Marine Link
Tuesday, December 18, 2018

Navigation

Navigation, derived from the Latin words "navis" (meaning  "ship") and "agere" (meaning "to drive") is the process of accurately determining the position and controlling the movement of a craft or vehicle along a desired course. This is accomplished by finding the navigator's position compared to known locations or patterns.

Early instruments used for determining latitude were the quadrant, (which measured the altitude of the polestar or the noonday sun,) the astrolabe and the sextant. Longitude was originally fixed using chronometers and tables showing yearly positions of celestial bodies. The first mariners to explore the world’s oceans developed standard ways of observing and recording their location, the routes they traveled, wind and water currents, and other useful facts. These records, logs, and journals made it possible find their way home and pass along their observations. Each successful voyage became a part of an expanding collection of reliable maritime information.

Modern navigation systems are part of a tightly coordinated and widely integrated transportation system in which each vessel must be responsible for staying on course, avoiding collisions, minimizing fuel consumption, and keeping on schedule. Modern navigation systems make use of many traditional tools, such as compasses, charts, instruments; but over the past century radio beacons, satellite networks and global positioning systems have been relied upon with increasing frequency to determine a ship’s position.

Ship compasses are usually stabilized by gyroscopes and installed in housing which properly compensates for the vessel’s motion. Charts are another essential navigational tool- position is fixed using charts of known locations in concert with instruments that calculate a vessel’s relative bearing. Dead reckoning is a method which relies on recording the accurate velocity calculated by gyroscopes and computer analysis of the vessel’s acceleration.

Tags: Navigation

Image: Inland Waterways Authority of India (IWAI)

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(Photo: Seacat Services)

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Image: Cheng Lie Navigation

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From left: Dimitra Kosta, Customer Support Director SRH Marine Electronics, Erik van der Noordaa, John Laderos and Wim Nieuwveld (Global Contract Manager Radio Holland). (Photo: Radion Holland)

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New York City. U.S. Coast Guard photo illustration by Petty Officer 1st Class Jetta Disco.

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Pic: Finnish Transport Agency

Finnish Transport Agency Issues Winter Navigation Guidelines

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Falco (Photo courtesy of Rolls-Royce)

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Photo; Moose Boats

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Image: © niyazz - fotolia.com / europa.eu

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The Coast Guard and three good Samaritan vessels assisted in the rescue of 15 people from a lift boat near Grand Isle, La., November 18, 2018. (U.S. Coast Guard photo by Alexandria Preston)

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Maritime Reporter Magazine Cover Dec 2018 - Great Ships of 2018

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