| 21. | In 1825 some 736 charts and coastal views were being offered for sale by the Hydrographic Office.
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| 22. | In 1935 the Ubek were replaced by hydrographic offices subordinate to the commander of the fleets and flotillas.
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| 23. | An amendment was made to the gazettal, and the Hydrographic Office began to remove the mark from charts.
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| 24. | The U . S . Navy Hydrographic Office was sending navigational warnings to ships at sea by 1907.
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| 25. | Richard Spratly was the name reported by Captain Doyle of Australia and Captain Campbell of the Hydrographic Office
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| 26. | In 1866, an Act of Congress separated the two functions, establishing the Hydrographic Office as a distinct activity.
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| 27. | In December 2006, HMNAO was transferred to the United Kingdom Hydrographic Office, which is based in Taunton in Somerset.
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| 28. | In Hawaii from July to September, she took soundings for the Hydrographic Office and participated in various local exercises.
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| 29. | There are also products known as Sailing Directions, which are books written by various Hydrographic Offices throughout the world.
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| 30. | She sailed on 3 November 1924 to survey in the Caribbean under the direction of the Navy Hydrographic Office.
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