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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. [5] [6] The UKHO light lists include some 85,000 light structures of significance for navigation ...
In addition to information on lighted aids to navigation and sound signals in foreign waters, the NGA List of Lights provides information on storm signals, signal stations, racons, radiobeacons, and radio direction finder calibration stations located at or near lights. Publication number 117, Radio Navigational Aids, is the primary source for ...
The NOTMAR web site also includes the historical Chart corrections and historical Sailing Direction corrections; as well, it provides access to downloadable Chart Patches, contains links to CHS’s Chart Number 1, instructions for applying Notices to mariners to manually update their paper charts, and other useful information. [citation needed]
In addition to traditional paper nautical charts and publications, the range has expanded to include a number of digital products and services. In 1996, the UKHO developed ADMIRALTY Raster Chart Service, a raster navigational chart service for Electronic Chart Display and Information System.
An example of a complete light characteristic is "Gp Oc(3) W 10s 15m 10M". This indicates that the light is a group occulting light in which a group of three eclipses repeat every 10 seconds; the light is white; the light is 15 metres above the chart datum and the nominal range is 10 nautical miles.
Initially charts were produced only for use by the Navy, but in 1821, Thomas Hurd, who had succeeded Dalrymple as Hydrographer in 1808, persuaded the Admiralty to allow sales to the public. [4]: 27 [5]: 105–106 The first catalogue of Admiralty charts was published in 1825, and listed 756 charts. [6]
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.
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