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An aquascope (also called bathyscope) is an underwater viewing device. It is used to view the underwater world often from dry land or a boat. It eliminates the water surface glare and allows viewing as far as water clarity and light permit. The underwater viewer can be used for observing reefs, checking boat moorings, secchi disks and other ...
An underwater survey is a survey performed in an underwater environment or conducted remotely on an underwater object or region. Survey can have several meanings. Survey can have several meanings. The word originates in Medieval Latin with meanings of looking over and detailed study of a subject . [ 1 ]
The National Association of Underwater Instructors (NAUI Worldwide) is a nonprofit association of scuba instructors founded in 1960 by Albert Tillman and Neal Hess. [ 2 ] [ 3 ] NAUI primarily serves as a recreational dive certification and membership organization, providing international diver standards and education programs.
As a result of the extensive studies of this group, the United States Secretary of the Navy in November 1959 directed establishment of the Atlantic Undersea Test and Evaluation Center (AUTEC) under the Bureau of Ships (now Naval Sea Systems Command) to provide a deep water test and evaluation facility for making underwater acoustic measurement ...
Underwater exploration is the exploration of any underwater environment, either by direct observation by the explorer, or by remote observation and measurement under the direction of the investigators. Systematic, targeted exploration is the most effective method to increase understanding of the ocean and other underwater regions, so they can ...
Nav finder and underwater compass – basic underwater navigation tools Suunto SK-7 diving compass in aftermarket wrist mount with bungee straps. Diver navigation, termed "underwater navigation" by scuba divers, [1] is a set of techniques—including observing natural features, the use of a compass, and surface observations—that divers use to navigate underwater.
In 1992 the National Association of Underwater Instructors (NAUI) became the first mainstream US agency to accept IANTD qualifications, and the Sub-Aqua Association (SAA) became the first UK agency to recognise IANTD certifications in 1993. In 2000, IANTD introduced a free-diver program prepared by Divetech Ltd of Grand Cayman. [3]
Elephant seals stay at sea for between 2 and 8 months and dive continuously, spending 90% of their time underwater and averaging 20 minutes per dive with less than 3 minutes at the surface between dives. Their maximum dive duration is about 2 hours and they routinely feed at depths between 300 and 600 m, though they can exceed depths of 1600 m.
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