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Lights designed to assist navigation. {{languages|Navigation Lights}}

Two or more lights the characters of which are in synchronism. {{languages|Synchronous Lights}}

...more lights forming a leading line, is situated between the front and rear lights. (Fig.47) [[Category:2.5 Types and Characteristics of Lights]]

The major light of two or more lights situated on the same support or neighbouring supports. [[Category:2.5 Types and Characteristics of Lights]]

Alternative term: Range Lights (U.S.A.) Two or more lights positioned to form a leading / range / transit line to be followed.

[[Category:2.5 Types and Characteristics of Lights]]

[[Category:2.5 Types and Characteristics of Lights]]

The operation of causing a source to emit light. {{languages|Lighting (of a light)}}

[[Category:2.5 Types and Characteristics of Lights]]

A light which, of a number of leading lights in line, is the nearest to the navigator using the leading line. [[Category:2.5 Types and Characteristics of Lights]]

A light which, of a number of leading lights in line, is the farthest from the navigator using the leading line. (Fig.47 [[Category:2.5 Types and Characteristics of Lights]]

A rhythmic light showing light of alternating colours. [[Category:2.5 Types and Characteristics of Lights]]

[[Category:2.5 Types and Characteristics of Lights]]

...operated and kept in service by a keeper able to intervene at once in case of need. [[Category:2.5 Types and Characteristics of Lights]]

...ively brief appearance of a light, in comparison with the longest interval of darkness in the same character. (Fig. 40b) [[Category:2.5 Types and Characteristics of Lights]]

Apparatus emitting light (2-1-005) of distinctive character, for use as a navigational aid by night or, exception [[Category:2.5 Types and Characteristics of Lights]]

...sonnel at a considerable distance from the light, through the intermediary of electrical or radio links or both. [[Category:2.5 Types and Characteristics of Lights]]

[[Category:2.5 Types and Characteristics of Lights]]

[[Category:2.5 Types and Characteristics of Lights]]

A light which presents the same character over the whole horizon of interest to marine navigation. [[Category:2.5 Types and Characteristics of Lights]]

A light in which flashes of different duration are grouped in such a manner as to reproduce a Morse cha [[Category:2.5 Types and Characteristics of Lights]]

[[Category:2.5 Types and Characteristics of Lights]]

A light placed on or near the support of a main light and having a special use in navigation. [[Category:2.5 Types and Characteristics of Lights]]

...tively brief interval of darkness, in comparison with the longest interval of light in the same character. (Fig. 42a) [[Category:2.5 Types and Characteristics of Lights]]

A lamp brought into service in the event of failure of the lamp in regular service. It may often be brought into service automatic [[Category:2.5 Types and Characteristics of Lights]]

...t characters (usually different colours) over various parts of the horizon of interest to marine navigation. (Fig.45) [[Image:Angle Of Uncertainty 2023.png|400px|border]]

[[Category:2.5 Types and Characteristics of Lights]]

The horizontal angle subtended by a sector of a sector light. (Fig.45) [[Image:Angle Of Uncertainty 2023.png|400px|border]]

It is of lower intensity than the regular light but usually of the same character. [[Category:2.5 Types and Characteristics of Lights]]

A rhythmic light for which the alternations of light and darkness are of equal duration. [[Category:2.5 Types and Characteristics of Lights]]

...ch the occultations are combined in successive groups of different numbers of occultations. (Fig. 42c) [[Category:2.5 Types and Characteristics of Lights]]

...ically and may be maintained in service automatically for extended periods of time, but with routine visits for maintenance purposes. [[Category:2.5 Types and Characteristics of Lights]]

...which the flashes are combined in successive groups of different num-bers of flashes. (Fig. 40d) [[Category:2.5 Types and Characteristics of Lights]]

Alternative term: Characteristic (of a navigation light) The distinctive colour or periodic rhythm (or both) of a navigation light, enabling it to be identified.

An interval of darkness between appearances of a light. (Fig. 40b) ...term is properly applied only to an interval of dark-ness between flashes of shorter duration.

...ter and intended to be brought easily into service in the event of failure of the latter. [[Category:2.5 Types and Characteristics of Lights]]

...ch the rapid alternations are interrupted at regular intervals by eclipses of long duration. (Fig.43b) [[Category:2.5 Types and Characteristics of Lights]]

...g through the luminous source of the sector light and within which a light of a given character is visible. (Fig.45) [[Image:Angle Of Uncertainty 2023.png|400px|border]]

It is so situated and has luminous range and geographical range so great that it can be identified at a great distance. [[Category:2.5 Types and Characteristics of Lights]]

...ector may be flanked by sectors of greatly reduced intensity or by sectors of different colour or character. [[Category:2.5 Types and Characteristics of Lights]]

A light either on a fixed support or on a buoy, marking the limit of a navigable channel. [[Category:2.5 Types and Characteristics of Lights]]

...sectors of different character which define its margins with small angles of uncertainty. Most commonly the bounding sectors are of different colours (red and green). (Fig.46b)

...n the total duration of darkness and in which the flashes of light are all of equal duration. [[Category:2.5 Types and Characteristics of Lights]]

...tween the commencement of two identical successive cycles of the character of a rhythmic light. (Figs. 40-44) {{languages|Period (of a rhythmic light)}}

...ing light (2-1-005), either to be.viewed directly or to illuminate objects and their surroundings so that they may be seen. 2. An ensemble of lights.

1. A light exhibiting very rapid regular alternations of light and darkness. Note 1: In most countries, the maximum period of a quick-flashing light is 1 second

...e the colour and/or the flash rhythm change and where the resulting colour of the light is mixed/affected by two colours, or showing fading intensity due [[Image:Angle Of Uncertainty 2023.png|400px|border]]

...of darkness and in which the intervals of darkness (occultations) are all of equal duration. [[Category:2.5 Types and Characteristics of Lights]]

A light which appears continuous and steady and of constant colour to an observer whose position remains unchanged in relation Note: In Britain and U.S.A., the term "Fixed light" is also loosely used for a light sup-ported

...e of equal duration and this duration is clearly shorter than the duration of the eclipse between two successive groups. (Fig. 40c) [[Category:2.5 Types and Characteristics of Lights]]

...ry structures, designed to give light (2-1-005) of a distinctive character and to mark a known geographical location, in order to assist navigation. ...ance and has one or more resident lighthouse-keepers, the terms Lighthouse and, in French, Phare are usually employed.

...combined in groups, each group including the same number of occultations, and in which the groups are repeated at regular intervals. ...ion and this duration is clearly shorter than the duration of the interval of light between two successive groups. (Fig. 42b)

An exhibition of light for a given time between two darknesses. Note 1: In Germany and some other countries, brief appearances of light are classified according to duration