Year: 2016 Language: english Author: Pike D. Genre: Reference book Publisher: SHERIDAN HOUSE Format: PDF Quality: Scanned pages Pages count: 116 Description: The sextant is the purest of navigation instruments. It allows a position line to be determined without reference to any other instruments or systems. With horizontal angles the position can be fixed from marks without any corrections being necessary. Vital ranges can be determined by using vertical angles. Latitude can be found from angles of the sun on the meridian or from the Pole Star. Bring in the chronometer and the position can be determined with adequate accuracy for ocean navigation. No wonder that the sextant has been the treasured navigation device of generations of seamen and airmen. Its early attraction was the fact that position could be determined with good accuracy for ocean navigation, and it was largely the combination of the sextant and the chronometer which opened up the era of safe and reliable ocean navigation across the Atlantic and Pacific Oceans. Position could be determined without reference to any external systems, although the requirement for clear skies and a co-operative horizon could limit the availability of positions. It is the independent nature of the sextant/chronometer combination which still makes it attractive in the electronic era. All electronic systems are dependent on external radio transmissions of one sort or another to allow position to be determined. These modern electronic systems can produce accurate positions virtually at the touch of a button, but seamen in particular are concerned not only with accuracy but also with reliability. The time may come when the reliability of the electronic system is such that the sextant becomes redundant. That time is not now, and the sextant is still treasured by a multitude of seamen because of the independence it offers to the navigator. For many navigators the sextant may have been relegated to the role of a back-up system but that is no excuse for not understanding the way the sextant works and how to get the best out of it. The sextant still has a treasured place in the navigation equipment of many ocean-ranging yachtsmen. It is the traditional way of fixing position, and to the navigator who gets his power from the wind, tradition can be important. For professional and amateur navigator alike, the sextant is still the purest of navigation instruments, and here we explain its design and workings, its accuracy and its care, in the hope that the reverence accorded to the sextant in the past will live long in to the future
Contents
Description of the sextant The principle of the sextant How to take sights Practical hints on taking sights How to read the sextant Errors and adjustments Sextant telescopes and other accessories Practical notes on the care of the sextant The sextant and coastal navigation
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Pike D. Reed's Sextant Simplified
Language: english
Author: Pike D.
Genre: Reference book
Publisher: SHERIDAN HOUSE
Format: PDF
Quality: Scanned pages
Pages count: 116
Description: The sextant is the purest of navigation instruments. It allows a position line to be determined without reference to any other instruments or systems. With horizontal angles the position can be fixed from marks without any corrections being necessary. Vital ranges can be determined by using vertical angles. Latitude can be found from angles of the sun on the meridian or from the Pole Star. Bring in the chronometer and the position can be determined with adequate accuracy for ocean navigation.
No wonder that the sextant has been the treasured navigation device of generations of seamen and airmen. Its early attraction was the fact that position could be determined with good accuracy for ocean navigation, and it was largely the combination of the sextant and the chronometer which opened up the era of safe and reliable ocean navigation across the Atlantic and Pacific Oceans. Position could be determined without reference to any external systems, although the requirement for clear skies and a co-operative horizon could limit the availability of positions.
It is the independent nature of the sextant/chronometer combination which still makes it attractive in the electronic era. All electronic systems are dependent on external radio transmissions of one sort or another to allow position to be determined. These modern electronic systems can produce accurate positions virtually at the touch of a button, but seamen in particular are concerned not only with accuracy but also with reliability. The time may come when the reliability of the electronic system is such that the sextant becomes redundant. That time is not now, and the sextant is still treasured by a multitude of seamen because of the independence it offers to the navigator.
For many navigators the sextant may have been relegated to the role of a back-up system but that is no excuse for not understanding the way the sextant works and how to get the best out of it. The sextant still has a treasured place in the navigation equipment of many ocean-ranging yachtsmen. It is the traditional way of fixing position, and to the navigator who gets his power from the wind, tradition can be important. For professional and amateur navigator alike, the sextant is still the purest of navigation instruments, and here we explain its design and workings, its accuracy and its care, in the hope that the reverence accorded to the sextant in the past will live long in to the future
Contents
Description of the sextantThe principle of the sextant
How to take sights
Practical hints on taking sights
How to read the sextant
Errors and adjustments
Sextant telescopes and other accessories
Practical notes on the care of the sextant
The sextant and coastal navigation
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