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.
95: 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 minutes 134: The recording fathometer produces a graphic record of the __________.
N a. bottom contour only up to depths of 100 fathoms Y b. depth underneath the keel against a time base N c. contour of the bottom against a distance base N d. depth of water against a distance base 143: Under the IALA - A Buoyage System, a buoy used as a port hand mark would not show which light characteristic?
N a. Isophase N b. Quick flashing N c. Long flashing Y d. Group Flashing (2 + 1) 215: The equation of time is 12m 00s and the mean Sun is ahead of the apparent Sun. If you are on the central meridian of your time zone, at what zone time will the apparent Sun cross the meridian?
N a. 1148 N b. 1200 Y c. 1212 N d. It cannot be determined from the information given. 222: Which statement concerning the illustration is correct? (Soundings and heights are in meters) (D010NG )
N a. Maury Lightship swings about her anchor on a circle with a 21-meter diameter. N b. The position of the lightship is indicated by the center of the star on the symbol's mast. N c. There is a 12 meter deep hole inside the 5-meter curve just west of Beito Island. Y d. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. 245: Yesterday you took a time tick using the 1200 GMT broadcast, and the chronometer read 11h 59m 59s. Today at the 1200 GMT time tick the chronometer read 00h 00m 01s. What is the chronometer error?
N a. Gaining 2 seconds N b. Losing 2 seconds N c. Fast 2 seconds Y d. Fast 1 second 391: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
N a. a junction with the preferred channel to the left N b. a sharp turn in the channel to the right Y c. the port side of the channel N d. a wreck to be left on the vessel's starboard side 518: With regard to GPS, a civilian receiver may be capable of achieving the same accuracy as a military receiver if __________.
Y a. selective availability is set to zero N b. the satellites are all below 15° in elevation N c. your vessel is equipped with a Doppler receiver N d. the horizontal dilution of precision is high 551: Spoil grounds, anchorage areas, cable areas, and military exercise areas are all marked by yellow buoys. Which special mark on the buoy will indicate the specific area you are in?
N a. A topmark triangular in shape N b. A topmark spherical in shape Y c. Lettering on the buoy N d. A topmark consisting of two cones with the points up 552: A Mercator chart is a __________.
Y a. cylindrical projection N b. simple conic projection N c. polyconic projection N d. rectangular projection 554: A sling psychrometer is a(n) __________.
N a. type of cargo gear N b. instrument used in celestial navigation Y c. instrument used to measure relative humidity N d. instrument used to measure specific gravity 555: The letter D shown represents the __________. (D006NG )
N a. geoidal horizon N b. celestial horizon N c. visible horizon Y d. geometrical horizon 603: What is the approximate wave length of an X Band Radar operating on a frequency of approximately 9500 MHz?
Y a. 3 cm N b. 10 cm N c. 30 cm N d. 100 cm 624: When using a mechanical (windup type) marine chronometer, how often should it be reset?
Y a. Only when it is overhauled N b. Whenever the chronometer error exceeds approximately four minutes N c. At the start of each voyage N d. If the chronometer rate changes from gaining to losing or vice versa 669: It is desirable that a vessel encountering hurricane or typhoon conditions sends weather reports to the closest meteorological service at least every __________.
N a. hour Y b. 3 hours N c. 6 hours N d. 8 hours 707: Set of the current is __________.
N a. its velocity in knots N b. direction from which it flows N c. estimated current Y d. direction towards which it flows 722: Which publication would describe the explosive anchorages in the ports on the east coast of the United States?
N a. Sailing Directions N b. Pilot Rules for Inland Waters Y c. Coast Pilot N d. Notice to Mariners 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. 869: Tropical storms and hurricanes are most likely to form in the Southern hemisphere during __________.
Y a. January through March N b. April through May N c. June through August N d. September through November 913: How many points are there in a compass card?
N a. 4 N b. 8 N c. 24 Y d. 32 920: What is the average speed of the movement of a hurricane following the recurvature of its track?
N a. 5 to 10 knots Y b. 20 to 30 knots N c. 40 to 50 knots N d. Over 60 knots 984: The bases of middle clouds are located at altitudes of between __________.
N a. 3,000 to 6,500 feet (914 to 1981 meters) Y b. 6,500 to 20,000 feet (1981 to 6096 meters) N c. 10,000 to 35,000 feet (3048 to 10,668 meters) N d. 20,000 to 60,000 feet (6096 to 18,288 meters) 1008: The Light List indicates that a light has a nominal range of 18 miles and is 38 feet high. If the visibility is 6 miles and your height of eye is 15 feet, at which distance will you sight the light?
N a. 18.0 nm N b. 14.8 nm Y c. 11.7 nm N d. 6.0 nm 1066: The slope of a warm front is about __________.
N a. 1 mile vertically to 10 miles horizontally N b. 1 mile vertically to 50 miles horizontally Y c. 1 mile vertically to 150 miles horizontally N d. 1 mile vertically to 500 miles horizontally 1074: As the temperature for a given mass of air increases, the __________.
N a. dew point increases N b. dew point decreases N c. relative humidity increases Y d. relative humidity decreases 1098: A chart position enclosed by a square is a(n) __________.
N a. fix Y b. estimated position N c. dead reckoning position N d. running fix 1128: In 1981, when would Jupiter and Saturn be visible in temperate latitudes for both evening and morning stars?
N a. 10 January Y b. 27 March N c. 22 June N d. 8 October 1234: Which information does the outer ring of a compass rose on a nautical chart provide?
N a. Variation Y b. True directions N c. Magnetic directions N d. Annual rate of variation change 1283: The error in a magnetic compass caused by the vessel's magnetism is called __________.
N a. variation Y b. deviation N c. compass error N d. bearing error 1330: You are located within a stationary high pressure area. Your aneroid barometer is falling very slowly. This indicates a(n) __________.
N a. wind shift of 180° N b. large increase in wind velocity Y c. decrease in the pressure of the system N d. increase in the intensity of the system 1339: You are on course 303°T. To check the speed of your vessel you should observe a celestial body on which bearing?
N a. 000° N b. 090° Y c. 123° N d. 213° 1352: Weather observations provided by each weather station include all of the following except __________.
N a. temperature N b. visibility Y c. predicted weather for the next twelve hours N d. barometric pressure and change in the last three hours 1373: The reaction of a gyrocompass to an applied force is known as __________.
Y a. precession N b. earth rate N c. gyroscopic inertia N d. gravity effect 1384: Which type of cloud is indicated by number 9? (D039NG )
N a. Cumulus Y b. Cumulonimbus N c. Altostratus N d. Stratocumulus 1430: The Light List indicates that a light has a nominal range of 14 miles and is 42 feet high (12.8 meters). If the visibility is 6 miles and your height of eye is 20 feet (6.1 meters), at what approximate distance will you sight the light?
N a. 20.1 miles Y b. 10.0 miles N c. 7.6 miles N d. 6.0 miles 1457: What is the period of time from around 1008 DST (ZD +4) at Canapitsit Channel, MA, on 7 August 1983, in which the current does not exceed 0.4 knot?
N a. 0945 to 1031 N b. 0950 to 1026 Y c. 0955 to 1021 N d. 1000 to 1024 1483: The most accurate method of determining gyrocompass error while underway is by __________.
Y a. comparing the gyro azimuth of a celestial body with the computed azimuth of the body N b. comparing the gyro heading with the magnetic compass heading N c. determining from the chart the course made good between celestial fixes N d. It cannot be determined accurately at sea due to drift of unknown currents. 1565: Determine the approximate geographic visibility of an object, with a height above the water of 85 feet (25.9 meters), for an observer with a height of eye of 60 feet (18.3 meters).
N a. 18.4 nm Y b. 19.9 nm N c. 20.8 nm N d. 21.5 nm 1600: Zenith distance is equal to __________.
Y a. 90° - Ho N b. 90° - d N c. Ho° + d N d. 90° - z 1617: The inner cloud bands of a hurricane, when viewed from a distance, form a mass of dense, black cumulonimbus clouds called the __________.
Y a. bar of the storm N b. eye of the storm N c. funnel N d. front 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 1840: A vessel heading NW is on a course of __________.
N a. 274.5° N b. 292.5° Y c. 315.0° N d. 337.5° 1879: A chart projection depicting the poles and a small area on either side of a connecting meridian, that is sometimes used for star charts, is the __________.
N a. azimuthal gnomonic projection N b. Lambert conformal projection Y c. transverse Mercator projection N d. polyconic projection 1906: In the horizon system of coordinates what is equivalent to latitude on the Earth?
Y a. Altitude N b. Zenith N c. Declination N d. Zenith distance 2145: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
N a. Green over red N b. Red over blue N c. Green over amber (yellow) Y d. Red over amber (yellow) 2243: Which aid is NOT marked on a chart with a magenta circle?
N a. Radar station N b. Radar transponder beacon Y c. Aero light N d. Radio beacon 2294: What celestial body may sometimes be observed in daylight?
N a. New Moon N b. Saturn N c. Sirius Y d. Venus 2442: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic north but the compass reads 004°. You should now adjust the compass until it reads __________.
N a. 356° N b. 358° N c. 000° Y d. 002° 2460: You are on course 344°T and take a relative bearing of a lighthouse of 270°. What is the true bearing to the lighthouse?
N a. 016° N b. 074° N c. 090° Y d. 254° 2482: When a vessel changes course from one cardinal heading to another cardinal heading while adjusting the compass, which action should be taken?
N a. The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings. Y b. After the new heading is reached, the vessel should steam on that course for at least two minutes before the adjustment. N c. During the course change, you should gently tap the compass to remove any error caused by friction on the pivot bearing. N d. After steadying on the new heading, the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error. 2488: In which publication could you find information concerning the minimum lighting required for bridges on U.S. waters?
N a. Chart No. 1. Y b. Code of Federal Regulations N c. Mississippi River Systems Light List N d. Notice to Mariners 2600: A parallel of latitude other than the equator is a __________.
N a. great circle N b. loxodromic curve Y c. small circle N d. gnomonic curve 2606: The measurement of local time is based on the passage of the Sun over the __________.
N a. upper branch of the observer's meridian Y b. lower branch of the observer's meridian N c. upper branch of the Greenwich meridian N d. lower branch of the Greenwich meridian 2646: During daylight savings time the meridian used for determining the time is located farther __________.
Y a. east N b. west N c. east in west longitude and west in east longitude N d. west in west longitude and east in east longitude 2726: A daymark used as a special mark is indicated by which letter in the diagram? (D045NG )
N a. A Y b. B N c. C N d. D 2849: You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix?
Y a. 000° N b. 066° N c. 112° N d. 271° 2895: A white buoy with an orange rectangle on it is a(n) __________.
N a. junction buoy N b. safe water buoy Y c. informational buoy N d. All of the above 2918: Which agency maintains federal aids to navigation?
N a. Corps of Engineers Y b. Coast Guard N c. National Ocean Service N d. Maritime Administration 2960: What is NOT found in the Mississippi River System Light List?
Y a. Distance that a lighted aid to navigation can be seen at night N b. Distance between major points on the Mississippi River N c. A color plate showing the details of the aids to navigation used on the Mississippi River N d. Times of Coast Guard broadcasts concerning river stages 3057: IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________.
Y a. green conical buoy N b. green can buoy N c. red can buoy N d. red conical buoy