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Beam angle may be as tight as 8 to 10 degrees in extreme cases, or as wide as around 140° with a plain flat glass port. Even wider angles are possible (exceeding 180°) with a domed port on the light, or a "test tube" light without reflector. LED lights usually use an internal "lens" to produce a focused beam.
Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
The boats were built by Kvichak Marine Industries of Kent, Washington and Marinette Marine of Manitowoc, Wisconsin. [15] [16] Near-Shore Life Boat 42' 39-ft Tactical Training Boat 39' 38-ft Training Boat 38' Arctic Survey Boat: 38' Only one of these vessels is used by the Coast Guard. It is kept on the USCGC Healy and is used for arctic studies.
A set of modern LED flashlights. A flashlight or electric torch (Commonwealth English), usually shortened to torch, is a portable hand-held electric lamp.Formerly, the light source typically was a miniature incandescent light bulb, but these have been displaced by light-emitting diodes (LEDs) since the early 2000s.
Roaring Middle light float, off King's Lynn at position 52° 58´·64N., 0° 21´·08E.. A light float is a type of lighted navigational aid forming an intermediate class between lightvessels and large lighted buoys; they are generally smaller than lightvessels and carry less powerful lights. [1]
Leading lights, also known as range lights in the United States, are a pair of light beacons used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; they may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation. The beacons consist ...
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