Navigation Latest Update with

Navigation Latest Update with Verified Solutions Aid to Navigation any device external to a vessel that is intended to assist a navigator to determine position or safe course, or to warn of dangers and obstructions to navigation Daybeacons stationary visual navigational aids, unlighted Daymarks fixed structures that mark hazards or channels, may have fog signal that sounds during low visibility Major Light high-intensity and reliable light exhibited from a fixed structure or marine site Primary Major Light major light established for making landfall from sea Secondary Major Light major light established at harbor entrances Minor Light low to moderate intensity light used to mark a specific channel or location Range Lights and Markers pairs of nav aids, either lighted or unlighted, when aligned mark a channel; 2 fixed structures or lights usually located some distance apart; visible day and night eclipses dark intervals occulting light light totally eclipsed at regular intervals; duration of light duration of darkness flashing light flashes on and off at regular intervals; duration of light duration of darkness isophase light flashes at regular intervals; duration of light = duration of dark sector lights lights used to warn the navigator of hazards to navigation when approaching from certain dangerous arcs/sectors by varied colors red sector light danger area green sector light turning points or best water areas white sector light good water buoys floating aids moored to the seabed by sinkers with chain or other moorings of various lengths, variety of purposes watch circle = mooring lengths; buoys can be expected to move within this region IALA International Association of Lighthouse Authorities Maritime buoyage systems and IALA region a, region b lateral marks indicate PORT and STBD side of channels isolated danger marks directly on or over dangers safe water marks mid-channel buoys