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Radio Navigational Aids
The ''Radio Navigational Aids'' (Publication 117) publication contains a detailed list of selected worldwide radio stations that provide services to the mariner.National Geospatial Intelligence Agency, 2008. The publication is divided into chapters according to the nature of the service provided by the radio stations. The services include Radio direction finder and Radar Stations; stations broadcasting navigational warnings, time signals or medical advice; communication traffic for distress, emergency and safety including the Global Maritime Distress Safety System (GMDSS) and long range navigational aids. It also contains chapters describing procedures of the AMVER System, and the interim emergency procedures and communication instructions to be followed by U.S merchant vessels in times of crisis. A new edition of Publication 117 is published annually. This publication is available in its entirety on the website and there are also database queries available for much of the data co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Lights
A list of lights is a publication describing lighthouses and other aids to maritime navigation. Most such lists are published by national hydrographic offices. Some nations, including the United Kingdom and the United States, publish lists that cover the whole world in many volumes. Other nations publish lists that cover only their own coasts. Canada The Canadian Coast Guard publishes the ''List of Lights, Buoys and Fog Signals'' in four volumes which are updated periodically * Newfoundland and Labrador *Inland Waters *Atlantic Coast * Pacific Coast The books are available in paper from dealers. As well, HTML and PDF formats updated up to the latest version of the Monthly Notices to Mariners can be viewed online. The PDF format is also available for free download. Chile The Chilean official list of lighthouses is the ''Lista de Faros de la costa de Chile, Costa Oriental de Tierra del Fuego y Territorio Antártico'' published (as Nr. 3007) by the Hydrographic and Oceanogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navigation
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating the navigator's position compared to known locations or patterns. Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and direction. In this sense, navigation includes orienteering and pedestrian navigation. History In the European medieval period, navigation was considered part of the set of '' seven mechanical arts'', none of which were used for long voyages across open ocean. Polynesian navigation is probably the earliest form of open-ocean navigation; it w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nathaniel Bowditch
Nathaniel Bowditch (March 26, 1773 – March 16, 1838) was an early American mathematician remembered for his work on ocean navigation. He is often credited as the founder of modern maritime navigation; his book '' The New American Practical Navigator'', first published in 1802, is still carried on board every commissioned U.S. Naval vessel. In 2001, an elementary and middle school in Salem was named in his honor. Life and work Nathaniel Bowditch, the fourth of seven children, was born in Salem, Province of Massachusetts Bay, to Habakkuk Bowditch, a cooper who at one point was a sailor as well but stopped after his ship went aground in 1775, and Mary Ingersoll Bowditch. At the age of ten, he was made to leave school to work in his father's cooperage, before becoming indentured at twelve for nine years as a bookkeeping apprentice to a ship chandler. Here is where he first learned bookkeeping, an important step in his life. In 1786, age fourteen, Bowditch began to study algeb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Imagery And Mapping Agency
The National Geospatial-Intelligence Agency (NGA) is a combat support agency within the United States Department of Defense whose primary mission is collecting, analyzing, and distributing geospatial intelligence (GEOINT) in support of national security. Initially known as the National Imagery and Mapping Agency (NIMA) from 1996 to 2003, it is a member of the United States Intelligence Community. NGA headquarters, also known as NGA Campus East or NCE, is located at Fort Belvoir North Area in Springfield, Virginia. The agency also operates major facilities in the St. Louis, Missouri area (referred to as NGA Campus West or NCW), as well as support and liaison offices worldwide. The NGA headquarters, at , is the third-largest government building in the Washington metropolitan area after The Pentagon and the Ronald Reagan Building. In addition to using GEOINT for U.S. military and intelligence efforts, NGA provides assistance during natural and man-made disasters, aids in secur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Navigation
Radio navigation or radionavigation is the application of radio frequencies to determine a position of an object on the Earth, either the vessel or an obstruction. Like radiolocation, it is a type of radiodetermination. The basic principles are measurements from/to electric beacons, especially * Angular directions, e.g. by bearing, radio phases or interferometry, * Distances, e.g. ranging by measurement of time of flight between one transmitter and multiple receivers or vice versa, * Distance ''differences'' by measurement of times of arrival of signals from one transmitter to multiple receivers or vice versa * Partly also velocity, e.g. by means of radio Doppler shift. Combinations of these measurement principles also are important—e.g., many radars measure range and azimuth of a target. Bearing-measurement systems These systems used some form of directional radio antenna to determine the location of a broadcast station on the ground. Conventional navigation technique ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Notice To Mariners
A notice to mariners (NTM or NOTMAR,) advises mariners of important matters affecting navigational safety, including new hydrographic information, changes in channels and aids to navigation, and other important data. Over 60 countries which produce nautical charts also produce a notice to mariners. About one third of these are weekly, another third are bi-monthly or monthly, and the rest irregularly issued according to need. For example, the United Kingdom Hydrographic Office issues weekly updates. United States The U.S. ''Notice to Mariners'' is made available weekly by the National Geospatial-Intelligence Agency (NGA), prepared jointly with the National Ocean Service (NOS) and the U.S. Coast Guard. The information in the ''Notice to Mariners'' is formatted to simplify the correction of paper charts, '' List of Lights'', '' Light Lists'', '' United States Coast Pilots'', and other publications produced by NGA, NOS, and the U.S. Coast Guard. Information for the ''Notice to M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local Notice To Mariners
A Local Notice to Mariners is an authoritative instruction issued by a designated official, typically the harbormaster. United States In the United States, notices are issued by each U.S. Coast Guard District to disseminate important information affecting navigational safety within that District. This Notice reports changes and deficiencies in aids to navigation maintained by the Coast Guard. Other marine information such as new charts, channel depths, naval operations, and regattas is included. Since temporary information of short duration is not included in the weekly Notice to Mariners, the ''Local Notice to Mariners'' may be the only source of such information. Small craft using the Intracoastal Waterway and small harbors not normally used by oceangoing vessels need it to keep charts and publications up-to-date. Since correcting information for U.S. charts in the ''Notice to Mariners'' is obtained from the Coast Guard Local Notices, it is normal to expect a lag of 1 or 2 week ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light List
A list of lights is a publication describing lighthouses and other aids to maritime navigation. Most such lists are published by national hydrographic offices. Some nations, including the United Kingdom and the United States, publish lists that cover the whole world in many volumes. Other nations publish lists that cover only their own coasts. Canada The Canadian Coast Guard publishes the ''List of Lights, Buoys and Fog Signals'' in four volumes which are updated periodically *Newfoundland and Labrador *Inland Waters *Atlantic Coast *Pacific Coast The books are available in paper from dealers. As well, HTML and PDF formats updated up to the latest version of the Monthly Notices to Mariners can be viewed online. The PDF format is also available for free download. Chile The Chilean official list of lighthouses is the ''Lista de Faros de la costa de Chile, Costa Oriental de Tierra del Fuego y Territorio Antártico'' published (as Nr. 3007) by the Hydrographic and Oceanographic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Direction Finder
Direction finding (DF), or radio direction finding (RDF), isin accordance with International Telecommunication Union (ITU)defined as radio location that uses the reception of radio waves to determine the direction in which a radio station or an object is located. This can refer to radio or other forms of wireless communication, including radar signals detection and monitoring (ELINT/ESM). By combining the direction information from two or more suitably spaced receivers (or a single mobile receiver), the source of a transmission may be located via triangulation. Radio direction finding is used in the navigation of ships and aircraft, to locate emergency transmitters for search and rescue, for tracking wildlife, and to locate illegal or interfering transmitters. RDF was important in combating German threats during both the World War II Battle of Britain and the long running Battle of the Atlantic. In the former, the Air Ministry also used RDF to locate its own fighter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coast Pilots
''United States Coast Pilot'' is a ten-volume American navigation publication distributed yearly by the Office of Coast Survey, a part of the National Oceanic and Atmospheric Administration's National Ocean Service. The purpose of the publication is to supplement nautical charts of the waters of the United States. Contents Each volume of the ''United States Coast Pilot'' contains comprehensive sections on local operational considerations and navigation regulations, with later chapters containing detailed discussions of coastal navigation; an appendix provides information on obtaining additional weather information, communications services, and other data. An index and additional tables complete the volume.Text from the ''American Practical Navigator'', Section 405, produced by the United States Government. Information comes from field inspections, survey vessels, and various harbor authorities. Maritime officials and pilotage associations provide additional information. Each vol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
