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celestial navigation

Overview page. Subjects: Maritime History.

The sextant, the chronometer (nowadays possibly a quartz watch), the nautical almanac, and navigation tables (now perhaps some form of calculator or computer) in one form or another remain...

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chronometer

Overview page. Subjects: Maritime History.

A timepiece with a nearly constant rate, intended primarily for the determination of longitude by comparing local time, computed by celestial or satellite navigation, with time at the prime...

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coastal Navigation

Overview page. Subjects: Maritime History.

The difference between coastal navigation and pilotage is narrow, but a general definition of the former would be the safe conduct of a ship where the navigator has the land on one side of...

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Decca

Overview page. Subjects: Maritime History.

A continuous-wave hyperbolic navigation system of high accuracy. It was first conceived in the USA in 1937 and further developed in the UK by the Decca Company with the Admiralty's Signal...

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fix

Overview page. Subjects: Maritime History.

The process of determining the position of a ship without reference to a previous position, from observations of landmarks or sea-marks, or by celestial, hyperbolic, or satellite...

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global Positioning System

Overview page. Subjects: Science and Mathematics.

A technology that works out a person's latitude and longitude based on triangulating their position using satellites and sends the data to a dedicated GPS unit or a portable device such as...

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hydrography

Overview page. Subjects: Maritime History.

N. the science that deals with the measurements and description of the physical features of the oceans, seas, lakes, rivers, and their adjoining coastal areas, with reference to their use...

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Inmarsat

Overview page. Subjects: Maritime History.

Abbreviation for the International Mobile Satellite Organization, which was formed by a convention of the International Maritime Organization in 1975, and began operations in 1982....

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marine and underwater archaeology

Overview page. Subjects: Maritime History.

Humankind's artefacts litter the seabed, partly as a result of mercantile and naval activities, but also because landscapes have become submerged. This submergence is not only the result of...

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radio beacon

Overview page. Subjects: Maritime History.

A land-based radio station which transmits characteristic medium-frequency radio signals the bearing of which can be measured from a ship fitted with a radio direction finder and so provide...

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