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An object such as a wreck, net, etc., which blocks a fairway, route, etc.

Related Terms

BACKWASH

Water or waves thrown back by an obstruction such as a seaward, breakwater, cliff, etc

OBSTRUCTION LIGHT

A light indicating a radio tower or other obstruction to aircraft.

BUOYAGE

A system of buoys. One in which the buoys are assigned shape, color, and number distinction in accordance with location relative to the nearest obstruction is called a cardinal system. One in which buoys are assigned shape, color, and number distinction as a means of indicating navigable waters is called a lateral system.

CLEAR BERTH

A berth in which a vessel may swing at anchor without striking or fouling another vessel or an obstruction

FOUL (OF ANCHOR)

Anchor has its own cable twisted around it or has fouled an obstruction

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.

RADIONAVIGATION

1. The determination of position, or the obtaining of information relating to position, for the purposes of navigation by means of the propagation properties of radio waves. 2. As defined by the International Telecommunication Union (ITU), radiodetermination used for the purposes of navigation, including obstruction warning.

SHADOW SECTOR

A sector on the radarscope in which the appearance of radar echoes is improbable because of an obstruction near the antenna. While both blind and shadow sectors have the same basic cause, blind sectors generally occur within the larger angles sub- tended by the obstruction.

SHADOW

1. Darkness in a region, caused by an obstruction between the source of light and the region. By extension, the term is applied to similar condition when any form of radiant energy is cut off by an obstruction, as in a radar shadow. The darkest part of a shadow in which light is completely cut off is called the UMBRA; the lighter part surrounding the umbra in which the light is only partly cut off is called the PENUMBRA. 2. A region of diminished rainfall on the lee side of a mountain or mountain range, where the rainfall is noticeably less than on the windward side. Usually called RAIN SHADOW.

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.
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