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IHO Publication S-49 provides a standardized structure for the preparation and publication of Mariners‘ Routeing Guides. The updated text of this document (S-49) was prepared by the IHO Nautical Information Provision Working Group (NIPWG) in 2019.
The great circle is the shortest distance between the two points along the surface of the spherical earth. Notice that th e intersection between the plane and the earth goes considerably north (pole ward) of the constant latitude path. At the maximum the difference in the two paths is about 350 km.
A sea mile is the length of one minute of latitude locally, and is the principal means of expressing distance on Admiralty char ts. A cable is one-tenth of a sea mile. Names on Admiralty charts are spelt in accordance with the principles and systems approved by the Permanent Committee on
Written by David Stephens, this guide offers an overview of the history of maps and how historians use them, a breakdown of the elements of a map, tips on what questions to ask when analyzing maps, an annotated bibliography, and a guide to finding and using maps online.
ADMIRALTY Routeing Charts provide shipping routes and distances between major ports and important information on seasonal changes, detailing expected weather and ocean conditions for each month of the year.
Find local businesses, view maps and get driving directions in Google Maps.
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