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An unlighted fixed structure which is equipped with a dayboard for daytime identification.



Related Terms

FIXED AND VARIABLE PARAMETERS OF SATELLITE ORBIT

The fixed parameters are those parameters which describe a satellite's approximate orbit and which are used over a period of hours. The variable parameters describe the fine structure of the orbit as a function of time and are correct only for the time at which they are transmitted by the satellite

MAJOR LIGHT.

A light of high intensity and reliability exhibited from a fixed structure or on marine site (except range lights). Major lights include primary seacoast lights and secondary lights.

MINOR LIGHT

An automatic unmanned light on a fixed structure usually showing low to moderate intensity. Minor lights are established in harbors, along channels, along rivers, and in isolated locations.

BALANCED DRAFT

The maintenance of a fixed value of draft in a furnace at all combustion rates by control of incoming air and outgoing products of combustion.

VANE

A fixed or adjustable plate inserted in a gas or air stream used to change the direction of flow.

S.U.S.

Saybolt Universal Second. Unit of oils viscosity. The time required for a fixed volume of oil to flow through a tube of a definite diameter at constant temperature.

HEAT RELEASE

The total quantity of thermal energy above a fixed datum introduced into a furnace by the fuel, considered to be the product of the hourly fuel rate and its high heating value, expressed in Btu per hour per cubic foot of furnace volume or square foot of heating surface.

CARGO CONTAINMENT SYSTEM

The arrangement for containment of cargo including, where fitted, primary and secondary barriers, associated insulations, interbarrier spaces and the structure required for the support of these elements.

HOLD SPACE

The space enclosed by the ship’s structure in which a cargo containment system is situated.

CARDINAL BUOY

A seamark, i.e. a buoy, indicating the north, east, south or west from a fixed point, e.g. a wreck

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