HMS Sarepta

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Coordinates: 50°34′08″N2°27′02″W / 50.56889°N 2.45056°W / 50.56889; -2.45056

Geographic coordinate system Coordinate system

A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are often chosen such that one of the numbers represents a vertical position and two or three of the numbers represent a horizontal position; alternatively, a geographic position may be expressed in a combined three-dimensional Cartesian vector. A common choice of coordinates is latitude, longitude and elevation. To specify a location on a plane requires a map projection.

RNAS Portland was an air station of the Royal Navy from 1917.

Royal Navy Maritime warfare branch of the United Kingdoms military

The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by the English kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years War against the Kingdom of France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK's armed services, it is known as the Senior Service.

The site was first built in 1917 as HMS Sarepta within the confines of Portland Harbour as a seaplane base; the aircraft operating from the base's slipways.

Portland Harbour Harbour beside the Isle of Portland, off Dorset

Portland Harbour is located beside the Isle of Portland, Dorset, on the south coast of England. When completed in 1872, its 520-hectare (1,300-acre) surface area made it the largest man-made harbour in the world, and it is the third largest as of 2016, after the 4,500-hectare (11,000-acre) Ras Laffan Harbour in Qatar and the 1,500-hectare (3,700-acre) Cherbourg Harbour in France. It is naturally protected by Portland to the south, Chesil Beach to the west and mainland Dorset to the north. It consists of four breakwaters — two southern and two northern. These have a total length of 4.57 km and enclose approximately 520 hectares of water. The initial southern breakwaters were built between 1849 and 1872, and Portland Harbour was a Royal Navy base until 1995.

In 1959 it became RNAS Portland (HMS Osprey)

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