航海词汇英文.doc
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1、AActual 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; c
2、aused 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 Hemisphe
3、re, 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 B.C.Azimuth; the horizontal angular distance from a reference position to a celestial body
4、, 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 comp
5、ass 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; C Navigation Terms.Cape; a piece of land that that projects out into a large body of water.Cardinal Marks; buoyage marks indica
6、ting 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 f
7、or 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.Characterist
8、ics; 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 o
9、nes 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 cours
10、e 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.Compass; a device that always points towards magnetic north, used for navigation.Compass Rose; is a design on a chart that
11、shows direction. It points which way is north, south, east, west, and some intermediate directions.Constellations; Star groups. Conversion tables; used to convert units of one system to units in another.Copernicus; 1473-1543, Polish astronomer credited with disproving the Ptolemaic System.Course; th
12、e direction in which a vessel is heading or is intended to be steered, the direction through the water. Course made good; the direction in which the vessel is actually traveling as opposed to the direction in which it is pointing. Corrections; alterations made to charts to update navigational inform
13、ation.Cross bearing; using LOPs from several navigational aids or marks to obtain a position fix.Crux; the Southern Cross a constellation seen in the southern hemisphere. D Navigation Terms.Dead reckoning; determining a position by plotting courses and speeds from a known position. Declination; the
14、angular distance to a point on the celestial sphere measured north and south from the celestial equator along the hour circle.Deviation; the compass errors caused by metallic o magnetic objects on board the vessel.Dip; a correction to be applied to sextant attitudes to compensate for height of eye a
15、bove sea level. Doldrums; the Inter-tropical Convergence Zone (or ITCZ) a belt of very still air between 5 degrees north and 5 degrees south of the equator.Drift; the speed in knots of the effect of current or tide on a vessels progress.Drying height; the height above chart datum, on a chart, of any
16、 areas which are uncovered at low water.Duration of tide; the time between high an low water, normally just over 6 hours. E Navigation Terms.Ebb; out-flowing tide. Electronic logs or E log books; a method of standardising the keeping of logs digitally on commercial vessels.Electronic charts; there a
17、re two different types see Vector charts and Raster marine charts.ENT; , Evening Nautical Twilight.EP; Estimated Position, the DR plus the effects of current.Ephemerals; a published collection of tables giving coordinates for astronomical bodies for specific times.Estimated Position; a DR position w
18、hich has been adjusted to allow for Set and Drift.ETA; estimated time of arrival.Equator; an imaginary circle around the earth, halfway between the north and south poles. F Navigation Terms.Fathom; an old fashioned unit of measurement to measure depth, approximately equal to 6 feet or 1.8 meters.Flo
19、od; incoming tide.First Point of Aries;a point on the celestial sphere which is used as a reference point, it is in fact where the Ecliptic and the Celestial Equator cross.Fix; a position verified by reference to bearings take off a known point such as a conspicuous land mark.Flotsam; the floating d
20、ebris resulting from a shipwreck.Forecasting Terms; used to convey specific, concise, information on weather conditions. G Navigation Terms.Gates Tidal.Geographical Position or GP; in celestial navigation it is the point on the earths surface directly beneath the Zenith, and the bit of the surface y
21、ou are standing on is your bodys Geographical Position or GP.GHA, Greenwich Hour Angle; the measurement of a position, in degrees, westward from the Greenwich meridian. Read moreGMT, Greenwich Mean Time; now referred to as UTC, Coordinated Universal Time, or UT, it is the mean of the times of noon a
22、t the Greenwich Meridian.GPS, Global Positioning System; a system which uses information broadcast from orbiting satellites to calculate the longitude and latitude of a receiving device.Greenwich meridian;the Prime Meridian it is the 0longitude line, it is referred to as the Greenwich Meridian becau
23、se it passes through the Royal Observatory at Greenwich in the UK. Gyrocompass; a non magnetic type of compass. H Navigation Terms.Harbor BarsHand held, Compass; a small portable compass.Heading; the direction in which a vessel is pointing, as opposed to the course made good.HE, Height of Eye; the h
24、eight of a sextant users eye above sea level, needed to add as a correction to a site reduction.Height of tide; a figure taken from the tide tables indicating the depth of water above the chart datum.Horizon; the apparent line, for an observer where the earths surface and the sky meet. Also a circle
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