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A main product of the VORF project was the gridded vertical correction files which deliver the capability to transfer heights and depths from one vertical reference system to another, "allowing the direct use of depth data from surveys which is referred to a WGS84 compatible datum rather than Chart Datum and thus enabling Hydrographic surveyors to survey without the need to measure tides".
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.
Hydrographic officers who produce of nautical publications also provide a system to inform mariners of changes that effect the chart. In the US and the UK, corrections and notifications of new editions are provided by various governmental agencies by way of Notice to Mariners, Local Notice to Mariners, Summary of Corrections, and Broadcast ...
A prudent mariner should obtain a new chart if he has not kept track of corrections and his chart is more than several months old. Various Digital Notices to Mariners systems are available on the market such as Digitrace, Voyager, or ChartCo, to correct British Admiralty charts as well as NOAA charts. These systems provide only vessel relevant ...
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]
File:Admiralty Chart No 421 Montreal Harbour, Published 1961, Large Corrections 1967.jpg. ... from Scan of original Admiralty Chart with UploadWizard:
[4]: 115 The survey work was carried out in the summer and in the winter he would retire to Castle Frederick to complete his charts and drawings. His most notable work is the Atlantic Neptune. In 1774 under direction for the British Admiralty, DesBarres compiled and edited his and many others' charts and maps of eastern North America.
Admiralty Chart No 2182 The North Sea sheet II, surveyed by Captains Hewett and Washington. Washington's surveying career began in March 1841 with his first command, the paddle steamer HMS Shearwater. He took over the North Sea survey after the death of William Hewett, whose ship HMS Fairy was lost with all hands in a storm in 1840.
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