An area totally shielded from radar transmissions by part of the ship's structure.



Related Terms

RADAR CROSS SECTION

The area of a plane element situated at the position of an object and normal to the direction of the radar transmitter, which would be traversed by a power such that, if the power were re-radiated equally in all directions with suitable polarization, it would give an echo of the same power as that given by the object itself. Also called EQUIVALENT ECHOING AREA.

RADAR SHADOW

The area shielded from radar signals because of an intervening obstruction or absorbing medium. The shadow region appears as an area void of targets.

SHADOW REGION

A region shielded from radar signals because of an intervening obstruction or absorbing medium. This region appears as an area void of targets on a radar display such as a plan position indicator. The phenomenon is called RADAR SHADOW.

GUARD ZONE

A user determined area of the radar screen, within which the presence of an echo causes an alarm to sound.

EFFECTIVE CONFUSION AREA

Amount of chaff whose radar cross-sectional area equals the radar cross-sectional area of the particular aircraft ataparticularfrequency.

SCAN

In the use of radar, to search or investigate an area or space by varying the direction of the radar antenna and thus the beam. Normally scanning is done by continuous rotation of the antenna.

SMOOTH WATERS

Sheltered waters Class E area - for the purposes of the NSCV Part B, operations within specified geographical limits designated by the (State) Authority as smooth waters, typically waters where the significant wave height does not exceed 0.5 m from trough to crest for at least 90 per cent of the time.

BALANCED RUDDER

A rudder design where the pivot point and the centre of its area meet, reducing the effort needed to turn it.

SLOOP RIG

one mast, two sails. The mainsail is aft of the mast and a jib forward of the mast, usually attached to the forestay. Spritsail rig - a sprit is a boom that extends upward from the mast foot to the topmost corner of a quadrangle sail. The rig extends the sail area set from a short mast.

DEPOSIT GAGE

The general name for instruments used in air pollution studies for determining the amount of material deposited on a given area during a given time.

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