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Just like traffic lights and signs help drivers on the road, boaters have buoys and signs to guide them to and from shore safely.
A navigational aid (NAVAID), also known as aid to navigation (ATON), is any sort of signal, markers or guidance equipment which aids the traveler in navigation, usually nautical or aviation travel. Common types of such aids include lighthouses , buoys , fog signals , and day beacons .
A sea mark, also seamark and navigation mark, is a form of aid to navigation and pilotage that identifies the approximate position of a maritime channel, hazard, or administrative area to allow boats, ships, and seaplanes to navigate safely.
Diagram of cardinal marks as seen during the day, with their light patterns. The lights shown here are configured as "Quick". A cardinal mark is a sea mark (a buoy or other floating or fixed structure) commonly used in maritime pilotage to indicate the position of a hazard and the direction of safe water.
A navigational marker that vanished off NOAA Florida Keys National Marine Sanctuary in South Florida turned up on an island more than 4,300 miles away, officials say.
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 word is also used in a more specific, technical sense to refer to a signboard or daytime identifier that is attached to a day beacon or other aid to navigation. [2] In that sense, a daymark conveys to the mariner during daylight hours the same significance as the aid's light or reflector does at night. [ 3 ]
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