sector light
A navigational light that is visible only for a specific sector or arc of a circle, enabling a boat to determine that it lies within that sector. Sector lights might mark the entrance to a channel.
secure ...
6 Minesweeping station-keeping lights (two white limited-sector lights)
sec. 707.7 Submarine identification light (intermittant flashing amber beacon--three flashes, one per second, floowed by three-second off period)
sec. 707.
The lighthouse at Ardnakinna Point on the west end of Bear (Bere) Island guides mariners to the West Entrance of Bearhaven. Its white and red (WR) sector lights make it obvious at night whether you are headed for the entrance (white light) or not ...
sector - An arc of a circle in which certain types of navigational lightlights known as sector lights are visible.
secure - To make fast. To stow an object or tie it in place.
 See also: Sector, Point, Navigation, Light, High
  
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