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Light Wedge
$40.00
The LightWedge night vision light is perfect if you need to read your chart or make log entries but also want to preserve your night vision at the helm. The elegant, simple design of this night light features a patented technology that uses LED?s and a tapered, wedgeshape lens that directs all the light down on the chart or page being read. The distortion-free optical-grade acrylic lens reflects red LED edge light onto the page or chart, not into your eyes. There are two light brightness settings. The simple push of a button adjusts the light from bright to dim to off.
There are no bulbs to burn out. Four AAA batteries (not included) provide 40 hours of light, and they can be easily replaced. The one touch operation on-off switch allows you to conserve battery life when not in use. The LightWedge illuminates your charts, maps and books with ease. It is light and easy to handle and pack.
Dimensions: 9 1/4" High x 6 3/4" Wide
Weight 8.5 oz. (with batteries)
Celestial Navigation In A Nutshell by Hewitt Schlereth
$13.95
This is a modern perspective on celestial navigation, by a very expert and easy to read author. Even though he explains everything with simple relationships, he does confine his comments to celestial navigation. No attempt is made to rehash basic navigation procedures. This is why we recommend it as an intermediate book. On the other hand, if you have had previous experience with celestial navigation, this book will provide you with a wonderful reunion! It covers taking sights by the sun, moon, stars and planets, and discusses the advantages and disadvantages of each method. The author is partial to HO-249 sight reduction, but this should not deter an HO-229 fan. You will be taken carefully through several examples and situational illustrations, making this a very effective self-teaching guide. We highly recommend this book.
SC, 2000, 136 pages,
CelestNav for PDA
$49.95
CelestNav is a full-featured celestial navigation solution for the Palm OS ® family of handheld computers. It runs on any Palm OS handheld with version 3.0 or higher. This includes the entire Palm III/V/VII/M100 families, Visors, Symbol, TRG, and IBM units.
- Almanac for ALL bodies (to year 2031)
- Sight Reduction
- Fix Computation
- Running Fix
- Dead Reckoning
- Passage planning by great circle and rhumb line
The program guides you through the steps of computing a celestial fix. It records your sextant observations with sight times; applies the appropriate corrections for height of eye, atmospheric refraction, backsights, and sextant errors; combines multiple sights into a celestial fix; computes your position automatically; and maintains a dead-reckoning position from your last known fix. CelestNav is supplied on a CD with digital documentation. SW 0.5 lb.
MacNavigator
$79.00
MacNavigator is a fully interactive, integrated navigation program for Macintosh. It will handle all aspects of passage planning with waypoints on either rhumb line or great circle courses; all aspects of enroute navigation with running fixes, DR and ETA computation, and set and drift; and all aspects of celestial navigation with a perpetual almanac built-in.
The celestial portion is a truly ingenious program for the Macintosh. It presents data entry (sextant altitude, time, and body) as blanks to be filled in on a sight form. Thus, one sees where they fit in with the other computations that could be taken from tables, or from letting the computer work out. This is done for the sun, moon, 59 stars, and 4 planets. Secondly, the program plots up to 10 lines of positions for respective observations, advances or retards them as desired, and even draws a confidence ellipse for the resulting fix. This is the only program we know of that draws this ellipse! Where a printed output is desired, one may "print the screen" at any time. Printouts of the various filled-in sight forms are a wonderful way to learn the subject, as well as to compare your results with others using conventional methods.
Compass Correction
$9.95
Tells you how to swing ship, set up deviation tables and adjust compasses. It describes the numerous causes of compass error: variation, deviation, misalignment, lazy compass, frozen compass, and intermittent deviation. It begins with the very basics of magnetism and progresses to a working knowledge. The "quick and easy" tools of Compass Corrector for bearings from the sun, and Skyclock for bearings on Polaris, reprinted in the book give it intrinsic value. No other Almanac is needed!
SC, 1997, 70 Pages. SW 0.5 lbs
Greenwich Time and the Longitude by Derek Howse
$35.00
This beautifully illustrated book is a classic among historical accounts of Greenwich Time and its relationship with longitude. It relates the progress of Greenwich Time from 1676, when it was first established for use at the new Royal Observatory, to the present day when it has become the basis for timekeeping the world over. It is also the story of finding the longitude at sea, which was the specific problem that the Observatory was founded to solve. Greenwich became a household name when in 1884 its longitude was chosen as the Prime Meridian. Relevant developments in astronomy, navigation, and timekeeping are explained in simple terms - including the atomic clock, GPS and the leap second, and Co-ordinated Universal Time. Appendices include finding time by lunar distance, lunar eclipse, and eclipses of Jupiter's satellites.
HC, 1997, 199 pgs. SW 2.2 lbs.
The Mapmakers by John N. Wilford
$30.00
It began with Aristotle, Ptolemy and the first voyages across the Mediterranean in sailing vessels, and now we have satellite mapping. But the process is by no means over, and this book provides a kind of frame in which the history of global exploration and man's increasingly firm grasp of the world around him enlarges and expands in a most satisfying reading experience.
HC, 2000, 505 Pages.
Navigation in the Age of Discovery by Duane A. Cline
$17.95
An excellent modern introduction to navigation instruments and techniques of the 15th through 17th centuries. Drawings and in-depth descriptions of practically every instrument used are included. This is a good historical work which highlights the activities in particular, of the Mayflower. Extensive bibliography.
SC, 1990, 214 pages. SW 1.4 lbs.
Reed's Sextant Simplified by Dag Pike
$19.00
Actually, a re-write of an earlier book by the well known, and late Capt. O.M. Watts, this little book has been brought up-to-date by Dag Pike, a likewise very well known navigator and author. As it must, this book gives a description of the sextant, discusses its principles, and instructs in its practical use and care. But it is packed with information! Everyone who has read it (and who knows something about navigation) has nothing but praise for it. It is small enough to fit in most sextant boxes, and we recommend putting it there... after reading it of course. Sized 5.5 x 7.3 inches.
SC. 1995. 104 pages.