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Definitions (833)
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River Port
A port that lies on the banks of a river. See also canal port, seaport, estuary port.
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Artificial Horizon
A horizon produced by bubble, gyro or mercury trough to allow measurement of altitude of celestial bodies.
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Watch Buoy
A buoy placed to mark a special position; in particular, near a light-vessel, to check its position.
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Vertical Clearance
The height above the datum for heights of the highest part of the underside of the span of a bridge, or the lowest part of an overhead cable. the vertical clearance of fixed bridges is measured from t [..]
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submerged
A feature is said to be submerged if it has sunk under water, or has been covered over with water.
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Equinox
Either of the two points at which the Sun crosses the equator: or the dates on which these occurrences take place.
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Arc of Visibility
The sector, or sectors, in which a light is visible from seaward.
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CONTROLLING DEPTH
The least depth within the limits of a channel: it restricts the safe use of the channel to draughts of less than that depth.
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Zooplankton
The microscopic drifting animal life of the oceans including the larvae of the larger swimming animals and fish.
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Yaw
Unavoidable oscillation of the ship's head either side of the course being steered or when at anchor, due to wind and waves.
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