Sector Lights
Definition of Sector Lights
A sector light is a fixed aid to navigation that displays a light of different colours and/or rhythms over designated arcs. The colour of the light provides directional information to the mariner.
Description of Sector Lights
A sector light may be used:
To provide directional information in a fairway;
To indicate a turning point, a junction with other channels, a hazard or other items of navigational importance;
To provide information on hazard areas that should be avoided;
In some cases a single directional light may be used.
Source: IALA