Questions and Answers
Where can you find additional information about lights not given on charts?
What is the term used to describe the sequence of light and darkness in a light?
What type of light shows a sequence of light and darkness repeated at regular intervals?
What is the time taken to complete one sequence of a rhythmic light called?
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What is one element of a sequence of a rhythmic light?
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Study Notes
Light Characteristics
- The characteristics of a light are also known as its character or characteristic.
- The principal characteristics of a light include the sequence of light and darkness, and in some cases, the colour of the light.
Classes of Lights
- Lights can be divided into three classes: fixed, rhythmic, and alternating.
- Fixed Lights: show continuously and steadily, without interruption.
Rhythmic Lights
- Rhythmic Lights: show a sequence of light and dark, with the whole sequence repeated at regular intervals.
- Period of a Rhythmic Light: the time taken to complete one sequence.
- Phase of a Rhythmic Light: one element of a sequence, such as a flash or an eclipse.
Sources of Light Information
- Admiralty List of Lights and Fog Signals (NP 74 to 84): provides additional information not found on charts.
- Admiralty Sailing Directions (NP 1 to 72): provides only the height and a description of the light structure.
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Description
This quiz covers the Admiralty List of Lights and Fog Signals, including the characteristics of lights, and their sequence, colour, and structure. It also compares the information provided in the List with that found in Admiralty Sailing Directions.
