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Imaginary "Mail buoys" have been used as a prank in the US Navy when a new sailor may be given the task of locating one to retrieve non-existent mail. [22] Space buoys, a feature in some science fiction stories which are stationary objects in outer space that provide navigation data or warnings. [citation needed]
Mooring as deployed in Fram Strait with top buoy, a CTD-sensor, two rotor current meters, acoustic release and train wheels as anchor. A mooring in oceanography is a collection of devices connected to a wire and anchored on the sea floor. It is the Eulerian way of measuring ocean currents, since a mooring is
Mooring involves (a) beaching the boat, (b) drawing in the mooring point on the line (where the marker buoy is located), (c) attaching to the mooring line to the boat, and (d) then pulling the boat out and away from the beach so that it can be accessed at all tides.
Examples of Special Marks A Special mark indicating an outfall pipe in the Irish Sea off Helen's Bay, Northern Ireland.It has the flashing sequence Fl.(2).Y meaning it flashes yellow twice, this is called group flashing.
Under the influence of water currents (and wind if the top buoy is above the sea surface) the shape of the mooring line can be determined and by this the actual depth of the instruments. [8] [9] If the currents are strong (above 0.1 m/s) and the mooring lines are long (more than 1 km), the instrument position may vary up to 50 m.
Weather Buoy / Data Buoy / Oceanographic Buoy operated by the Marine Data Service. The first known proposal for surface weather observations at sea occurred in connection with aviation in August 1927, when Grover Loening stated that "weather stations along the ocean coupled with the development of the seaplane to have an equally long range, would result in regular ocean flights within ten years."
The investigation concluded that the buoy's hull size was of insufficient length to be moored in 3,600 feet (1,097 m) of water. To support such a mooring, a similarly shaped hull had to be 20 feet (6.1 m) long and displace approximately 20,000 pounds (9,072 kg). This was to become the prototype of the buoy now known as the NOMAD. [2]
A rope made of floating synthetics such as polypropylene attaches to the mooring and in turn attaches to a buoy. The buoy can float at the surface (lasting 3–4 years) or lie subsurface to avoid detection and surface hazards such as weather and ship traffic.