Key:seamark:light:1:category
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 seamark:light:1:category
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| Description |
|---|
Categories of lights. 
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| Group: marine navigation |
| Used on these elements |
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| Documented values: 3 |
| Useful combination |
| Status: de facto |
| Tools for this tag |
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Categories of lights (CATLIT).
Values
| seamark:light:category | Definition | |
|---|---|---|
| Directional function | directional | 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. |
| Leading light | leading | A light associated with other lights so as to form a leading line to be followed. |
| Aero light | aero | An aero light is established for aeronautical navigation and may be of higher power than marine lights and visible from well offshore. |
| Air obstruction light | air_obstruction | A light marking an obstacle which constitutes a danger to air navigation. |
| Fog detector light | fog_detector | A light used to automatically determine conditions of visibility which warrant the turning on or off of a sound signal. |
| Flood light | floodlight | A broad beam light used to illuminate a structure or area. |
| Strip light | strip_light | A light whose source has a linear form generally horizontal, which can reach a length of several metres. |
| Subsidiary light | subsidiary | A light placed on or near the support of a main light and having a special use in navigation. |
| Spotlight | spotlight | A powerful light focused so as to illuminate a small area. |
| Front | front | Term used with leading lights to describe the position of the light on the lead as viewed from seaward. |
| Rear | rear | Term used with leading lights to describe the position of the light on the lead as viewed from seaward. |
| Upper | upper | Term used with leading lights to describe the position of the light on the lead as viewed from seaward. |
| Lower | lower | Term used with leading lights to describe the position of the light on the lead as viewed from seaward. |
| Moire effect | moire | 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. |
| Emergency light | emergency | A light available as a backup to a main light which will be illuminated should the main light fail. |
| Bearing light | bearing | A light which enables its approximate bearing to be obtained without the use of a compass. |
| Horizontally disposed | horizontal | 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. |
| Vertically disposed | vertical | 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. |