This is an interactive test. Read each question and select the proper answer by clicking on the appropriate answer. If a "Y" appears, your choice is correct. If a "N" appears, more study may be in order.
71: A preferred-channel buoy may be __________.
Y a. lettered N b. spherical N c. showing a white light N d. All of the above 88: Which position includes the effects of wind and current?
N a. Dead reckoning position N b. Leeway position Y c. Estimated position N d. Set position 107: The average height of the surface of the sea for all stages of the tide over a 19 year period is called __________.
N a. mean high water N b. mean low water N c. half-tide level Y d. mean sea level 127: Mean low water is the average height of __________.
N a. the surface of the sea N b. high waters and low waters Y c. all low waters N d. the lower of the two daily low tides 155: The velocity of the current in large coastal harbors is __________.
Y a. predicted in Tidal Current Tables N b. unpredictable N c. generally constant N d. generally too weak to be of concern 199: Civil twilight occurs at 0558 zone time on 30 December 1981. Your DR position at that time is LAT 15°02'N, LONG 46°02'W. Which statement concerning the planets available for morning sights is TRUE?
Y a. At 0558, Mars can be used for an ex-meridian observation. N b. Venus, Jupiter, and Mars sights will yield a good three line fix. N c. Saturn will be near the prime vertical. N d. Venus will be visible low in the western sky. 281: A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________.
N a. white light Y b. red light N c. green light N d. light characteristic of Morse (A) 355: During the month of October the Sun's declination is __________.
N a. north and increasing N b. north and decreasing Y c. south and increasing N d. south and decreasing 395: If the Sun's observed altitude is 27°12', the zenith distance is __________.
Y a. 62°48' N b. 27°12' N c. 152°48' N d. 43°12' 420: You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown. The range continues to open. What action should you take? (D047NG )
Y a. Alter course to the left until the range closes then steer to the left of 306°T. N b. Maintain course as it is normal for the range to open as you get close. N c. Alter course to the left to close the range, then alter course to 309°T. N d. Alter course to the right to 309°T or more to bring the range in line. 428: A buoy bears 178°T at 3000 yards (2700 meters). What is the course to make good to leave the buoy 100 yards (90 meters) to starboard?
N a. 174°T Y b. 176°T N c. 178°T N d. 180°T 482: Which statement about a gnomonic chart is correct?
N a. A rhumb line appears as a straight line. N b. Distance is measured at the mid-latitude of the track line. N c. Meridians appear as curved lines converging toward the nearer pole. Y d. Parallels, except the equator, appear as curved lines. 483: Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as individual targets due to __________.
Y a. the effects of beam width N b. limitations on range resolution N c. the pulse length of the radar N d. the multiple-target resolution factor 523: A radar display in which North is always at the top of the screen is a(n) __________.
N a. unstabilized display Y b. stabilized display N c. composition display N d. relative display 643: When using the radar for navigating __________.
N a. the best fix is obtained by using a tangent bearing and a range N b. and using two radar ranges for a fix, the objects of the ranges should be close to reciprocal bearings Y c. and using ranges, the most rapidly changing range should be measured last N d. and crossing a radar range of one object with the visual bearing of a second object, the two objects should be 80° to 110° apart 818: Ocean swells originating from a typhoon can move ahead of it at speeds near __________.
N a. 10 knots N b. 20 knots N c. 30 knots Y d. 50 knots 838: A navigator fixing a vessel's position by radar __________.
N a. must use information from targets forward of the beam N b. should never use radar bearings N c. should only use radar bearings when the range exceeds the distance to the horizon Y d. can use radar information from one object to fix the position 855: Which condition exists at the summer solstice in the Northern Hemisphere?
N a. The north polar regions are in continual darkness. N b. The Northern Hemisphere is having short days and long nights. Y c. The Southern Hemisphere is having winter. N d. The Sun shines equally on both hemispheres. 882: Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?
N a. Geographical positions outlining the area of the sector Y b. True bearings as observed from the ship toward the light N c. An outline of the area of the sector N d. True bearings as observed from the light toward the ship 931: Under the IALA-B Buoyage System, when entering from seaward, a buoy that should be left to port will be __________.
N a. black N b. red Y c. green N d. yellow 986: A warm air mass is characterized by __________.
Y a. stability N b. instability N c. gusty winds N d. good visibility 1018: An aneroid barometer reading should be corrected for differences in __________.
Y a. elevation N b. temperature N c. wind speed N d. latitude 1062: What is the approximate geographic range of Horton Point Light, NY, if your height of eye is 40 feet (12.2 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS" .
N a. 18.8 nm Y b. 19.3 nm N c. 20.3 nm N d. 24.8 nm 1160: What will be the velocity of the tidal current at 0.2 mile SSW of Clason Point, NY, at 1125 on 17 April 1983?
N a. 0.5 knot N b. 0.8 knot Y c. 1.1 knots N d. 1.9 knots 1162: A line connecting all possible positions of your vessel at any given time is a __________.
N a. longitude line N b. latitude line Y c. line of position N d. fix 1253: The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is __________.
Y a. deviation N b. variation N c. compass error N d. dip 1349: The symbols shown are used on radio facsimile weather charts. Which of these symbols indicates a severe squall line? (D042NG )
N a. F N b. I Y c. G N d. H 1349: The symbols shown are used on radio facsimile weather charts. Which of these symbols indicates a severe squall line? (D042NG )
N a. F N b. I Y c. G N d. H 1364: The Sailing Directions are published in the Enroute format and the __________.
N a. Coastal editions N b. World Port Index N c. Pilot format Y d. Planning Guide 1425: Which is an inferior planet?
N a. Mars Y b. Venus N c. Neptune N d. Pluto 1438: In the Northern Hemisphere you are caught in the dangerous semicircle of a storm with plenty of sea room available. The best course of action is to bring the wind on the __________.
N a. port quarter and make as much headway as possible N b. starboard quarter and make as much headway as possible Y c. starboard bow and make as much headway as possible N d. port bow and make as much headway as possible 1454: Atmospheric pressure may be measured with a(n) __________.
N a. barograph N b. aneroid barometer N c. mercurial barometer Y d. All of the above 1475: Which type of cloud is the classic "thunderhead"?
Y a. Cumulonimbus N b. Stratus N c. Cirrus N d. Altostratus 1572: Generally speaking, in the Northern Hemisphere, when winds are blowing from between SE and SW the barometric reading __________.
N a. makes no change at all Y b. is somewhat lower than it would be for winds from a northern quadrant N c. is uncertain and may fluctuate by increasing and decreasing N d. is somewhat higher than it would be for winds from the northern quadrant 1590: Civil twilight starts at 1812 zone time on 26 August 1981, Your DR position at that time is LAT 21°06'S, LONG 14°56' W. Which statement concerning the planets available for evening sights is TRUE?
N a. Mars will be near the prime vertical in the eastern sky. Y b. Venus may be identified from Saturn and Jupiter because it is the brightest. N c. Sights of Venus, Jupiter, and Saturn will yield a good three line fix. N d. A sight of either Jupiter, Saturn, or Venus will give a latitude line. 1610: When the navigational channel passes under a fixed bridge, the edges of the channel are marked on the bridge with what lights?
Y a. Red lights N b. Three white lights in a vertical line N c. Red lights on the LDB and green lights on the RDB N d. Yellow lights 1673: Information about currents on the Pacific Coast of the U. S. is found in the __________.
N a. Nautical Almanac Y b. Tidal Current Tables N c. Ocean Current Tables N d. Tide Tables 1704: If the center of low pressure is due west of you in the Northern Hemisphere, which wind direction should you expect?
N a. South to west Y b. South to east N c. West to north N d. North to east 1709: The Beaufort scale is used to estimate the __________.
N a. wind direction N b. percentage of cloud cover Y c. wind speed N d. barometric pressure 1716: The hurricane season in the North Atlantic Ocean reaches its peak during the month of __________.
N a. June Y b. September N c. November N d. July 1737: You can determine if your vessel's position is in the dangerous or navigable semicircle of a hurricane by __________.
N a. observing whether the wind is veering or backing N b. plotting two or more recent storm positions from weather bulletins Y c. Both A and B N d. Neither A nor B 1797: A phenomenon where the atmospheric pressure is higher than that of other surrounding regions is called __________.
Y a. a high pressure area N b. a low front or an occluded front N c. the "trade winds" N d. the "doldrums" 1832: Which magnetic compass corrector(s) can be set while the vessel is on a heading of magnetic northeast or magnetic southeast?
N a. Flinders bar N b. Heeling magnets N c. Fore-and-aft magnets Y d. Quadrantal spheres 2002: What term is used to describe a river barge designed to carry coal or any similar cargo not requiring weather protection?
N a. Single skin N b. Double skin Y c. Open hopper N d. Deck barge 2044: What is the relative bearing of an object broad on the port quarter?
N a. 195° Y b. 225° N c. 240° N d. 265° 2062: The Illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter F in the illustration? (D038NG )
Y a. One red light N b. Two red lights N c. Two green lights N d. Three green lights 2238: A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 312°. What action should be taken to remove this error during compass adjustment?
N a. If the quadrantal spheres are all of the way out replace them with larger spheres. N b. If the quadrantal spheres are all of the way in replace them with larger spheres. Y c. If the quadrantal spheres are all of the way in, move the spheres out. N d. If the quadrantal spheres are all of the way out, move the spheres in. 2314: A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. What action should be taken to remove this error during compass adjustment?
N a. If the blue ends of the magnets are forward you should raise the fore-and-aft tray. N b. If the blue ends of the magnets are aft you should lower the fore-and-aft tray. Y c. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the top, you should add some magnets. N d. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the bottom, you should reverse the magnets. 2409: You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?
N a. Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach N b. Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges N c. Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. Y d. Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. 2416: An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol?
N a. Open-faced diamond Y b. Diamond with a cross N c. Circle N d. Square 2516: Apparent time is based on __________.
N a. a fictitious sun moving along the celestial equator Y b. the visible sun moving along the ecliptic N c. the Moon's motion in relation to the Sun N d. the movement of the first point of Aries 2528: Illustration D038NG represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter A in the illustration? (D038NG )
N a. One red light N b. Two red lights N c. Two green lights Y d. No light 2644: The sidereal day begins __________.
N a. when the sun is over the first point of Aries N b. when the first point of Aries is over 180° longitude Y c. when the first point of Aries is over the upper branch of the reference meridian N d. at 0000 on 1 January (Sidereal Date) 2826: You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?
N a. 356° Y b. 102° N c. 144° N d. 201° 2851: You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________.
N a. dead-reckoning position Y b. estimated position N c. running fix N d. fix 2870: Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.
N a. spring, around late evening N b. spring, around early evening Y c. fall, around early morning N d. fall, around midday 2931: The vertical distance from the tidal datum to the level of the water is the __________.
N a. range of tide Y b. height of tide N c. actual water depth N d. charted depth 3012: The draw span of a floating drawbridge may be marked with __________.
Y a. a yellow light showing Morse Code (B) N b. a yellow and white diamond N c. flashing blue lights N d. three red lights on each side of the draw 3081: The highest level of commercial navigational accuracy is provided by __________.
Y a. DGPS, within a coverage area N b. SPS, without selective availability N c. PPS, without selective availability N d. NAVSAT, using the Doppler-shift 3115: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?
Y a. Time stamp N b. Destination N c. Location of antenna N d. None of the above