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Sight Reduction Tables for Air Navigation Pub No 249:-
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PRACTICAL GUIDE TO CELESTIAL NAVIGATIONBy Phil Somerville. Hardback, 0.86 Kgs, 220m x 285mm, 152 pages, published 2021.
Step by Step Instructions for when you've lost the plot.
The jargon-free guide to celestial navigation - know what to do step by step, understand why you're doing it, and be confident that you can put it into practice when on board.
Learn the essentials of celestial navigation step by step, understand the theory and have the confidence to put it into practice when on board.
Somerville breaks down what you need to do to successfully fix your position using the biggest celestial object in the sky--the sun--by explaining why at every point.
Includes checklist sheets and an informal teaching style.
Fully illustrated in color.
NZ$65.00 + delivery.
CELESTIAL NAVIGATION FOR YACHTSMEN. 13th EditionBy Mary Blewitt. Paperback, 84 grams, 138m x 212mm, 78 pages, black & white illustrations and tables, published 2017.
The 13th Edition of this bestselling textbook 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 making a tricky subject easy to understand.
This edition has been thoroughly revised by Andy Du Port to ensure that it remains entirely relevant to offshore sailors today.
NZ$25.00 + delivery.
CELESTIAL NAVIGATION.By Tom Cunliffe. Published 2010. Paperback, 0.21kg. 170mm x 240mm, 65 pages, full colour photographs, tables and drawings.
Celestial navigation is one of the oldest of the mariner's arts - and one of the most awe-inspiring. It is also essential for every ocean sailor who wants to be able to fix his position should the GPS fail.
Tom Cunliff shows how to master the art in easy stages. His talent is to educate without intimidating. Within a few pages you'll be taking your first sight. From there it is a short step to plotting your position, wherever you may be on the world's oceans.
New Edition features:
Whether you need to pass an exam, want a back-up to gps positioning or simply choose to delight in the wonder of the cosmos, this is the perfect guide.
NZ$40.00 + delivery.
CELESTIAL NAVIGATION USB.By Mike Scanlan. USB Memory Stick Format.
This e-book, published in digital format as an interactive pdf file, includes eleven chapters, each illustrated with numerous coloured diagrams and worked examples, describing all aspects and techniques of navigation using the sun, moon, stars and planets.
The use of the sextant is fully explained, together with the detection and correction of sextant errors. Position-fixing techniques, including the use of the intercept method and meridian altitudes, using formulae and a common scientific electronic calculator, are also fully explained and demonstrated, and the use of celestial bodies for calculating the boat’s compass error.
Four appendices explain the use of the scientific calculator, a summary of all navigational formulas used in the book, an explanation of celestial navigational accuracy, and all the necessary extracts from the Nautical Almanac for the book’s worked examples.
NZ$30.00 + Delivery.
RYA ASTRO NAVIGATION HANDBOOK. By Tim Bartlett. Paperback, 0.26kg, 170mm x 245mm, 80 pages, full colour illustrations.
Something different to expand the RYA navigation series, Tim Bartlett’s RYA Astro Navigation Handbook delves into the ancient art of navigating by the moon and stars.
Within the book, the reader will find a range of information from the basics of Astro navigation, right up to how to use the more complex formulas involved in the art.
This book is an ideal progression from any basic navigation books.
“Written by a long-time MBY contributor, this covers the very basics to the advanced, using excellent photos and illustrations”.
NZ$40.00 + delivery.
Click for details of the Celestial WorksheetsCELESTIAL WORKSHEETS The worksheet pads are designed to be used as an adjunct to class-room teaching; each one contains a copy of table 5 (corrections to Ho for minutes of declination), and a copy of the altitude correction tables for the sun and stars, including dip. There are 15 sight-sets, each of which contains worksheets for 2 sun sights, one meridian passage, and a plotting sheet. The plotting sheet is scaled at 100 mm to 40 miles and contains a compass rose and a departure to difference in longitude graph, similar in orientation to the standard US Navy plotting sheet. Each page has a panel for certifying the contents as unaided work; this would satisfy the need for practical sights required for certificates by some administrations.
NZ$25.00 + Delivery.
THE SEXTANT HANDBOOK Adustment, Repair, Use and HistoryBy Bruce Bauer. Pbk, 150mm x 235mm, 189 pages, monochrome drawings and photographs.
" The wealth of useful material is prodigious and by the time one has reached the back cover, the sextant is an old friend. Just as important, Cdr. Bauer deals comprehensively with maintenance and sevice and his advice on how to select and assess a second-hand sextant is truly worthwhile. Refreshingly, he writes in a friendly manner-almost as though he is chatting to a group of students. A thoroughly enjoyable book". (Peter Milne Technical Editor, Yachting World) Then the last chapter is on "Sextants of Tomorrow" very interesting.
NZ$50.00 + Delivery
100 PROBLEMS IN CELESTIAL NAVIGATION, Self-Contained - With Answers.By Leonard Gray. Pbk, 215mm x 280mm, 168 pages, monochrome drawings and tables.
This book is a self-contained book of realistic celestial and other blue-water navigation problems. The text includes all of the necessary Nautical Almanac and Sight Reduction Table pages, with answers and full explanations.
All of the commonly encountered navigational problems are covered, as well as those that are used only occasionally and whose routines may have been forgotten, such as the backsight for bodies nearly overhead or in cases where the "front" horizon is obscured, finding Venus and Mars in daylight, and storm avoidance.
An appendix contains a photocopiable sight reduction form and a review of procedures and methods for taking the various sights.
This book is an extremely practical self-tutorial for newcomers, and also experienced navigators who want revision or up-skilling in the arts.
NZ$65.00 + delivery.
CELESTIAL NAVIGATION
By Dominique F Prinet. Softcover. 0.76 kgs, 218mm X 280mm, 216 pages plus tables and line drawings.
Designed specifically for students of Celestial Navigation courses, this manual explains how to obtain approximate latitudes or longitudes with primitive tools, or an exact position with a sextant and the relevant tables. It has been constantly improved over 12 or 13 years of classes to reflect the comments from over 150 students. The manual prepares mariners for the official tests such as those organized by the RYA, ASA, Sail Canada and other certification agencies.
It explains the concepts behind the procedures, and carefully guides the students from step to step through numerous illustrations as well as graphics, examples, exercises, and sample cruises. It has been well proven over many years, and has allowed numerous mariners to pass the tests through self-study. All the required tables are included, as well as the simple work forms and plotting sheets. These can be reproduced by photocopy.
NZ$100.00 + Delivery.
CELESTIAL NAVIGATION EXERCISES
By Dominique F Prinet. Softcover. 0.49 kgs, 218mm X 280mm, 192 pages plus tables and line drawings.
This book was designed specifically to facilitate the work of instructors using the free PowerPoint slide presentation available at CelestialNavigationBook.com. This exercise manual, available in hard copy and in PDF format for tablets, reproduces the questions posed at regular intervals throughout the slice presentation; it provides the work-forms guiding the calculations, and the solutions.
Students taking a course from an instructor who follows the slide [presentation will normally have the associated course book Celestial Navigation using the Sight reduction Tables Pub. No. 249 In order to facilitate the download process, the free version of the exercise manual (available for download at CelestialNavigationBook.com, includes neither the almanac nor the Sight reduction tables required for calculations because these tables are identical to the ones in the course book.
This complete version of the exercise manual, with all the required data tables in the appendix, will thus be useful mostly to navigators who do not have the course book but wish to practice on their own, as well as to students who follow the presentation and have the course book but do not wish to download and print 140 pages of questions and answers.
NZ$100.00 + Delivery.
CELESTIAL NAUTICAL ALMANAC 2023 COMMERCIAL EDITION.0.69 kgs, Paperback, 177mm x 254mm, 364 pages.
This is a yearly celestial almanac (valid from January 1st 2023 to December 31st 2023) for sights and general use of the sun, moon, stars and planets, giving world-wide astronomical information.
Apart from sights for position lines it contains information allowing the calculation of sunrise and set, and moonrise and set anywhere in the world, and information on eclipses and regional and national time differences.
NZ$85.00 + Delivery. See our Super Special Astro Deal!!
NAUTICAL ALMANAC (NP314-24) 2024.By British Admiralty 1.29 kgs, Hardback, 215mm x 305mm, 360 pages. Published 2023
The Nautical Almanac contains astronomical information to support bridge crews in routine and emergency celestial navigation, as well as the calculation of daylight hours and mandatory gyro checks. It is carried on every ship within the Royal Navy and is at the core of celestial navigational training courses worldwide.
The Nautical Almanac includes:
NZ$175.00 + Delivery.
NORIE'S NAUTICAL TABLES.1.8 kgs, Hardback, 210mm x 305mm, 576 pages. Revised Edition 2022
Since J W Norie published the first edition of this famous set of mathematical tables (in 1803), the book has become – and remained - a bestseller. Despite developments in electronic navigation it remains an essential requirement for anyone learning and practising astro-navigation.
Since the commissioning of the Global Positioning System (GPS), its proven accuracy and reliability in all weather conditions have resulted in confidence and almost unquestioning dependence on its ability to provide a vessel’s position, course and speed. Because of this, some seafarers feel that the traditional navigational methods are obsolete. However, the marine environment of heavy vibration, stormy seas, salt-laden spray and wide temperature variations can easily damage electronic equipment. No prudent seafarer would proceed on an ocean passage without a reliable navigational back-up.
Because of the difficulties which may be experienced if GPS should be unavailable, the book gives an explanation in the form of a detailed step-by-step description, by means of worked examples, of the different methods of calculating the ship’s position using the tables and/or a pocket calculator.
The current edition has been revised to present the formulae in an appropriate format for direct entry to a scientific calculator. Because the possibility of navigation without even an appropriate calculator exists, the logarithms have been retained.
The section Seaports of the World are listed geographically and also indexed alphabetically to aid identification.
NZ$170.00 + Delivery.
AMERICA TO ANTIPODES Sight Reduction Tables, For latitudes 45° north to 45° south.Published by Captain Teach, Pbk, 300mm x 210mm (A4).
The tables provide sight reduction using the presentation and processes of the joint US-UK air-sight reduction tables, AP 3270. Our edition enable sight reduction for all celestial bodies of declinations from 30°north to 30° south, and latitudes 45° north to 45° south. Included are the sun, moon, planets and 30 of the 57 stars on the daily pages.
There is no longitude constraint, and the latitude limits include all of the Tasman Sea, and the Pacific from the Forveaux Strait to the northern extremity of Japan.
NZ$55.00 + Delivery.
SIGHT REDUCTION TABLES FOR AIR NAVIGATION, Pub. No 249, Commercial Edition
Reproduced from US Government published tables. Pbk, 215mm x 265mm.
These are exact reproductions of the official US and hence British tables for sight reduction.
Volumes 2 and 3 are perpetual, volume 2 being the most wanted as it covers all voyaging between the most frequented parallels of latitude, 40 degrees north to 40 degrees south. The declination limits allow sights of the sun, Moon and navigational planets, as well as the majority of navigational stars.
Volume 1, Selected Stars, includes stars having declinations beyond the limits bounded by volumes 2 and 3, and also serves as a means of predicting star azimuths and altitudes for planning early star sights to allow the use of a well-lit horizon. This volume also serves the same purpose as and eliminates the need for a star identifier. Each edition of Volume 1 covers only a five-year period.
See our Special Astro Deal! and our Super Special Astro Deal!!
Sight Reduction Tables for Air Navigation, Pub. No 249 Volume 1 Selected Stars Epoch 2025.
NZ$105.00 + delivery.
Sight Reduction Tables for Air Navigation, Pub. No 249 Volume 2 Latitudes 0 to 40 degrees.
NZ$105.00 + delivery.
Sight Reduction Tables for Air Navigation, Pub. No 249 Volume 3 Latitudes 39 to 89 degrees.
NZ$105.00 + delivery.
Special Astro Deal! - save 10%:
Sight Reduction Tables Volumes 1, 2 and 3 (the full set)Only NZ$283.50 + delivery.
Super Special Astro Deal!! - save 10%:
The latest Celestial Nautical Almanac plus Sight Reduction Tables Volumes 1, 2 and 3 (the full set)Only NZ$360.00 + delivery.
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