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The British admiralty charts are compiled, drawn and issued by the Hydrographic Office. This department of the Admiralty was established under Earl Spencer by an order in council in 1795, consisting of the Hydrographer, Alexander Dalrymple, one assistant and a draughtsman.
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.
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
The Admiralty's first Hydrographer was Alexander Dalrymple, [2] appointed in 1795 on the order of King George III and the existing charts were brought together and catalogued. The first chart Dalrymple published as Hydrographer to the Admiralty (of Quiberon Bay in Brittany) did not appear until 1800. [3]
The Admiralty appointed Alexander Dalrymple as hydrographer on 12 August 1795, with a remit to gather and distribute charts to HM Ships. Within a year existing charts had been collated, and the first catalogue published. It was five years before the first chart—of Quiberon Bay in Brittany—was produced by the Hydrographer. [1]
The List of Lights is published in seven volumes, as Publication numbers 110 through 116. Each volume contains lights and other aids to navigation that are maintained by or under the authority of other governments. In the UK, the UKHO List of Lights and Fog Signals, and the Admiralty List of Radio signals are split into separate volumes.
UK Admiralty Tidal Atlases show speed in units of tenth of a knot. Two figures are given separated by a comma, the first is the mean neap rate and the second the mean spring rate. The dot of the comma indicates where the observations were made. [ 1 ]
Admiralty in the 16th century - the Admiralty and Marine Affairs Office (1546-1707) Admiralty (United Kingdom), a former military department in command of the Royal Navy from 1707 to 1964; Admiralty Board (United Kingdom), the post-1964 board responsible for the Royal Navy; Board of Admiralty, the board responsible for the Royal Navy from 1628 ...