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United States Navy Hydrographic Office : ウィキペディア英語版
United States Hydrographic Office
The United States Hydrographic Office prepared and published maps, charts, and nautical books required in navigation.
The office was established by an act of 21 June 1866 as part of the Bureau of Navigation, Department of the Navy.
It was transferred to the Department of Defense on 10 August 1949.
The office was abolished on 10 July 1962, replaced by the Naval Oceanographic Office.
==Objectives==
Before the hydrographic office was established in 1866, U.S. navigators were almost entirely dependent on British charts. A few private enterprises had prepared and published charts, but had not been able to do so profitably.
The Hydrographic Office was established "for the improvement of the means for navigating safely the vessels of the Navy and of the mercantile marine, by providing, under the authority of the Secretary of the Navy, accurate and cheap nautical charts, sailing directions, navigators and manuals of instructions for the use of all vessels of the United States, and for the benefit and use of navigators generally".

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