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. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation.
Piloting or pilotage is navigating, using fixed points of reference on the sea or on land, usually with reference to a nautical chart or aeronautical chart to obtain a fix of the position of the vessel or aircraft with respect to a desired course or location. Horizontal fixes of position from known reference points may be obtained by sight or by radar. Vertical position may be obtained by depth sounder to determine depth of the water body below a vessel or by altimeter to determine an aircraft's altitude, from which its distance above the ground can be deduced. Piloting a vessel is usually practiced close to shore or on inland waterways. Pilotage of an aircraft is practiced under visual meteorological conditions for flight.
In meteorology, Buys Ballot's law may be expressed as follows: In the Northern Hemisphere, if a person stands with his back to the wind, the atmospheric pressure is low to the left, high to the right. This is because wind travels counterclockwise around low pressure zones in the Northern Hemisphere. It is approximately true in the higher latitudes of the Northern Hemisphere, and is reversed in the Southern Hemisphere, but the angle between the pressure gradient force and wind is not a right angle in low latitudes.
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 if so desired, or by extension any other time. That calculated time can be used in solving a spherical triangle. The theory was first published by Johannes Werner in 1524, before the necessary almanacs had been published. A fuller method was published in 1763 and used until about 1850 when it was superseded by the marine chronometer. A similar method uses the positions of the Galilean moons of Jupiter.
The American Practical Navigator, originally written by Nathaniel Bowditch, is an encyclopedia of navigation. It serves as a valuable handbook on oceanography and meteorology, and contains useful tables and a maritime glossary. In 1867 the copyright and plates were bought by the Hydrographic Office of the United States Navy. As of 2019 it is still published by the U.S. Government and is available free online from the National Geospatial-Intelligence Agency (NGA), the modern successor agency to the 19th Century Hydrographic Office. The publication is considered one of America's nautical institutions.
Sailing Directions are written directions that describe the routes to be taken by boats and ships during coastal navigation and port approaches. There are also products known as Sailing Directions, which are books written by various Hydrographic Offices throughout the world. They are known as Pilot Books, because they provide local knowledge of routes and landmarks, which would typically be provided by a local marine pilot. As such, they are used frequently by naval and government vessels, who are exempted from 'Compulsory Pilotage' in many ports.
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.
A Local Notice to Mariners is an authoritative instruction issued by a designated official, typically the harbormaster.
United States Coast Pilot is a nine-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.
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 vessels. Other publications might cover topics such as seamanship and cargo operations. In the UK, the United Kingdom Hydrographic Office, the Witherby Publishing Group and the Nautical Institute provide numerous navigational publications, including charts, publications on how to navigate and passage planning publications. In the US, publications are issued by the US government and US Coast Guard.
HMS Eclipse was a Royal Navy Cruizer-class brig-sloop built by John King at Dover and launched in 1807. She served off Portugal and then in the Indian Ocean at the capture of the Île de France. Shortly thereafter she captured Tamatave. She was sold for mercantile service in 1815. She traded with India until 1823. Then between 1823 and 1845 she made seven voyages as a whaler.
Rainbow, launched in New York in 1845 to sail in the China trade for the firm Howland & Aspinwall, was the first extreme clipper, a type of clipper ship designed to sacrifice cargo capacity for speed.
A rutter is a mariner's handbook of written sailing directions. Before the advent of nautical charts, rutters were the primary store of geographic information for maritime navigation.
Rumble is a skerry in the Shetland islands of Scotland, situated roughly 4 kilometres (2.5 mi) east off the coast of Huxter, southeastern Whalsay. It lies 0.75 miles (1.21 km) to southwest of East Linga. The main island, also known as Rumble Holm, is 27 feet (8.2 m) high. Nearby and to the north are the Flaeshans of Rumble, a series of small islets and stacks and Burlastack of Rumble lies to the east. On the northern side of the main island is an inlet, known as the Voe of Rumble. Lobsters and prawns are said to shelter here. It is also mentioned that a ship named Griften of unknown nationality was shipwrecked either here or on the Holm of Sandwick in 1611.
Hugh Murray FRSE FRGS (1779–1846) was a Scottish geographer and author. He is often referred to as Hew Murray.
An azimuth compass is a nautical instrument used to measure the magnetic azimuth, the angle of the arc on the horizon between the direction of the sun or some other celestial object and the magnetic north. This can be compared to the true azimuth obtained by astronomical observation to determine the magnetic declination, the amount by which the reading of a ship's compass must be adjusted to obtain an accurate reading. Azimuth compasses were important in the period before development of the reliable chronometers needed to determine a vessel's exact position from astronomical observations.
Pakefield Lighthouse is a decommissioned 19th century lighthouse which was built near Pakefield a suburb of Lowestoft in Suffolk. The lighthouse tower has been used for a variety of maritime, civilian and military roles, and is currently used as a Coastwatch lookout post.
John Seller (1632–1697) was an English compiler, publisher, and seller of maps, charts, and geographical books. From 1671 he was hydrographer to the King.
Scarborough Pier Lighthouse is an active aid to navigation on Vincent Pier in Scarborough, North Yorkshire, owned and operated by Scarborough Borough Council. The lighthouse dates from 1806, but it had to be rebuilt following damage sustained in the German bombardment of 1914.
