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.
sector
The arc in which a lighthouse's light is visible. A danger (red) sector is a portion of the light showing red to warn navigators away from shoals or land.
secure ...
The sectors marked on a chart and showing where a light is visible from the sea
ashore
To be on or to go to the shore.
Vertical sectors
(a) The vertical sectors of electric lights as fitted, with the exception of lights on sailing vessels underway shall ensure that: ...
sector: a colored segment in the sweep of a navigation light. A red sector, for example, warns of dangerous waters. scull: propel a boat by means of one oar over the stern.
[edit] Other terminology for the sector
There is a growing movement within the 'non'-profit and 'non'-government sector to define itself using more proactive wording.
A fitting in the shape of a sector of a circle secured to the rudder stock and through which the steering leads turn the rudder.
In theory, a light should have full intensity everywhere inside the sector and be absolutely dark outside the sector. In practice, this level of performance hasn't been achieved using common technology and at a reasonable cost.
In 1994, inspired by the automotive sector, and after stringent test done by skilled engineers, Azimut introduced the frameless window on the market.
10s 62m17/14M White and red flashing lights (one for each of the two sectors) every 10 seconds that are 62 meters high which can be seen for 17 nautical miles for the white sector and 14 nautical miles for the red sector miles on a clear night.
This type of technology was once only used by the military but has been opened up to the private sector. A GPS receiver can tell you the latitude, longitude and altitude of your current position.
Starboard: If any vessel approaches within this sector, keep out of its way.
(Note: This rule may not always apply if one or both vessels are sailboats.) ...
The main objectives of this organization are to promote and protect sound shipping policies in all sectors of shipping, to coordinate and present the views of its members and to exchange views with other shipowner groups.
Eye of the Wind:
Direction from which the wind is blowing; an unsailable sector between close hauled headings.
 See also: Navigation, Set, Point, After, Boat
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