overboard, and electronics have been known to get wet. A bestseller for over 50 years, Celestial Navigation for Yachtsmen is a model of simplicity and clarity. The worked examples require only straightforward addition and subtraction, which explains why this book has truly earned its reputation for admirable conciseness and for making a tricky subject easy to understand. 'The "bible" of navigation for generations of yachtsmen... worth its weight in gold' Sailing
Author: Dag Pike Publisher: Sheridan House, Inc. ISBN: 9781574091687 Category : Sextant Languages : en Pages : 118
Book Description
The sextant is the treasured navigational device of generations of seamen and airmen. It enables position to be determined with good accuracy for ocean navigation, and it was the combination of sextant and chronometer that allowed safe navigation of the oceans for generations of seafarers. Despite the accuracy and ease of use of electronic navigation systems, every navigator should be able to use a sextant. It could even save your life in the event of electronics failure. This book describes how a sextant works, provides practical tips and advice on using it, explains how to read as well as take sights, how to make adjustments and correct errors, and finally advises on how to handle and care for the instrument. Book jacket.
Author: Susan P. Howell Publisher: Rowman & Littlefield ISBN: 1493077015 Category : Transportation Languages : en Pages : 274
Book Description
Praised by The Practical Sailor as "a first-class piece of work," Susan P. Howell's Practical Celestial Navigation was developed for Mystic Seaport's navigation courses. This third edition, originally published by the Seaport's Planetarium, retains the step-by-step format of the original, along with an abundance of diagrams and practice problems. Practical Celestial Navigation is recommended as a self-instruction text for beginners or for old celestial hands getting back in practice.
Author: W. F. J. Mörzer Bruyns Publisher: OUP Oxford ISBN: 0191608904 Category : Science Languages : en Pages : 336
Book Description
Sextants at Greenwich consists of two main sections: The introductory chapters and the catalogue of navigating instruments of the National Maritime Museum. The first section gives a general overview of the history of celestial navigation with an emphasis on the instruments that were developed and used for that purpose, between about 1450 and the 1970s. The instruments in the catalogue form the main thread in these chapters. The catalogue consists of 347 entries of instruments for celestial navigation, the octants, sextants and related instruments preserved in the National Maritime Museum. Each entry includes the place of the object's origin, its maker, the object's date, inscriptions (by the maker and/or relating to an owner), the graduated scale, the instrument's dimensions and a general description that includes details such as used materials and detached parts. Finally the object's provenance (previous owners and/or users) and references to literature on its history and handling are given.
Author: Dennis Fisher Publisher: McGraw Hill Professional ISBN: 9780070211209 Category : Crafts & Hobbies Languages : en Pages : 180
Book Description
Latitude Hooks and Azimuth Rings is for people who like to work with their hands and who appreciate traditional nautical craftsmanship. You don't have to be the master of any craft to undertake any of these projects--from a simple kamal or latitude hook to the more complex pelorus or octant--just a careful and enthusiastic worker. These 18 projects fall roughly into three categories: decorative, useful, and somewhere in between. Some, such as the astrolabe, are mainly for display. On the other hand, the sounding line is an important and practical tool for small-craft navigation, particularly in the absence of an electronic sounder. The cross-staff falls somewhere in between, equally at home in the den or the ditch kit. Each of the devices discussed here--with simple, proven building instructions complemented by clear illustrations--has at one time or another been used for the practical business of navigation, and each is worth reviving for its beauty, historic value, or sheer usefulness. Dennis Fisher has designed these projects with an emphasis on simplicity and reasonable cost. Everything can be scratch-built using easily obtainable materials and tools, and each is true to the spirit and function of the original instrument.
Author: David F. Burch Publisher: International Marine/Ragged Mountain Press ISBN: 9780071565585 Category : Navigation Languages : en Pages : 0
Book Description
"Emergency Navigation is far more generally applicable than the title indicates. It is, first and foremost, a detailed account of how to find your position anywhere in the world's oceans after your electronics fail and you lose your sextant, watch, and almanac, but that's really only the beginning. The book is chock-full of good sound navigational techniques and principles that will serve you well regardless of where and under what conditions you are sailing. Hopefully you will never be confronted by the need for emergency navigation, but even the most pleasurable sailing afternoon can be enlivened by a knowledge of the skills and methods taught in this book. Each chapter presumes a fundamental understanding of navigational principles, then deepens and expands that understanding to embrace little-known techniques and makeshfit instruments. Beginning with the assumption that preparing for a navigational emergency is good seamanship, Burch presents detailed discussions on finding time and place at sea; determining direction; steering by wind and swells; steering by the stars; steering by the sun; and steering by other objects in the sky. You will also find chapters on steering under conditions of reduced visibility; piloting in currents; dead reckoning; latitude and longitude; and no-instrument coastal piloting. A final summary tells you what to do in any situation with what you have available at the time. David Burch writes lucidly, and the text is well supported by 127 detailed illustrations. This book offers excellent insights into sound seamanship that will serve you well in all your sailing activities. "A standout in the otherwise faceless navigation texts that passthrough our offices. Anyone venturing offshore should read this book thoroughly."--"Yachting Magazine "Opens the way to pleasurable understanding in a definitive work of instant appeal to seamen of all levels of experience. Full insights into nautical astronomy rarely seen in standard works. . . . Full of sound seamanship for coastal and open water mariners alike."--"The Navigation Foundation "Gives one a deeper understanding of the basic principles of navigation . . . a great store of knowledge which may serve you well in an emergency but will also give much pleasure off watch whilst improving your seamanship in the process."--"British Cruising Association Bulletin "Thorough and authoritative. . . . chapters on steering by the stars, sun, and moon stir the imagination and make one want to be a thousand miles from land . . . Gives us a better understanding of the signposts above the horizon than we might gain from a lifetime of random gazing."--"Sea Kayaker Magazine "Far more than an essay on the principles and practice of emergency navigation, it is a particularly well-written account of the principles of navigation in general and as such cannot fail to bring fresh insights to all of us. Every section and paragraph is permeated with sound practical seamanship . . . Apart from its other virtues, this alone makes it worthwhile."--from the foreword by David Lewis (author of "We, the Navigators and "Ice Bird) "Clearly written in a readable fashion . . . the work is so well thought out and covers so many possibilities that both a beginner and the most experienced navigator will find something of value in its pages. Worth every penny of its cost."--"The Burgee Magazine
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Author: David Burch
Author: W. J. Morris
Author: Peter Ifland
Author: Mary Blewitt
Author: Dag Pike
Author: Susan P. Howell
Author: W. F. J. Mörzer Bruyns
Author: Dennis Fisher
Author: David Burch
Author: David F. Burch