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Questions and Answers
Where can additional information about lights not given on charts be found?
Where can additional information about lights not given on charts be found?
What is the term for the sequence of light and darkness in a light characteristic?
What is the term for the sequence of light and darkness in a light characteristic?
What is a light that shows continuously and steadily without interruption called?
What is a light that shows continuously and steadily without interruption called?
What is the term for the time taken to complete one sequence in a rhythmic light?
What is the term for the time taken to complete one sequence in a rhythmic light?
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What is one element of a sequence in a rhythmic light called?
What is one element of a sequence in a rhythmic light called?
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Study Notes
Characteristics of Lights
- Additional information about lights not found on charts can be found in the Admiralty List of Lights and Fog Signals (NP 74 to 84) or the Admiralty Sailing Directions (NP 1 to 72)
- The characteristics of a light are its sequence of light and darkness and, in some cases, its color
- Lights can be divided into three classes: fixed, rhythmic, and alternating
Fixed Lights
- Fixed lights show continuously and steadily without interruption
Rhythmic Lights
- Rhythmic lights show a sequence of intervals of light and darkness
- The whole sequence is repeated at regular intervals
- Terms used to describe rhythmic lights include:
- Period: the time taken to complete one sequence
- Phase: one element of a sequence (e.g. a flash, an eclipse)
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Description
This quiz covers Admiralty List of Lights and Fog Signals, Admiralty Sailing Directions, and characteristics of lights, including sequence and color.
