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Categories of lights. 
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| Group: marine navigation
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| Documented values: 3
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| Status: de facto
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Categories of lights (CATLIT).
Values
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seamark:light:category
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Definition
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| Directional function
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directional
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A light illuminating a sector of very narrow angle and intended to mark a direction to follow. A light tagged with this category should also carry a "seamark:light:orientation" tag.
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| Leading light
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leading
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A light associated with other lights so as to form a leading line to be followed.
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| Aero light
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aero
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An aero light is established for aeronautical navigation and may be of higher power than marine lights and visible from well offshore.
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| Air obstruction light
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air_obstruction
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A light marking an obstacle which constitutes a danger to air navigation.
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| Fog detector light
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fog_detector
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A light used to automatically determine conditions of visibility which warrant the turning on or off of a sound signal.
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| Flood light
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floodlight
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A broad beam light used to illuminate a structure or area.
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| Strip light
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strip_light
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A light whose source has a linear form generally horizontal, which can reach a length of several metres.
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| Subsidiary light
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subsidiary
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A light placed on or near the support of a main light and having a special use in navigation.
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| Spotlight
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spotlight
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A powerful light focused so as to illuminate a small area.
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| Front
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front
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Term used with leading lights to describe the position of the light on the lead as viewed from seaward.
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| Rear
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rear
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Term used with leading lights to describe the position of the light on the lead as viewed from seaward.
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| Upper
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upper
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Term used with leading lights to describe the position of the light on the lead as viewed from seaward.
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| Lower
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lower
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Term used with leading lights to describe the position of the light on the lead as viewed from seaward.
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| Moire effect
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moire
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A short range (up to 2km) type of directional light. Sodium lighting gives a yellow background to a screen on which a vertical black line will be seen by an observer on the centre line.
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| Emergency light
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emergency
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A light available as a backup to a main light which will be illuminated should the main light fail.
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| Bearing light
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bearing
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A light which enables its approximate bearing to be obtained without the use of a compass.
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| Horizontally disposed
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horizontal
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A group of lights of identical character and almost identical position, that are disposed horizontally. A light tagged with this category should also carry a "seamark:light:multiple" tag.
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| Vertically disposed
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vertical
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A group of lights of identical character and almost identical position, that are disposed vertically. A light tagged with this category should also carry a "seamark:light:multiple" tag.
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See also
