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In navigation, bearing or azimuth is the horizontal angle between the direction of an object and north or another object. The angle value can be specified in various angular units, such as degrees, mils, or grad. More specifically:
A projected coordinate system – also called a projected coordinate reference system, planar coordinate system, or grid reference system – is a type of spatial reference system that represents locations on Earth using Cartesian coordinates (x, y) on a planar surface created by a particular map projection. Each projected coordinate system, such as "Universal Transverse Mercator WGS 84 Zone 26N," is defined by a choice of map projection (with specific parameters), a choice of geodetic datum to bind the coordinate system to real locations on the earth, an origin point, and a choice of unit of measure. Hundreds of projected coordinate systems have been specified for various purposes in various regions.
The Ordnance Survey National Grid reference system (OSGB), also known as British National Grid (BNG), is a system of geographic grid references used in Great Britain, distinct from latitude and longitude.
The Irish grid reference system is a system of geographic grid references used for paper mapping in Ireland. The Irish grid partially overlaps the British grid, and uses a similar co-ordinate system but with a meridian more suited to its westerly location.
The Military Grid Reference System (MGRS) is the geocoordinate standard used by NATO militaries for locating points on Earth. The MGRS is derived from the Universal Transverse Mercator (UTM) grid system and the Universal Polar Stereographic (UPS) grid system, but uses a different labeling convention. The MGRS is used as geocode for the entire Earth.
Savernake Forest stands on a Cretaceous chalk plateau between Marlborough and Great Bedwyn in Wiltshire, England. Its area is approximately 4,500 acres.
The Stour Valley Walk is a recreational walking route that follows the River Stour, through the Low Weald and Kent Downs, from its source at Lenham to its estuary at Pegwell Bay.
Milecastle 50 (High House) was a milecastle on Hadrian's Wall (grid reference NY60676601).
Eilean Ornsay is a rocky and uninhabited island located off the south-western coast of the Inner Hebridean island of Coll. It is situated on the western side of Loch Eatharna and is joined to Coll at low tide. Evidence of the dun and other archaeological finds were recently discovered by a field walk on the east side of Coll.
The Western Rocks are a group of uninhabited skerries and rocks in the south–western part of the Isles of Scilly, United Kingdom, and are renowned for the numerous shipwrecks in the area and the nearby Bishop Rock lighthouse. In 1971, the rocks and islands were designated a Site of Special Scientific Interest for their breeding sea birds. Landing on the islands is both difficult and discouraged and there are few published records of visits by naturalists.
Milecastle 71 (Wormanby) was one of a series of Milecastles or small fortlets built at intervals of approximately one Roman mile along Hadrian's Wall (grid reference NY33805920).
Milecastle 47 (Chapel House) was a milecastle on Hadrian's Wall (grid reference NY64906607).
Frankenbury Camp is the site of an Iron Age univallate hillfort located in Hampshire. The site is on a very slight promontory overlooking the Avon Valley on the north-western edge of the New Forest. The fort encloses approximately 11 acres. It has very steep natural slopes on the west and south sides. The northeast sides are defended by a simple rampart and ditch. The original entrance on the southeast corner has since been widened. It is listed as a scheduled ancient monument no.122. The site is currently pasture, and part of Folds Farm, for the most part, although the earthworks themselves are lined with trees and the south and western parts are now encroached by woodland. Various archaeological relics have been found in the area:
Milefortlet 3 (Pasture House) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground but Milefortlet 3 has been located on aerial photographs.
Milecastle 57 (Cambeckhill) was a milecastle on Hadrian's Wall (grid reference NY50816368).
Milecastle 58 (Newtown) was a milecastle on Hadrian's Wall (grid reference NY49786258).
Milecastle 63 (Walby West) was a milecastle on Hadrian's Wall (grid reference NY43155973).
Milecastle 65 (Tarraby) was a milecastle on Hadrian's Wall (grid reference NY40855793).
Milecastle 68 (Boomby Gill) is a conjectured milecastle of the Roman Hadrian's Wall. The site of the milecastle (adjacent to Boomby Gill) has been calculated from measurement to known milecastle sites, but no remains providing proof of its existence have been identified.
Milecastle 69 (Sourmilk Bridge) was one of a series of Milecastles or small fortlets built at intervals of approximately one Roman mile along Hadrian's Wall (grid reference NY36575811).