| 41. | Triangulation and navigation bases were established along with tide gauges and then topographic and hydrographic surveys were begun.
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| 42. | The hydrographic survey ship Townsville for submerged debris, allowing the port to reopen three days after the cyclone.
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| 43. | A massive amount of data is collected during the typical hydrographic survey, often several soundings per square foot.
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| 44. | HMS " Hecate " was carrying out a hydrographic survey in collaboration with the government of the Republic.
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| 45. | The remaining four weeks involve the acquisition of various methods of conducting hydrographic surveys and creating a hydrographic chart.
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| 46. | The vessel was loaned to the Department of Mines and Technical Surveys for use as a hydrographic survey platform.
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| 47. | In 1963 the British Royal Navy Hydrographic Survey Unit found there were two islands, not one as previously supposed.
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| 48. | Charted during an ANARE ( Australian National Antarctic Research Expeditions ) ( Thala Dan ) hydrographic survey in 1961.
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| 49. | In 1895 it was reclassified as Aviso and remained in Patagonia on hydrographic survey tasks, based at Ushuaia.
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| 50. | The first naval hydrographic office was created in 1905 and its first mission was the hydrographic survey of Maliakos Gulf.
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