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Irish Transverse Mercator

Irish Transverse Mercator is the geographic coordinate system for Ireland. It was implemented jointly by the Ordnance Survey Ireland and the Ordnance Survey of Northern Ireland in 2001. The name is derived from the Transverse Mercator projection ...

Isoazimuth

The isoazimuth is the locus of the points on the Earths surface whose initial orthodromic course with respect to a fixed point is constant. That is, if the initial orthodromic course Z from the starting point S to the fixed point X is 80 degrees, ...

Knot (unit)

The knot is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h. The ISO standard symbol for the knot is kn. The same symbol is preferred by the Institute of Electrical and Electronics Engineers ; kt is also common, especially ...

Lanby buoy

Lanby buoy is a contraction of Large Automatic Navigation BuoY. Lanby buoys were first made in the USA by General Dynamics and adapted by Hawker Siddeley Dynamics for use in British waters in the early 1970s. The buoys were intended to replace li ...

Land navigation

Land navigation is the discipline of following a route through unfamiliar terrain on foot or by vehicle, using maps with reference to terrain, a compass, and other navigational tools. It is distinguished from travel by traditional groups, such as ...

Landmark

A landmark is a recognizable natural or artificial feature used for navigation, a feature that stands out from its near environment and is often visible from long distances. In modern use, the term can also be applied to smaller structures or fea ...

Sea lane

A sea lane, sea road or shipping lane is a regularly used route for vessels on oceans and large lakes. In the Age of Sail they were not only determined by the distribution of land masses but also the prevailing winds, whose discovery was crucial ...

Latitude

In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earths surface. Latitude is an angle which ranges from 0° at the Equator to 90° at the poles. Lines of constant latitude, or parallels, ru ...

Lee shore

In seamanship, lee shore, sometimes also called leeward and ward shore, is a stretch of shoreline that is to the lee side of a vessel - meaning the wind is blowing towards it. A weather shore has the wind blowing from inland over it out to sea. F ...

Light characteristic

A light characteristic is a graphic and text description of a navigational light sequence or colour displayed on a nautical chart or in a Light List with the chart symbol for a lighthouse, lightvessel, buoy or sea mark with a light on it. The gra ...

Light dues

Light dues are levied on commercial vessels and larger pleasure boats calling at ports in the British Isles and paid into the General Lighthouse Fund GLF, which is under the stewardship of the UKs Department for Transport and is used to finance t ...

Line marker

In cave diving, line markers are used for orientation as a visual and tactile reference on a permanent guideline. Directional markers, are also known as line arrows or Dorff arrows, and point the way to an exit. Line arrows may mark the location ...

List of traffic separation schemes

A traffic separation scheme is an area in the sea where navigation of ships is highly regulated. Each TSS is designed to create lanes in the water with ships in a specific lane all travelling in the same direction. A TSS is typically created in l ...

Local Notice to Mariners

LNTMs are, by definition, concerned with local issues. Each issuing authority has its own series of LNTMs – there is no international standard numbering or indexing scheme. Individual LNTMs may concern short or long term situations. At Portsmouth ...

Logbook

A logbook is a record of important events in the management, operation, and navigation of a ship. It is essential to traditional navigation, and must be filled in at least daily. The term originally referred to a book for recording readings from ...

Long baseline acoustic positioning system

A long baseline acoustic positioning system is one of three broad classes of underwater acoustic positioning systems that are used to track underwater vehicles and divers. The other two classes are ultra short baseline systems and short baseline ...

Longitude

Longitude, is a geographic coordinate that specifies the east–west position of a point on the Earths surface, or the surface of a celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda. M ...

Longitude by chronometer

Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during the first half of the eighteenth century. It is an astronomical method of calculating the longit ...

Loxodromic navigation

Loxodromic navigation is a method of navigation by following a rhumb line, a curve on the surface of the Earth that follows the same angle at the intersection with each meridian. This serves to maintain a steady course in sailing. Navigating on a ...

LRK

Long Range Kinematic technology is a sophisticated kinematic method developed by Magellan Navigation that optimises the advantages of dual-frequency GPS operation. Other conventional methods use the dual-frequency only during initialisation. LRK ...

Lubber line

A lubber line is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft and corresponding to the crafts centerline. The line represents 0 degrees and is therefore the zero-po ...

Lunar distance method

In celestial navigation, lunar distance is the angular distance between the Moon and another celestial body. The lunar distances method uses this angle, also called a lunar, and a nautical almanac to calculate Greenwich time. That calculated time ...

Magnetic deviation

Magnetic deviation is the error induced in a compass by local magnetic fields, which must be allowed for, along with magnetic declination, if accurate bearings are to be calculated.

Maneuvering board

A maneuvering board is an aid to navigation. It is typically a writing surface with a pre-printed compass rose of polar coordinates about a central point, often including adjacent linear scales, and sometimes a time/speed/distance nomogram. With ...

Maritime pilot

A maritime pilot, marine pilot, harbor pilot, bar pilot, or simply pilot, is a sailor who maneuvers ships through dangerous or congested waters, such as harbors or river mouths. They are navigational experts possessing knowledge of the particular ...

List of Members of the International Hydrographic Organization

As of October 2019, the International Hydrographic Organization comprises 93 Member States, four of which are suspended because of their lapsed annual financial contribution. The IHO identifies its representative member organisations as the respe ...

Meridian altitude

Meridian altitude is a method of celestial navigation to calculate an observers latitude. It notes the angular height of an astronomical object above the horizon at culmination.

Nautical mile

A nautical mile is a unit of measurement used in both air and marine navigation, and for the definition of territorial waters. Historically, it was defined as one minute of latitude along any line of longitude. Today the international nautical mi ...

Fisheries monitoring control and surveillance

Monitoring, control and surveillance, in the context of fisheries, is defined by the Food and Agriculture Organization of the United Nations as a broadening of traditional enforcing national rules over fishing, to the support of the broader probl ...

Munzee

Munzee is a freemium scavenger hunt game where QR codes have to be found at different places in the real world. The game is similar to geocaching but uses QR code technology, in addition to device GPS location, to prove the find instead of a logb ...

N-vector

The n -vector representation is a three-parameter non-singular representation well-suited for replacing latitude and longitude as horizontal position representation in mathematical calculations and computer algorithms. Geometrically, the n -vecto ...

Naismith's rule

Naismiths rule helps with the planning of a walking or hiking expedition by calculating how long it will take to travel the intended route, including any extra time taken when walking uphill. This rule of thumb was devised by William W. Naismith, ...

Nautical measured mile

A nautical measured mile is a nautical mile which is marked by two pairs of towers. A mile is measure by sailing on a given bearing and lining up the pairs of towers. The start of the mile is recorded when the first pair of towers line up and the ...

Nautical publications

Nautical publications is a technical term used in maritime circles describing a set of publications, either published by national governments or by commercial and professional organisations, for use in safe navigation of ships, boats, and similar ...

Nautical stationkeeping

Station-keeping in a nautical situation is when a vessel is to: part of a task force or convoy conducting underway replenishment or maintain a position in relation to another moving vessel or vessels, such as when patrolling a defined sector in r ...

NAVAREA

NAVAREAs are the maritime geographic areas in which various governments are responsible for navigation and weather warnings. NAVAREAs are mentioned in International Maritime Organization Assembly Resolution A.70617 adopted 6 November 1991. The In ...

Navigation research

Whereas originally the term Navigation applies to the process of directing a ship to a destination, Navigation research deals with fundamental aspects of navigation in general. It can be defined as "The process of determining and maintaining a co ...

Navigation system

A navigation system is a system that aids in navigation. Navigation systems may be entirely on board a vehicle or vessel bridge, or they may be located elsewhere and communicate via radio or other signals with a vehicle or vessel, or they may use ...

Navigational aid

A navigational aid, also known as aid to navigation, is any sort of marker which aids the traveler in navigation, usually nautical or aviation travel. Common types of such aids include lighthouses, buoys, fog signals, and day beacons.

Navigational algorithms

Navigational Algorithms is a web site whose purpose is to make available the scientific part of the art of navigation, containing specialized articles and software that implements the various procedures of calculus. The topics covered are: Coasta ...

Navigational instrument

Navigational instruments refers to the instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction etc. to arrive at the port or ...

List of selected stars for navigation

Fifty-eight selected navigational stars are given a special status in the field of celestial navigation. Of the approximately 6.000 stars visible to the naked eye under optimal conditions, the selected stars are among the brightest and span 38 co ...

Navigational triangle

The navigational triangle or PZX triangle is a term used in Astro-Navigation, or Celestial Navigation, and its solution can give you your position anywhere on the globe. The sky is described as a Celestial Sphere with a North and South Pole corre ...

NavPix

NavPix is the proprietary name applied by Navman to its technology that combines an image with geographical data. The "NavPix" name is used for both the software and the geo-referenced image that results from that software.

North Atlantic Track Agreement

The North Atlantic Track Agreement was an agreement in November 1898 among thirteen passenger steamship companies to use a set series of trans-Atlantic routes that stretched from the northeast of North America to western Europe for the Atlantic c ...

North Pole

The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is defined as the point in the Northern Hemisphere where the Earths axis of rotation meets its surface. The North Pole is the northernmost point on the Earth, lyin ...

Northeast Passage

The Northeast Passage is, from the European and northern Atlantic point of view, the shipping route to the Pacific Ocean, along the Arctic coasts of Norway and Russia. The western route through the islands of Canada is accordingly called the Nort ...

Northern Sea Route

The Northern Sea Route is a shipping route officially defined by Russian legislation as lying east of Novaya Zemlya and specifically running along the Russian Arctic coast from the Kara Sea, along Siberia, to the Bering Strait. The entire route l ...

Notice to mariners

A notice to mariners 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 chart ...

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