10.2 地文航海[2701]Leeway is the ______.A. difference between the true course and the compass courseB. momentum of a vessel after her engines have been stoppedC. lateral movement of a vessel downwind of her intended courseD. displacement of a vessel multiplied by her speedKEY: C[2702]______ is the process by which the position of the vessel at any moment is found by applying the last well-determined position to the run that has been made since，using for this purpose the ship's course and the distance being those indicated by log．A. dead reckoningB. dead weightC. dead slow aheadD. dead slow asternKEY: A[2703]______ means the curve on the earth's surface which cuts all the meridians at the same angle．A. Great CircleB. Position LineC. Rhumb lineD. True BearingKEY: C[2704]A bold reef is a reef ______.A. with part of it extending above the waterB. that can be detected by water turbulenceC. that drops off sharplyD. perpendicular to the currentKEY: B[2705]A buoy having red and green horizontal bands would have a light characteristic of ______.A. interrupted quick flashingB. composite group flashingC. Morse (A)D. quick flashingKEY: B[2706]A buoy marking a wreck will show a(n) ______.A. white light FL (2) and a topmark of 2 black spheresB. occulting green light and may be letteredC. yellow light and will be numberedD. continuous quick white light and may be numberedKEY: A[2707]A buoy with a composite group-flashing light indicates a(n) ______.A. anchorage areaB. fish net areaC. bifurcationD. dredging areaKEY: C[2708]A buoy，being a shape of cylinder and with red group flashing，shows that it is ______.A. left-side buoyB. right-side buoyC. a buoy of safetyD. a buoy of dangerKEY: A[2709]A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the ______.A. north side of the markB. west side of the markC. east side of the markD. south side of the markKEY: A[2710]A dead reckoning (DR) plot ______.A. ignores the effect of surface currentsB. is most useful when in sight of landC. must be plotted using magnetic coursesD. may be started at an assumed positionKEY: A[2711]A dead reckoning (DR) plot ______.A. must utilize magnetic coursesB. must take set and drift into accountC. should be replotted hourlyD. should be started each time the vessel's position is fixedKEY: D[2712]A fairly accurate estimation of a ship's position can be calculated by a technique known as ______.A. dead reckoningB. PilotageC. great circle sailingD. geographic navigationKEY: A[2713]A large navigational buoy (LNB) is painted ______.A. redB. yellowC. with red and white vertical stripesD. with a distinct color and pattern unique to each buoyKEY: A[2714]A line connecting all possible positions of your vessel at any given time is a ______.A. longitude lineB. latitude lineC. line of positionKEY: C[2715]A line of position is ______.A. a line connecting two charted objectsB. a line on some point of which the vessel may be presumed to be locatedC. the position of your vesselD. not used in a running fixKEY: B[2716]A position obtained by applying only your vessel's course and speed to a known position is a ______.A. dead-reckoning positionB. fixC. probable positionD. running fixKEY: A[2717]A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) ______.A. running fixB. dead-reckoning positionC. fixD. estimated positionKEY: A[2718]A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) ______.A. dead reckoning positionB. estimated positionC. fixD. None of the aboveKEY: B[2719]A position that is obtained by using two or more intersecting lines of position，taken at nearly the same time，is a(n) ______.A. estimated positionB. fixC. running fixD. dead-reckoning positionKEY: B[2720]A relative bearing is always measured from ______.A. true northB. magnetic northC. the vessel's beamD. the vessel's headKEY: D[2721]A single line of position combined with a dead-reckoning position results in a(n) ______. A. running fixC. estimated positionD. assumed positionKEY: C[2722]A vessel's position should be plotted using bearings of ______.A. buoys close at handB. fixed known objects on shoreC. buoys at a distanceD. All of the aboveKEY: B[2723]At the magnetic equator there is no induced magnetism in the vertical soft iron because ______.A. the lines of force cross the equator on a 0-180alignmentB. the quadrantal error is 0C. there is no vertical component of the Earth's magnetic fieldD. the intercardinal headings have less than 1errorKEY: C[2724]In plotting a running fix，how many fixed objects are needed to take your lines of position from?A. ThreeB. TwoC. OneD. NoneKEY: C[2725]Lighted white and orange buoys must show which color light?A. OrangeB. WhiteC. RedD. Alternating yellow and whiteKEY: B[2726]Preferred channel buoys indicate the preferred channel to transit by ______.A. odd or even numbersB. the color of their top bandC. the location of the buoy in the channel junctionD. the buoy's light rhythmsKEY: B[2727]Restricted areas at locks and dams are indicated by ______.A. flashing red lights upstream and fixed red lights downstreamB. yellow unlighted buoysC. signs and/or flashing red lightsD. red daymarks upstream and green daymarks downstreamKEY: C[2728]The luminous range of a light takes into account the ______.A. glare from background lightingB. existing visibility conditionsC. elevation of the lightD. observer's height of eyeKEY: B[2729]The maximum distance at which a light may be seen under the existing visibility conditions is called ______.A. nominal rangeB. luminous rangeC. charted rangeD. geographic rangeKEY: B[2730]The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen ______.A. under existing visibility conditionsB. under perfect visibilityC. with ten miles visibilityD. with fifteen miles visibilityKEY: C[2731]The period of a lighted aid to navigation refers to the ______.A. date of construction or establishmentB. length of time between flashes of the lightC. time required for the longest flash of each cycleD. time required for the light to complete each cycleKEY: D[2732]The positions and characteristics of lights and buoys shown within the port area are ______.A. untrueB. impossibleC. suspectfulD. unimportantKEY: A[2733]The shortest distance between any two points on earth defines a ______.A. small circleB. great circleC. rhumb lineD. hyperbolaKEY: B[2734]There are a number of buoys {in the vicinity}．A. nearbyB. in viewC. visibleD. far fromKEY: A[2735]There is sufficient anchorage for ______ at all time around the No．1 buoy and for smaller vessels around the No．4 buoy．A. deep laded vesselsB. deeply load vesselsC. deep loading vesselsD. deeply loaded vesselsKEY: D[2736]This is ______ where we shall anchor．A. the light-houseB. the anchorageC. the pilot stationD. the light-buoyKEY: B[2737]Two navigational hazards are located near to each other，but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by ______.A. the differing light colorsB. one system having odd numbers while the other system has even numbersC. one system using horizontal bands while the other system uses vertical stripesD. the difference in the periods of the lightKEY: D[2738]Uncharted lights，fog signals and radar beacon transmissions may be ______ near the station．A. encounteredB. metC. contactedD. seenKEY: A[2739]Under the IALA - A Buoyage System，a buoy used as a port hand mark would not show which light characteristic?A. IsophaseB. Quick flashingC. Long flashingD. Group Flashing (2 + 1)KEY: D[2740]What describes an accurate position that is NOT based on any prior position?A. Dead-reckoning positionB. Estimated positionC. FixD. Running fixKEY: C[2741]What indicates a dual purpose buoy?A. Red buoy with a horizontal yellow bandB. Red and white vertically-striped buoy with a vertical yellow stripeC. Red and white vertically-striped buoy with a red spherical topmarkD. Green buoy with a yellow squareKEY: D[2742]What is the light characteristic of a lighted，preferred-channel buoy?A. Group flashingB. Composite group flashingC. Interrupted quick flashingD. Fixed and flashingKEY: B[2743]What is the major advantage of high altitude observations?A. Errors due to unusual parallax are eliminated.B. The same body can be used for a fix from observations separated by several minutes.C. The declination is the only information needed from the almanac.D. The semidiameter correction of the sextant altitude is eliminated.KEY: B[2744]When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by ______.A. the shape of an unlighted buoyB. the light color of a lighted buoyC. the color of the topmost bandD. whether the number is odd or evenKEY: D[2745]When approaching a preferred-channel buoy，the best channel is NOT indicated by the ______.A. light characteristicB. color of the uppermost bandC. shape of an unlighted buoyD. color of the lightKEY: A[2746]When entering a channel from seaward，the numbers on buoys ______.A. are the same as their Light List numberB. are marked in 6 inch figures with retroreflective materialC. increase with the even numbers to starboardD. decrease with the odd numbers to starboardKEY: C[2747]When entering from seaward，a buoy displaying a single-flashing red light would indicate ______.A. a junction with the preferred channel to the leftB. a sharp turn in the channel to the rightC. the starboard side of the channelD. a wreck to be left on the vessel's port sideKEY: C[2748]When making landfall at night，you can determine if a light is a major light or an offshore buoy by ______.A. the intensity of the lightB. checking the period and characteristics against the Light ListC. the color，because the buoy will have only a red or a green lightD. Any of the above can be used to identify the light.KEY: B[2749]When navigating a vessel，you ______.A. can always rely on a buoy to be on stationB. can always rely on a buoy to show proper light characteristicsC. should assume a wreck buoy is directly over the wreckD. should never rely on a floating aid to maintain its exact positionKEY: D[2750]When using a buoy as an aid to navigation which of the following should be considered?A. The buoy should be considered to always be in the charted location.B. If the light is flashing，the buoy should be considered to be in the charted location.C. The buoy may not be in the charted position.D. The buoy should be considered to be in the charted position if it has been freshly painted. KEY: C。