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aid to navigation

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aid to navigation [ād tə ‚nav·ə′gā·shən]
(navigation)
A device external to a craft, designed to assist in determination of position of the craft, or of a safe course, or to warn of dangers or obstructions.


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The exact meaning of an aid to navigation may not be clear to the boater unless the appropriate marine chart is consulted.
Incorporating an efficient optical design and a peak intensity of 44 candela (as defined by the International Association of Marine Aids to Navigation and Lighthouse Authorities [IALA]), the M650 marine lantern includes more than 256 flash patterns, and can be ordered in all IALA (December 2008) marine aid to navigation light colours -- green, red, blue, yellow and white -- as indicated on each unit by a coloured band on the housing.
 
 
 
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