Celestial Navigation by Tom Cunliffe

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 steer one's boat at the seas is having fun with a comeback. in case you don't desire to be stuck brief while sleek know-how fails on board, realizing how you can chart a course by means of a sextant is an important navigating ability. In Celestial Navigation , veteran yachtsman, Tom Cunliffe, unearths how any boat proprietor can grasp this seafaring approach, with out advanced arithmetic, utilizing his simplified process. Readers commence with a legitimate starting place of easy techniques 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 may be figuring out your range from a midday sight, and studying tips on how to plot a place from watching the solar, planets, moon or stars-or anywhere you will be at the world's oceans.Helps readers arrange for the RYA Yachtsmaster Ocean examination, inclusive of celestial navigation as a demand comprises transparent diagrams and labored examples to assist consultant the amateur navigator new version has downloadable fabric, a brand new bankruptcy on digital navigation in addition to the bonus function of on-line video demonstrations no matter if getting down to sea on a quick or lengthy trip, Celestial Navigation is a necessary advisor to utilizing the sunlight, moon, planets, and stars as your guideposts domestic

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Sample text

L’ and ‘U’ refer to the upper and lower limb and you can choose accordingly. Example 3 One of the altitude correction tables for the Moon from the end of The Nautical Almanac. 4? The sight was of the Moon’s lower limb. 6. 5, obtained by dropping straight down the column from correction 1 and selecting the subcolumn headed ‘L’. Both corrections are added to the apparent altitude and when applied give the true altitude (Ho) for the Moon’s lower limb. If you observed the upper limb, you’ll have to subtract 30′ from the result, as in the third correction on the pro forma.

At this point, let me remind you that most difficulties and errors arise from carelessness in looking things up or in reading the sextant. Keep a firm grip on your head. Go one step at a time and every sight will be a winner. Now try it 1st May. You take a forenoon sight at 09 h 15 m 23 s watch time. 4. Your height of eye was estimated to be eight feet, your watch was six seconds fast and your sextant has no index error. The DR position was 49°12′N 5°10′W. 5. You have been steering 085°T and the tide has cancelled itself out.

Now try it 1st May. You take a forenoon sight at 09 h 15 m 23 s watch time. 4. Your height of eye was estimated to be eight feet, your watch was six seconds fast and your sextant has no index error. The DR position was 49°12′N 5°10′W. 5. You have been steering 085°T and the tide has cancelled itself out. Plot your PL. You will find the working and the finished plot on page 43. Don’t look at it now; use it to check your own efforts. Working through an example like this is the best way to learn, and with a subject like celestial navigation it is probably the only way.

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