Navigation by Sextant page one.

See also Navigation and Radio

  • 2019 Guide to the Night Sky
  • Atlas of the Southern Night Sky
  • North Star to Southern Cross
  • GPS Afloat
  • The Captain Rude 2102-D Star-Finder
  • The British Admiralty Type Star Identifier
  • Celestial Worksheets
  • Reed's Sextant Simplified
  • The Sextant Handbook
  • Easy Nav Second Edition
  • Celestial Navigation
  • Celestial Navigation Exercises
  • Nautical Almanac 2019 Commercial Edition
  • Norie's Tables. Revised Edition
  • America to Antipodes: Sight Reduction Tables
  • Celestial Navigation CD
  • Celestial Navigation USB

    Sight Reduction Tables for Air Navigation Pub No 249:-

  • Volume 1 - Selected Stars Epoch 2015 - 2019
  • Volume 2 - Latitudes 0 to 40 degrees
  • Volume 3 - Latitudes 39 to 89 degrees

    (See our special Astro deals!)

    There are more books on this subject on the other pages!

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    See also:
    Charts and Hydrographic Publications
    Rite in the Rain All-Weather notebooks.


    by Storm Dunlop. Softcover, 0.15kgs, 150mm x 210mm. Published 2018. 96 pages.
    A comprehensive handbook to the planets, stars and constellations visible from the southern hemisphere. 6 pages for each month covering January–December 2019.

    This practical guide is both an easy introduction to astronomy and a useful reference for seasoned stargazers. Now includes a section on comets and a map of the moon.
    Diagrams drawn for the latitude of southern Australia, but including events visible from New Zealand and South Africa.

    Content includes:

  • Advice on where to start looking.
  • Easy-to-use star maps for each month with descriptions of what to see.
  • Positions of the moon and visible planets.
  • Details of objects and events you might see in 2019.
  • Diagrams of notable events visible from Australia, and some for New Zealand and South Africa.

    NZ$20.00 + delivery.

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    by Steve Massey. Softcover, 1.23kgs, 215mm x 280mm . Fourth Edition. Published 2016. 302 pages.
    If you ever needed a book to help you explore the wonderful night skies from down under, be it Australia, South America, South Africa or New Zealand, this is it. With hundreds of full colour star charts and maps of the Moon and planets of our Solar System, this book will ensure you get the most out of a pair of binoculars or a small telescope from suburban and dark country sky locations. Beautifully illustrated with many tips and advice on how to both understand, observe and even photograph the night sky, including the stars, galaxies, nebulae, Sun, Moon, asteroids, comets and planets from the back yard, this book is your essential guide and reference to the celestial wonders of the Southern Night Sky. Information on common telescope designs and tips for observing the night sky.

    NZ$50.00 + delivery.

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    by Will Kyselka & Ray Lanterman. Softcover, 0.27kgs, 150mm x 230mm Publ. 1976.
    Concise field guide to stars and constellations presented in a month-by-month selection of star charts. (Kind of field guide to the stars). The text takes up astronomy old and new, with brief stories of the constellations, short subjects, from the Crab Nebula to black holes and gravitational pulses

    NZ$35.00 + delivery.

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    By Bill Anderson. Pbk, 172mm x 240mm, 126 pages, full colour drawings and photographs.
    The Global Positioning System has revolutionised small boat navigation. A GPS set gives your position to within 20 metres, anywhere on earth. Punch in your destination and the machine gives the data you need to sail or motor to your target. The dream of navigators through the ages - always to know exactly where they are and where they are going - has finally been realised.

    GPS Afloat explains, to the novice or traditional navigator, what the system can and cannot do. in a very short time you will be entering Waypoints, planning Routes and watching the Crosstrack Error as though they were old friends. You will also understand how to check your results using traditional navigation, common sense and the Mark 1 eyeball.

    Learn all about:

  • Choosing a set.
  • Getting started.
  • Position fixing.
  • Outputs.
  • Waypoint navigation.
  • Passage making.
  • Pilotage.

    NZ$45.00 + delivery.

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    The unit consists of a base plate (northern hemisphere on one side, southern on the other) plus a set of latitude plates. Use the nautical almanac to look up the Greenwich Hour Angle of Aries for the time of interest (usually Civil Twilight - also obtained from the nautical almanac), then set the closest latitude disk on the base plate. Rotate the arrow on the latitude disk to the Local Hour Angle of Aries on the graduated edge of the base-plate, and you have in your hand a picture of the sky around you, showing the stars visible at twilight. From the disk you can read the azimuths (bearings), and altitudes (angular height above the horizon) of the stars. The planets, sun and moon can be marked in pencil onto the base-plate for a specific date and their approximate positions in the sky obtained at the same time as the starts. This is an invaluable device for celestial navigators and also useful for more general star-gazing. The star-finder should be a complimentary tool to the sextant in any blue-water navigator's kit.

    Was NZ$90.00 + delivery.
    Now NZ$75.00 + delivery.

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    Click for details of the Star Identifier
    This tool, like that above, is used to predict the bearing from true north (azimuth) and angle above the horizon (altitude) of the brightest stars. It is used for setting up star sights so that observations can be made using a firm horizon, by pre-setting the sextant and looking over the compass. In this way stars can be observed through the telescope before they are easily visible to the naked eye.
    Star sights using this technique are much more accurate than if taken when the sky is dark enough to recognise the stars in constellations with the naked eye, due to the superior quality of the horizon. The instructions provided with the identifier are explicit.
    Planets can also be pre-set using the identifier, enabling daylight sights of Venus and occasionally Mars and Jupiter.
    The main point of difference with the 2012-D above is the quality. The British Admiralty type has a card base-plate and wallet whilst the 2012-D is of strong plastic throughout.

    NZ$55.00 + Delivery

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    Click for details of the Celestial 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$17.50 + Delivery.

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    By Dag Pike. Pbk, 140mm x 210mm, 104 pages, monochrome drawings. 0.15 kg. Published 2003
    Despite the accuracy and ease of use of electronic navigation systems, every navigator should be able to use a sextant. 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.

    Dag Pike is a seaman and navigator of great experience, and is best known as the navigator of Virgin Atlantic Challenger, on its successful record attempt.

    NZ$37.50 + Delivery

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    THE SEXTANT HANDBOOK Adustment, Repair, Use and History
    By 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$49.00 + Delivery

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    EASY NAV, Second Edition.
    By Frank Dinkelaar. Pbk with plastic laminated end-covers, spiral bound, 280mm X 210mm, 64 pages plus worksheets, monochrome tables and plans.
    This is a complete astro-nav unit for the Sun and Stars, excluding only the clock and sextant. A perpetual almanac for the sun and stars is provided, together with a method of sight reduction. Clear work-sheets are used for all computations together with a full set of instructions.
    The tables cover the epoch 2000 - 2099 ie. well beyond any on-board navigation concern of anyone reading this review!
    Easy Nav is the best celestial "emergency nav-pack" we have come across, apart from a spare GPS!
    This second edition has a much improved layout and some small typos have been corrected.

    NZ$55.00 + Delivery.

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    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$80.00 + Delivery.

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    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 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, 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$55.00 + Delivery.

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    0.68 kgs, Paperback, 177mm x 254mm, 364 pages.
    This is a yearly celestial almanac (valid from January 1st 2019 to December 31st 2019) 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.
    It should not be confused with the New Zealand Nautical Almanac, which it in no way resembles. It can be regarded as a complete substitute for the British Admiralty Abridged Nautical Almanac, which is nearly double the price.

    NZ$75.00 + Delivery. See our Super Special Astro Deal!!

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    1.72 kgs, Hardback, 210mm x 305mm, 576 pages. Revised Edition 2018

    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.

    Since the last update in 2007, the editor, George Blance, has made many changes- new tables have been included and obsolete ones deleted to conform with changing techniques of navigation, with the aim of improving the accuracy of the calculated position and reducing the tedium of the calculation. The section: Seaports of the World has again been extensively updated and restructured with several hundred additional ports. The ports are listed geographically and also indexed alphabetically to aid identification.

    NZ$120.00 + Delivery.

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    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.

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    By Mike Scanlan. E-book, 177 pages.
    This book is an e-book, a complete book published in electronic form. The book was originally written as a companion to Coastal Navigation. The book is formatted into 177 pages, complete with a Contents, 11 fully-illustrated chapters, a Glossary of celestial navigational terms, and an Index. There are also 4 Appendices, covering the use of a scientific calculator, navigational formulas, navigational accuracy, and all the necessary extracts from the Nautical Almanac.

    NZ$20.00 + Delivery.

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    By Mike Scanlan. USB Memory Stick Format.

    NZ$30.00 + Delivery.

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  • Volume 1 - Selected Stars Epoch 2010
  • Volume 2 - Declinations 0 to 29 degrees north and south; Latitudes 0 to 40 degrees north and south.
  • Volume 3 - Declinations 0 to 29 degrees north and south; Latitudes 39 to 89 degrees north and south.

    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 2010.

    NZ$75.00 + delivery.

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    Sight Reduction Tables for Air Navigation, Pub. No 249 Volume 2 Latitudes 0 to 40 degrees.

    NZ$75.00 + delivery.

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    Sight Reduction Tables for Air Navigation, Pub. No 249 Volume 3 Latitudes 39 to 89 degrees.

    NZ$75.00 + delivery.

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    Special Astro Deal! - save 10%:

    Sight Reduction Tables Volumes 1, 2 and 3 (the full set)

    Only NZ$200.00 + delivery.

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    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$270.00 + delivery.

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    Navigation by sextant page one.

    See also Shipwrecks and Maritime Disasters

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