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.
68: A position obtained by taking lines of position from one object at different times and advancing them to a common time is a(n) __________.
N a. dead-reckoning position N b. estimated position N c. fix Y d. running fix 138: The path that a vessel is expected to follow, represented on a chart by a line drawn from the point of departure to the point of arrival, is the __________.
N a. DR plot Y b. track line N c. heading N d. estimated course 151: Under the U.S. Aids to Navigation System, spherical buoys may be __________.
N a. numbered Y b. lettered N c. lighted N d. All of the above 158: Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, the current could be __________.
N a. with you at 10 knots N b. against you at 10 knots Y c. slack N d. with you at 2 knots 185: A ship is in longitude 54°00'W on a true course of 270°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?
N a. 45°00'W N b. 52°30'W N c. 60°00'W Y d. 67°30'W 265: It is 1200 local time for an observer at 54°E longitude. Which statement is TRUE?
N a. It is afternoon at Greenwich. N b. It is midnight at 126°E longitude. Y c. The observer is in time zone -4. N d. All of the above are true. 275: Which statement concerning illustration is correct? (Soundings and heights are in meters) (D010NG )
Y a. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. N b. There is a 12-meter deep hole inside the 5-meter curve just west of Beito Island. N c. The position of the lightship is indicated by the center of the star on the symbol's mast. N d. Maury Lightship swings about her anchor on a circle with a 21-meter diameter. 284: The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator. An error NOT correctable by the navigator is __________.
N a. index error Y b. prismatic error N c. perpendicularity of the horizon glass N d. perpendicularity of the index mirror 293: 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 pulses 328: The direction of prevailing winds in the Northern hemisphere is caused by the __________.
N a. magnetic field at the North Pole N b. Gulf Stream Y c. Earth's rotation N d. Arctic cold fronts 341: Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?
N a. Flashing N b. Quick flashing Y c. Composite group flashing N d. Equal interval (isophase) 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. 446: The usual sequence of directions in which a tropical cyclone moves in the Southern Hemisphere is __________.
N a. northwest, west, and south Y b. southwest, south, and southeast N c. north, northwest, and east N d. west, northwest, and north 469: Where are the prevailing westerlies of the Southern Hemisphere located?
N a. Between the Equator and 10° latitude N b. Between 10° and 20° latitude Y c. Between 30° and 60° latitude N d. Between 60° and 90° latitude 499: Which of the symbols shown represents an occluded front? (D018NG )
N a. A N b. B N c. C Y d. D 558: A buoy bears 176°T at 3000 yards. What is the course to make good to leave the buoy 100 yards to starboard?
Y a. 174°T N b. 176°T N c. 178°T N d. 180°T 619: According to Buys Ballot's Law, when an observer in the Southern Hemisphere experiences a northwest wind, the center of the low pressure is located to the __________.
N a. east-northeast Y b. south-southwest N c. east-southeast N d. west-southwest 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 vessel 686: The pressure gradient between the horse latitudes and doldrums runs __________.
N a. east to west Y b. north to south N c. northeast to southwest N d. northwest to southeast 737: What describes an ebb current?
N a. Horizontal movement of the water away from the land following low tide N b. Horizontal movement of the water toward the land following low tide Y c. Horizontal movement of the water away from the land following high tide N d. Horizontal movement of the water toward the land following high tide 768: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
Y a. wind circulation and forward motion of the storm N b. extension of the low pressure ridge N c. recurvature effect N d. direction of circulation and pressure gradient 775: A sidereal day is shorter than a solar day. This difference is due to __________.
N a. irregularities in the daily rotational rate of the Sun N b. the space motion of the solar system N c. the precession of the equinoxes Y d. the use of different reference points 786: The greater the pressure difference between a high and a low pressure center, the __________.
N a. dryer the air mass will be N b. cooler the temperature will be Y c. greater the force of the wind will be N d. warmer the temperature will be 799: In Region A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________.
N a. green can buoy N b. red can buoy Y c. green conical buoy N d. red conical buoy 809: The compass rose on a nautical chart indicates both variation and __________.
N a. deviation Y b. annual rate of variation change N c. precession N d. compass error 885: The daily path of a celestial body that is parallel to the celestial equator is the __________.
N a. altitude circle N b. vertical circle Y c. diurnal circle N d. hour circle 885: The daily path of a celestial body that is parallel to the celestial equator is the __________.
N a. altitude circle N b. vertical circle Y c. diurnal circle N d. hour circle 892: When a buoy is in position only during a certain period of the year, where may the dates when the buoy is in position be found?
Y a. Light List N b. Notice to Mariners N c. On the chart N d. Coast Pilot 945: What is NOT a side of the navigational triangle used in sight reduction?
Y a. Altitude N b. Zenith distance N c. Colatitude N d. Polar distance 965: In order for a star to be used for a sight at lower transit, the star must __________.
Y a. be circumpolar N b. have a declination equal to or greater than your latitude N c. have a GHA of 180° N d. have the SHA equal to or less than the LHA 975: The change in the length of the day becomes greater as latitude increases because of the __________.
N a. path of the ecliptic relative to the equator N b. decreasing distance between meridians N c. changing distance between the Earth and the Sun Y d. increased obliquity of the Sun's diurnal circle 992: Which publication contains information on Naval Control of Shipping (NCS) in time of emergency or war?
Y a. Pub. 117, Radio Navigational Aids N b. Appropriate volume of the Sailing Directions N c. Pub. 102, International Code of Signals N d. Light List 1050: The passing of a low pressure system can be determined by periodically checking the __________.
N a. thermometer N b. hygrometer Y c. barometer N d. anemometer 1064: The dew point temperature is __________.
N a. always higher than the air temperature N b. always lower than the air temperature N c. equal to the difference between the wet and dry bulb temperatures Y d. the temperature at which the air is saturated with water vapor 1108: Preferred channel buoys indicate the preferred channel to transit by __________.
N a. odd or even numbers Y b. the color of their top band N c. the location of the buoy in the channel junction N d. the buoy's light rhythms 1157: How many slack tidal currents usually occur each day on the east coast of the United States?
N a. One N b. Two N c. Three Y d. Four 1188: The magnitude of three stars is indicated. Which star is the brightest?
N a. Antares + 1.2 N b. Altair + 0.9 Y c. Vega + 0.1 N d. Cannot be determined; magnitude indicates size not brightness 1239: While taking weather observations, you determine that the wind is blowing from the northeast. You would record the wind direction in the weather log as __________.
Y a. 045° N b. 090° N c. 135° N d. 225° 1259: General information on enroute weather and climate is found in __________.
Y a. the Sailing Directions and the Coast Pilot N b. a weather fax N c. the Local Notice to Mariners N d. the Light List 1358: Despite weather predictions for continued good weather, a prudent mariner should be alert for all of the following, EXCEPT a sudden __________.
N a. drop in barometric pressure Y b. drop in temperature N c. wind shift N d. squall line 1429: A celestial body will cross the prime vertical circle when the latitude is numerically __________.
Y a. greater than the declination and both are of the same name N b. less than the declination and both are of the same name N c. greater than the declination and both are of contrary name N d. less than the declination and both are of contrary name 1539: 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. 1657: Fog is formed when __________.
N a. the moisture in the air is condensed into small droplets N b. air is cooled to its dew point N c. the base of a cloud is on the ground Y d. All of the above 1784: If your vessel were proceeding down river (descending), a green square marker with a green reflector border on the right bank would be a __________.
N a. mile board N b. dredging mark Y c. passing daymark N d. crossing daymark 1804: 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 above 1807: Which weather system produces strong cold winds called "Northers" during the winter months in the Gulf of Mexico?
N a. A polar maritime air mass Y b. A high pressure system N c. A cyclone N d. A low pressure system 1926: The prime vertical is the great circle on the celestial sphere that passes through the __________.
N a. celestial poles and the zenith Y b. zenith, nadir and the east point of the horizon N c. celestial poles and the celestial body N d. zenith, nadir and celestial body 1936: The parallel of latitude at 66°33'N is the __________.
N a. Tropic of Cancer N b. Tropic of Capricorn Y c. Arctic Circle N d. ecliptic 1942: In the horizon system of coordinates what is equivalent to the declination of the equator system?
N a. Nadir N b. Azimuth angle Y c. Altitude N d. Zenith distance 2056: This illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter C? (D038NG )
N a. One red light Y b. Two green lights N c. Three green lights N d. No lights 2165: The illustration represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at B if the lock walls and piers are not awash? (D037NG )
Y a. Three red lights N b. Two red lights N c. One red light N d. One amber light 2180: Relative humidity is defined as __________.
N a. the maximum vapor content the air is capable of holding N b. the minimum vapor content the air is capable of holding Y c. the ratio of the actual vapor content at the current temperature to the air's vapor holding capability N d. the relation of the moisture content of the air to barometric pressure 2181: Diagram Number D037NG represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at D if the lock walls and piers are not awash?
Y a. One red light N b. Two red lights N c. Three red lights N d. No lights 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. 2340: What is a "Special Warning"?
N a. An urgent message concerning a vessel in distress N b. A weather advisory about unusual meteorological or oceanographic phenomena hazardous to vessels Y c. A broadcast disseminating an official government proclamation affecting shipping N d. A radio navigational warning concerning a particularly hazardous condition affecting navigation 2396: Perihelion is the point where the Sun __________.
Y a. is nearest to the Earth N b. is farthest from the Earth N c. is on the opposite side of the Earth from the Moon N d. and Moon and Earth are in line 2440: You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse?
N a. 003° N b. 227° Y c. 177° N d. 363° 2729: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 5.5 seconds after the signal was sounded. What is the distance to the shore?
N a. 3825 ft (1166 meters) N b. 3450 ft (1052 meters) Y c. 3072 ft (936 meters) N d. 2475 ft (754 meters) 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 2998: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 3 1/2 seconds after the signal was sounded. What is the distance to the shore?
Y a. 640 yards N b. 480 yards N c. 315 yards N d. 143 yards