A light has distinctive characteristics which distinguish it from other lights or convey specific information. A light may show a distinctive sequence of light and dark intervals. Additionally, a light may display a distinctive color or color sequence. In the Light Lists, the dark intervals are referred to as eclipses. An occulting light is a light totally eclipsed at regular intervals, the duration of light always being greater than the duration of darkness. A flashing light is a light which flashes at regular intervals, the duration of light always being less than the duration of darkness.

An isophase light flashes at regular intervals, the duration of light being equal to the duration of darkness. Light phase characteristics are the distinctive sequences of light and dark intervals or sequences in the variations of the luminous intensity of a light. The light phase characteristics of lights which change color do not differ from those of lights which do not change color. A light showing different colors alternately is described as an alternating light. The alternating characteristic may be used with other light phase characteristics.

Light-sensitive switches extinguish most lighted navigation aids during daylight hours. However, owing to the various sensitivity of the light switches, all lights do not come on or go off at the same time. Mariners should account for this when identifying aids to navigation during twilight periods when some lighted aids are on while others are not.

• Defining Navigational Errors - 2009-04-18 - 12:27:45
• ECDIS And The Integrated Bridge - Operating Concept - 2009-04-17 - 11:39:41
• What is Celestial Sphere? - 2009-04-14 - 12:05:17
• Define Navigational Astronomy - 2009-04-13 - 11:58:40
• The Sailing - Terms and Definitions - 2009-04-13 - 01:10:36
• Concept of piloting - 2009-04-11 - 11:59:56
• Radar Piloting Concept - 2009-04-11 - 01:12:32
• Radar Navigation Concept - 2009-04-11 - 12:24:35
• Concept Differential GPS - 2009-04-11 - 07:17:53
• Global Positioning System Concepts - 2009-04-10 - 05:36:08

• < Prev
• Next >