By Tom Cunliffe
Guiding a craft utilizing one of many oldest of the mariner's arts-celestial navigation As romantic--sounding as crusing to Tahiti did centuries in the past, utilizing the solar, moon, planets, and stars to lead one's boat at the seas is having fun with a comeback. in the event you don't desire to be stuck brief while sleek expertise fails on board, realizing how one can chart a course using a sextant is a vital navigating ability. In Celestial Navigation , veteran yachtsman, Tom Cunliffe, unearths how any boat proprietor can grasp this seafaring procedure, with no advanced arithmetic, utilizing his simplified procedure. Readers start with a legitimate beginning of uncomplicated thoughts and definitions, earlier than relocating directly to the hardware-the sextant and the way to take advantage of it. inside a couple of pages, you will be figuring out your range from a midday sight, and studying find out how to plot a place from looking at the solar, planets, moon or stars-or at any place you'll be at the world's oceans.Helps readers organize for the RYA Yachtsmaster Ocean examination, together with celestial navigation as a demand comprises transparent diagrams and labored examples to aid consultant the beginner navigator re-creation has downloadable fabric, a brand new bankruptcy on digital navigation in addition to the bonus characteristic of on-line video demonstrations no matter if getting down to sea on a quick or lengthy trip, Celestial Navigation is an important consultant to utilizing the sunlight, moon, planets, and stars as your guideposts domestic
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Guiding a craft utilizing one of many oldest of the mariner's arts-celestial navigation As romantic--sounding as crusing to Tahiti did centuries in the past, utilizing the solar, moon, planets, and stars to lead one's boat at the seas is having fun with a comeback. should you don't desire to be stuck brief while smooth know-how fails on board, figuring out the right way to chart a course because of a sextant is a necessary navigating ability.
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Extra resources for Celestial Navigation
Indd 39 7/15/2010 10:48:22 AM 40 CELESTIAL NAVIGATION In east longitude, adjust the minutes of longitude so that when added to the minutes and seconds of the Sun’s GHA they add up to a whole number. It’s as simple as that. 7 271° AZIMUTH AND INTERCEPT A working page from Volume 3 of AP3270 will be found on page 35. Notice that the top right-hand corner gives the latitude 49°. There is a different set of pages for each latitude. Which page of the set you choose is decided by the top central legend, which in this case reads ‘Declination (15°–29°) SAME name as latitude’.
Indd 27 In coastal waters the scale may well allow a sight to be plotted directly onto the working chart. On an ocean chart, the width of the pencil line becomes a significant factor and accurate plotting is impossible. Instead, use a plotting sheet. These can be made up yourself, but they are so cheap to buy that I always kit up with a sheaf before I set sail. So long as a quality eraser and a sharp 2B pencil make up your plotting kit, they are recyclable, so don’t worry about having enough to last the voyage.
Grab what you can when you can. 7 Look up the star’s altitude for the current LHA of Aries and set your sextant to this figure. Then hang your handbearing compass round your neck and nip up on deck. Use the compass to look down the azimuth of the star (don’t forget to allow for magnetic variation: azimuths are in degrees True), then ‘fix’ the direction with a cloud, or star, or ship, or something. If there is nothing, you’ll just have to concentrate harder. Now look towards the horizon in that direction through your pre-set sextant.