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Over 60 countries which produce nautical charts also produce a notice to mariners. About one third of these are weekly, another third are bi-monthly or monthly, and the rest irregularly issued according to need. [citation needed] For example, the United Kingdom Hydrographic Office issues weekly updates. [4] [when?]
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. The initial remit was to organise the charts and information in the ...
These charts are considered "official" in contrast to those made by commercial publishers. Many hydrographic offices provide regular, sometimes weekly, manual updates of their charts through their sales agents. Individual hydrographic offices produce national chart series and international chart series.
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The SS United States could travel at a speed of 38.32 knots (44.1 mph), which still holds the record for ocean liners.
In the UK, the Admiralty issues 76 volumes covering the world and these are used frequently by most merchant ships. [8] In the US, the United States Coast Pilots is a nine-volume American navigation publication distributed yearly by the National Ocean Service. Its purpose is to supplement nautical charts of US waters.
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Admiralty List of Lights & Fog Signals vol. H: Northern and Eastern Coasts of Canada. The United Kingdom Hydrographic Office, generally known as "The Admiralty", publishes the Admiralty List of Lights and Fog Signals covering the whole world in 15 volumes. The information is also available in digital form. [4] [5]