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[4]: 27 [5]: 105–106 The first catalogue of Admiralty charts was published in 1825, and listed 756 charts. [6] Admiralty Chart of the coast of Peru, surveyed by Robert FitzRoy in 1836, engraved in 1840, and published with corrections to 1960. Charts were printed from copper plates. Plates were engraved, in reverse, with a burin.
This image or file is a work of a Federal Aviation Administration employee, taken or made as part of that person's official duties. As a work of the U.S. federal government , the image is in the public domain in the United States.
The raster file also contains data that is Geo-referencing; enabling computer based navigation attached to a GPS to locate and display the chart. The charts are stored in BSB format. "[The BSB file format] is a proprietary format of BSB Electronic Charts, LLP (bought by MapTech, Inc.)."
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It is the responsibility of users to decide which of their charts and publications require correction. Mariners are requested to cooperate in the correction of charts and publications by reporting all discrepancies between published information and conditions actually observed and by recommending appropriate improvements.
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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