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''Retired Canadian Hydrographic Service logo or crest'' The Canadian Hydrographic Service (CHS) is Canada's hydrographic office, with responsibility for performing hydrographic surveys and publishing paper and electronic nautical charts. CHS also represents Canada in the International Hydrographic Organization. ==History== Prior to Confederation, responsibilities for hydrographic survey and chart production in British North America rested with the Royal Navy. In 1882, the loss of the steamship ''SS Asia'' on an uncharted shoal in Georgian Bay resulted in 150 fatalities and was Canada's worst maritime disaster at the time. On August 13, 1883, the Dominion government established the Georgian Bay Survey which was empowered by legislation with the responsibility to survey and chart navigable waters of Georgian Bay and Lake Huron. Surveying and charting was extended to Canada's Pacific coast in 1891, tidal and current metering nationwide began in 1893, surveying and charting extended to the Maritimes by 1905, and water level gauging of the Great Lakes began in 1912.〔 In 1904, a Privy Council order renamed the Georgian Bay Survey to the Hydrographic Survey of Canada with some modified responsibilities. In 1913 one of Canada's most famous hydrographic survey vessels, CSS ''Acadia'' was commissioned for use on the Atlantic coast. In 1928, the organization was renamed to the current name Canadian Hydrographic Service. Responsibility was extended on March 31, 1949 with the entry of Newfoundland into Confederation, with CHS taking over surveys and charting around the island of Newfoundland and the coast of Labrador from the Royal Navy.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canadian Hydrographic Service」の詳細全文を読む スポンサード リンク
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