Sector (of a sector light)

From International Dictionary of Marine Aids to Navigation
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The space bounded by two vertical planes passing through the luminous source of the sector light and within which a light of a given character is visible. (Fig.45)

Ch2 Fig45.jpg

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM