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 above95: The difference in local time between an observer on 114°W and one on 119°W is __________.
N a. 1.25 minutes N b. 5 minutes Y c. 20 minutes N d. 75 minutes136: Which Beaufort force indicates a wind speed of 65 knots?
N a. Beaufort force 0 N b. Beaufort force 6.5 Y c. Beaufort force 12 N d. Beaufort force 15168: Your vessel is making way through the water at a speed of 12 knots. Your vessel traveled 30 nautical miles in 2 hours 20 minutes. What current are you experiencing?
N a. A following current at 2.0 knots N b. A head current of 2.0 knots Y c. A following current of 0.9 knot N d. A head current of 0.9 knot202: On charts of U.S. waters, a magenta marking is NOT used for marking a __________.
N a. radio beacon N b. lighted buoy N c. prohibited area Y d. 5-fathom curve241: A spherical buoy may be __________.
N a. numbered Y b. lettered N c. green N d. red276: The region of high pressure extending around the Earth at about 35°N latitude is called the __________.
N a. prevailing westerlies Y b. horse latitudes N c. troposphere N d. doldrums293: The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of __________.
N a. high frequency pulses N b. combinations of high and low frequency pulses Y c. the same frequency for all stations in a chain N d. varied long and short pulses344: A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has __________.
N a. error of perpendicularity Y b. side error N c. prismatic error N d. centering error431: When a buoy marks a channel bifurcation, the preferred channel is NOT indicated by __________.
N a. the shape of an unlighted buoy N b. the light color of a lighted buoy N c. the color of the topmost band Y d. whether the number is odd or even444: A sylphon cell is a part of a __________.
N a. maximum thermometer Y b. barograph N c. thermograph N d. hygrometer454: On what does the operation of an aneroid barometer depend?
Y a. Thin, metal, air tight cell N b. Curved tube containing alcohol N c. Column of mercury supported by atmospheric pressure N d. Expansion of mercury in a closed tube502: A gnomonic projection is based on a(n) __________.
Y a. plane tangent at one point N b. cylinder tangent at the equator N c. cone tangent at one parallel N d. infinite series of cones tangent at selected parallels544: The instrument most commonly used to gather the data for determining the relative humidity is the __________.
N a. hydrometer Y b. psychrometer N c. barometer N d. anemometer544: The instrument most commonly used to gather the data for determining the relative humidity is the __________.
N a. hydrometer Y b. psychrometer N c. barometer N d. anemometer552: A Mercator chart is a __________.
Y a. cylindrical projection N b. simple conic projection N c. polyconic projection N d. rectangular projection562: You wish to measure the distance on a Mercator chart between a point in latitude 42°30'N and a point in latitude 40°30'N. To measure 30 miles at a time you should set the points of the dividers at __________.
Y a. 41°15' and 41°45' N b. 41°45' and 42°15' N c. 42°15' and 42°45' N d. 42°00' and 42°30'649: You are on course 226°T. In order to check the latitude of your vessel, you should observe a celestial body on which bearing?
N a. 226° N b. 270° Y c. 000° N d. 026°683: A radar contact will remain stationary on a relative motion radar display only when it is __________.
N a. on the same course as your vessel N b. at the same speed as your vessel Y c. on the same course and speed as your vessel N d. on a reciprocal course at the same speed as your vessel793: The permanent magnetism of a vessel may change in strength due to __________.
N a. a collision with another vessel N b. being moored on a constant heading for a long period of time N c. being struck by lightning Y d. All of the above793: The permanent magnetism of a vessel may change in strength due to __________.
N a. a collision with another vessel N b. being moored on a constant heading for a long period of time N c. being struck by lightning Y d. All of the above820: A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) __________.
N a. dead-reckoning position Y b. running fix N c. estimated position N d. fix834: In many areas "atoll" clouds (clouds of vertical development) are produced over small islands. These are the result of __________.
Y a. rising air currents produced by the warm islands N b. warm air from the sea rising over higher land areas N c. cool land air mixing with warm sea air N d. descending air over the islands836: In North America the majority of the weather systems move from __________.
N a. north to south N b. south to north N c. east to west Y d. west to east871: Under the IALA-A Buoyage System, a buoy marking the starboard side of the channel when approaching from seaward must have a(n) __________.
N a. pillar shape Y b. green color N c. square topmark N d. even number1004: A low, uniform layer of cloud resembling fog, but not resting on the ground, is called __________.
N a. cumulus N b. nimbus Y c. stratus N d. cirrus1243: Magnetic heading differs from compass heading by __________.
N a. compass error N b. true heading N c. variation Y d. deviation1340: The annual change in variation for an area can be found in __________.
N a. the handbook for Magnetic Compass Adjustment, Pub 226 Y b. the center of the compass rose on a chart of the area N c. the compass deviation table N d. Variation does not change.1378: The latitude of the upper vertex of a great circle is 36°N. What is the latitude of the lower vertex?
N a. 36°N N b. 0° Y c. 36°S N d. Cannot be determined from the information given1460: What is the major advantage of a rhumb line track?
Y a. The vessel can steam on a constant heading (disregarding wind, current, etc.). N b. The rhumb line is the shortest distance between the arrival and departure points. N c. It is easily plotted on a gnomonic chart for comparison with a great circle course. N d. It approximates a great circle on east-west courses in high latitudes.1494: Cirrocumulus clouds are indicated by which number? (D039NG )
N a. 7 N b. 5 Y c. 3 N d. 11539: You are steaming in the open ocean of the North Pacific between the Aleutian Chain and Hawaii. A warning broadcast indicates that an earthquake has occurred in the Aleutians and has generated a tsunami that is predicted to hit Hawaii. What action is necessary for the ship's safety?
N a. Calculate the tsunami's ETA at your position and turn to a course that will head into the Tsunami. N b. Securely stow all loose gear, check deck lashings, and prepare for extreme rolls. Y c. No special action as tsunamis are inconspicuous in the open ocean N d. Prepare for sudden, high-velocity wind gusts from rapidly changing directions.1567: Buoys and day beacons exhibiting a yellow triangle or square painted on them are used __________.
N a. in minor harbors where the controlling depth is 10 feet (3 meters) or less N b. on isolated stretches of the ICW to mark undredged areas Y c. where the ICW and other waterways coincide N d. at particularly hazardous turns of the channel1578: The LMT of sunrise on the standard meridian is 0552. Your longitude is 99°15'E. What is your ZT of sunrise?
N a. 0512 N b. 0529 N c. 0552 Y d. 06151585: The sidereal day begins when the __________.
Y a. first point of Aries is over the upper branch of the reference meridian N b. Sun is over the lower branch of the reference meridian N c. Sun is over the upper branch of the reference meridian N d. first point of Aries is over the lower branch of the reference meridian1586: A green buoy has a yellow triangle on it. This is a(n) __________.
N a. information or regulatory buoy that has lateral significance N b. buoy that is off-station and is marked to warn mariners of its wrong position Y c. dual purpose marking used where the ICW and other waterways coincide N d. buoy that was set in error and will be replaced with a red nun buoy1684: Which type of frontal passage is associated with a relatively narrow band of precipitation?
Y a. A cold front N b. A warm front N c. A stationary front N d. None of the above1745: When your vessel is on the storm track but behind the storm's center the __________.
N a. wind direction remains steady N b. wind speed decreases N c. barometer rises Y d. All of the above1804: Magnetic information on a chart may be __________.
N a. found in the center(s) of the compass rose(s) N b. indicated by isogonic lines N c. found in a note on the chart Y d. All of the above1806: Sometimes foreign charts are reproduced by NGA (NIMA). On such a chart a wire dragged (swept) area may be shown in purple or __________.
Y a. green N b. red N c. magenta N d. yellow1815: Which weather system produces strong cold winds called "Northers" during the winter months in the Gulf of Mexico?
Y a. An anticyclone N b. A polar maritime air mass N c. A cyclone N d. A low pressure system1949: "Revolution" is the __________.
N a. wobbling of the Earth about its axis N b. motion of bodies in the solar system relative to the stars Y c. motion of a celestial body in its orbit N d. spinning of a celestial body about its axis2040: A vessel heading NNE is on a course of __________.
Y a. 022.5° N b. 045.0° N c. 067.5° N d. 090.0°2053: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
N a. a sharp turn in the channel to the right Y b. the port side of the channel N c. a junction with the preferred channel to the left N d. a wreck to be left on the vessel's starboard side2067: The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 5 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
Y a. 6.3 miles N b. 7.4 miles N c. 8.4 miles N d. 9.0 miles2115: Vessels regularly navigating rivers above Cairo, Illinois, shall at all times have on board a copy of __________.
Y a. U.S. Army Corps of Engineers Regulations (Blue Book) N b. Light List Vol. V N c. U.S. Coast Pilot N d. None of the above2232: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. Which action should be taken to remove this error during compass adjustment?
N a. If the red ends are to starboard you should raise the athwartships tray. Y b. If the red ends are to starboard, and the athwartships tray is at the bottom, you should remove some magnets. N c. If the red ends are to port, and the athwartships tray is at the top, you should reverse the magnets. N d. If the red ends are to port, and the athwartships tray is at the top, you should lower the tray.2246: The speed of an ocean current is dependent on __________.
Y a. the density of the water N b. the air temperature N c. the presence of a high pressure area near it N d. underwater soil conditions2328: Universal time (UTI) is another name for __________.
N a. sidereal time Y b. Greenwich mean time N c. ephemeris time N d. atomic time2375: The shortest distance between any two points on earth defines a __________.
N a. small circle Y b. great circle N c. rhumb line N d. hyperbola2498: The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers for lights on __________.
Y a. the right descending bank N b. the left descending bank N c. preferred channel buoys N d. daymarks with no lateral significance2688: The 10-cm radar as compared to a 3-cm radar of similar specifications will __________.
N a. be more suitable for river and harbor navigation N b. provide better range performance on low lying targets during good weather and calm seas Y c. have a wider horizontal beam width N d. have more sea return during rough sea conditions2722: The paths of intended travel between three or more points is the __________.
N a. course Y b. track N c. bearing N d. course over the ground2764: You are in a channel inbound from sea. A daymark used to mark a channel junction when the preferred channel is to port will have the shape indicated by what letter in illustration D045NG?
N a. A N b. B N c. C Y d. D2821: The height of tide is the __________.
N a. difference between the depth of the water at high tide and the depth of the water at low tide N b. depth of water at a specific time due to tidal effect Y c. difference between the depth of the water and the area's tidal datum N d. difference between the depth of the water and the high water tidal level2831: A coastal chart could have a scale of __________.
N a. not more than 1:25,000 N b. 1:35,000 Y c. 1:100,000 N d. 1:500,0002844: The signal from a ramark will show on the PPI as a __________.
N a. coded signal on the same bearing and at a greater range then the transponder N b. circle surrounding the transponder Y c. radial line from the transponder to the center of the PPI N d. dashed circle at the same range as the transponder2924: You take a bearing of 264° of a lighthouse. What bearing of another object would give the best fix?
N a. 289° Y b. 350v N c. 081° N d. 120°2941: During daylight savings time the meridian used for determining the time is located farther __________.
N a. west in west longitude and east in east longitude N b. east in west longitude and west in east longitude Y c. east N d. west3028: The channel under a bridge is marked with aids from the lateral system. The centerline of the channel is marked on the bridge with __________.
N a. a yellow triangle N b. three white lights N c. a black-and-white diamond Y d. a red-and-white octagon