航海词汇英文

Actual depth; the true depth of water as opposed to a predicted depth. Tidal height from table added to the charted depth.

Almanac; an annual publication containing Tide Tables astronomical ephemerals etc.

Altitude; the angular distance of a celestial body above the viewers horizon.

Anabatic Winds; caused by warm air rising up a slope to be replaced by cooler air, as opposed to kabatic, descending winds.

Apparent wind; the wind as felt on board, this will be the actual wind modified by the wind created by the vessels movement.

Aries; the constellation of the Ram in the Northern Celestial Hemisphere, see also, First Point of Aries.

Astrolabe; an instrument used to determine the altitude of celestial objects before the introduction of the sextant. The first recorded use by Greek astronomers in around 200 .

Azimuth; the horizontal angular distance from a reference position to a celestial body, usually measured clockwise in degrees from the direction of the nearest pole.

B Navigation Terms.

Barometer; an instrument for measuring atmospheric pressure. Barometric Gradient; the rate at which atmospheric pressure rises of falls. Bars Harbor Bar.

Beacon; an unlit navigation mark.

Bearing; the compass reading taken of a object in relation to the observer. Beaufort Scale; a numerical method of describing wind strength.

Body; a celestial object.

Buoyage Marks and Systems;

Cape; a piece of land that that projects out into a large body of water. Cardinal Marks; buoyage marks indicating the direction of safe water with reference to the cardinal points.

Cardinal Points; the four main points of the compass, North, East, South and West.

Cartography; the study and the construction of maps. Cartographer; a map maker.

CC or Compass Course; the course to steer which has been corrected for current, variation, and deviation.

Celestial navigation; a method of navigating by referring to the stars or other objects in the sky.

Celestial sphere; an imaginary sphere with the earth at its center, on whose surface the stars, planets and other heavenly bodies appear to be situated.

Characteristics; the distinctive pattern of flashes used to identify a light. Chart datum; the reference level on charts to which tidal heights are referred.

Charted depth; the depth shown on the chart for a particular point on the sea bed.

Chronometer; a very accurate clock or watch that is used for determining one's longitude at sea

Circumnavigate; to travel around the entire Earth.

Civil twilight; times given in the almanac, for listed latitudes for approximately the best time to take a morning or evening sight, when both the horizon and the heavenly bodies are visible.

CMG; the Course Made Good is the course over the ground.

Cocked hat; a triangle formed by a series of three LOPs which do not meet at an exact point.

COLREGS; the international rules for prevent of collisions at sea.