| 21. | In October 1948, Hydrographic Survey Group 1 arrived to help map the Persian Gulf's waters.
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| 22. | The United States Coast Guard also conducts hydrographic survey operations, particularly in the polar regions.
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| 23. | From 1904 it was based in Buenos Aires, mostly in support and hydrographic survey duties.
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| 24. | Isopach maps are utilized in hydrographic survey, stratigraphy, sedimentology, structural geology, petroleum geology and volcanology.
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| 25. | The rock was charted by a Royal Navy Hydrographic Survey Unit from HMS Protector, 1966-67.
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| 26. | It was charted by the Hydrographic Survey Unit from RRS " John Biscoe " in 1966.
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| 27. | She undertook hydrographic surveys around New Guinea with Captain Moresby and made a number of discoveries.
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| 28. | She commenced service on the Australia Station in 1880 as a survey vessel for hydrographic surveys.
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| 29. | This section specializes in reconnaissance and hydrographic survey.
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| 30. | The islands were more accurately charted by the British Royal Navy Hydrographic Survey Unit in 1963.
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