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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 ...
Long baseline systems get their name from the fact that the spacing of the baseline transponders is long or similar to the distance between the diver or vehicle and the transponders. [3] That is, the baseline transponders are typically mounted in the corners of an underwater work site within which the vehicle or diver operates.
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 ...
The publication of the first US Navy Diving Manual [4] in 1916 and the establishment of a Navy Diving School at Newport, Rhode Island were the direct outgrowth of experience gained in the test program and the USS F-4 salvage. When the United States entered World War I, the staff and graduates of the school were sent to Europe, where they ...
USBL (ultra-short baseline, also known as SSBL for super short base line) is a method of underwater acoustic positioning. A USBL system consists of a transceiver, which is mounted on a pole under a ship, and a transponder or responder on the seafloor, on a towfish, or on an ROV. A computer, or "topside unit", is used to calculate a position ...
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]
3.20 m (10 ft 6 in) Height: 3.35 m (11 ft 0 in) Propulsion: 2 × side-mounted reversible thrusters tiltable through 90 degree, 2 × lead-acid battery systems: 120 V DC at 330 Ah capacity and 12–24 V DC at 220 Ah capacity: Speed: 2.0 knots: Range: 7–10 hours operational time: Endurance: 140 hours life support for 3 people: Test depth: 2,000 ...
The Aquarius Reef Base is an underwater habitat located 5.4 mi (8.7 km) off Key Largo in the Florida Keys National Marine Sanctuary, Florida, United States.It is the world's only undersea research laboratory and it is operated by Florida International University.