A medieval chart that included directional information often drawn on animal hide. See rutter.
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IMPROVED CHANNELS
Dredged channels under the jurisdiction of the U.S Army Corps of Engineers, and maintained to provide an assigned CONTROLLING DEPTH. Symbolized on National Ocean Survey charts by black, broken lines to represent side limits, with the con- trolling depth and date of the survey given together with a tabulation of more detailed information
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INTERNATIONAL HYDROGRAPHIC BULLETIN
A publication, published monthly by the International Hydrographic Bureau for the International Hydrographic Organization, which contains information of current hydrographic interest.
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GLOBAL POSITIONING SYSTEM
A satellite based radionavigation system providing continuous worldwide coverage. It provides navigation, position, and timing information to air, marine, and land users.
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LIGHT LIST
A publication giving detailed information regarding lighted navigational aids and fog signals. In the United States, light lists are published by the U.S. Coast Guard as USCG Light Lists and by the National Imagery and Mapping Agency as List of Lights.
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LOCAL NOTICE TO MARINERS
A notice issued by each U.S. Coast Guard District to disseminate important information affecting navigational safety within the District. The Local Notice reports changes to and deficiencies in aids to navigation maintained by and under the authority of the U.S. Coast Guard. Other information includes channel depths, new charts, naval operations, regattas, etc. Since temporary information, known or expected to be of short duration, is not included in the weekly Notice to Mariners published by th
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LINE OF SOUNDINGS
A series of soundings obtained by a vessel underway, usually at regular intervals. In piloting, this information may be used to determine an estimated position, by recording the soundings at appropriate intervals (to the scale of the chart) along a line drawn on transparent paper or plastic, to represent the track, and then fitting the plot to the chart, by trial and error. A vessel obtaining soundings along a course line, for use in making or improving a chart, is said to run a line of soundings.
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DAYMARK
A signboard attached to a daybeacon to convey navigational information presenting one of several standard shapes (square, triangle, rectangle) and colors (red, green, orange, yellow, or black). Daymarks usually have reflective material indicating the shape, but may also be lighted.
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ELECTRONIC DATA INTERCHANGE
The exchange of information through an electronic format. Electronic commerce has been under intensive development in the transportation industry to achieve a competitive advantage in international markets. (EDI)
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EDI
The exchange of information through an electronic format. Electronic commerce has been under intensive development in the transportation industry to achieve a competitive advantage in international markets.
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AID TO NAVIGATION
A device or structure external to a craft, designed to assist in determination of position, to define a safe course, or to warn of dangers or obstructions. If the information is transmitted by light waves, the device is called a visual aid to navigation; if by sound waves, an audible aid to navigation; if by radio waves; a radio aid to navigation. Any aid to navigation using electronic equipment, whether or not radio waves are involved, may be called an elec- tronic aid to navigation. Compare with NAVIGATIONAL AID, meaning an instrument, device, chart, method, etc., intended to assist in the navigation of a craft.
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