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.
37: What does the term "tide" refer to?
N a. Horizontal movement of the water Y b. Vertical movement of the water N c. Mixing tendency of the water N d. Salinity content of the water 42: The datum used for soundings on charts of the East Coast of the United States is __________.
N a. mean low water springs N b. mean low water Y c. mean lower low water N d. half tide level 292: The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic does the light possess?
N a. It is visible two nautical miles. N b. Its distinguishing number is "19M". Y c. It has a red light. N d. It flashes once every ten seconds. 304: In order to remove index error from a sextant, you should adjust the __________.
N a. index mirror to make it parallel to the horizon glass with the index set at zero Y b. horizon glass to make it parallel to the index mirror with the index set at zero N c. horizon glass to make it parallel to the sextant frame N d. telescope to make it perpendicular to the sextant frame 336: You are steaming eastward in the North Atlantic in an extratropical cyclonic storm and the wind is dead ahead. According to the law of Buys Ballot, the center of the low pressure lies __________.
N a. ahead of you N b. astern of you N c. to the north Y d. to the south 363: Your dead reckoning position should be plotted __________.
N a. whenever an estimated position is plotted N b. when it agrees with your loran position N c. when coming on or going off soundings Y d. at least every hour on the hour in the open waters of the sea 388: You are underway on course 120°T and your maximum speed is 12 knots. The eye of a hurricane bears 150°T, 120 miles from your position. The hurricane is moving towards 295°T at 20 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?
N a. 89 miles N b. 96 miles N c. 105 miles Y d. 117 miles 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 485: A phase correction is applied to observations of __________.
N a. the Sun N b. stars Y c. planets N d. All of the above 526: When a hurricane passes over colder water or land and loses its tropical characteristics, the storm becomes a(n) __________.
N a. high pressure area Y b. extratropical low-pressure system N c. tropical storm N d. easterly wave 536: You are enroute from Puerto Rico to New York. A hurricane makes up and is approaching. If the wind veers steadily, this indicates that your vessel is __________.
Y a. in the dangerous semicircle N b. in the navigable semicircle N c. directly in the path of the storm N d. in the storm center 591: White lights may be found on __________.
N a. special purpose buoys N b. preferred channel buoys Y c. information and regulatory buoys N d. numbered buoys 602: Between the equator and the 46th parallel of latitude, there are 3099 meridional parts. How many degrees of equatorial longitude does 3099 meridional parts represent?
N a. 35°52'45" Y b. 51°39'00" N c. 74°21'11" N d. 82°36'12" 730: In the Northern Hemisphere, the largest waves or swells created by a typhoon or hurricane will be located __________.
N a. in the southeast quadrant of the storm N b. directly behind the storm center Y c. forward and to the right of its course N d. behind and to the left of its course 732: What publication has information on the climate, distances, navigation regulations, outstanding landmarks, channels and anchorages of Long Island Sound?
N a. Light List Y b. Coast Pilot N c. Sailing Directions N d. Pilot Chart 773: What is the basic principle of the magnetic compass?
Y a. Magnetic materials of the same polarity repel each other and those of opposite polarity attract. N b. The Earth's magnetic lines of force are parallel to the surface of the Earth. N c. Magnetic meridians connect points of equal magnetic variation. N d. The compass needle(s) will, when properly compensated, lie parallel to the isogonic lines of the Earth. 773: What is the basic principle of the magnetic compass?
Y a. Magnetic materials of the same polarity repel each other and those of opposite polarity attract. N b. The Earth's magnetic lines of force are parallel to the surface of the Earth. N c. Magnetic meridians connect points of equal magnetic variation. N d. The compass needle(s) will, when properly compensated, lie parallel to the isogonic lines of the Earth. 821: In addition to monitoring channel 16, all Corps of Engineer locks may use as working channels __________.
N a. 06, 12 and 22A N b. 01A, 05A and 07A Y c. 12, 13 and 14 N d. 14, 24 and 28 851: You would expect to find channels marked with the IALA-A Buoyage System in __________.
N a. the Philippines Y b. Australia N c. Republic of Korea N d. Chile 875: Sidereal hour angle is always __________.
N a. measured westward from the hour circle containing the first point of Aries N b. measured from the point on the celestial sphere occupied by the Sun at the vernal equinox N c. subtracted from the LHA of the star to obtain the LHA of Aries Y d. All of the above 906: In the Northern Hemisphere, an area of counterclockwise wind circulation surrounded by higher pressure is a __________.
Y a. low N b. high N c. warm front N d. cold front 908: From LAT 07°12'N, LONG 80°00'W, to LAT 47°12'S, LONG 169°18'E, the initial great circle course angle is 137.25°. How would you name this course?
N a. N 137.25°E N b. S 137.25°E Y c. N 137.25°W N d. S 137.25°W 1016: A source of an air mass labeled mTw is __________.
N a. the equator Y b. the Gulf of Mexico N c. Alaska N d. Canada 1048: The velocity of the current in large coastal harbors is __________.
N a. unpredictable N b. generally too weak to be of concern Y c. predicted in Tidal Current Tables N d. generally constant 1181: An occulting light is one in which __________.
N a. the period of darkness exceeds the period of light N b. there is only a partial eclipse of the light N c. the periods of light and darkness are equal Y d. the period of light exceeds the period of darkness 1250: Daylight savings time is a form of zone time that adopts the time __________.
Y a. one zone to the east N b. one zone to the west N c. two zones to the east N d. two zones to the west 1286: Which condition will occur after a cold front passes?
N a. Temperature rises N b. Stratus clouds form N c. Pressure decreases Y d. Humidity decreases 1343: Variation is a compass error that you __________.
N a. can correct by adjusting the compass card N b. can correct by adjusting the compensating magnets N c. can correct by changing the vessel's heading Y d. cannot correct 1434: What is NOT a characteristic of cardinal marks?
N a. Yellow and black bands N b. White lights Y c. Square or triangular topmarks N d. Directional orientation to a hazard 1448: Spring tides occur when the __________.
N a. Moon is in its first quarter or third quarter phase N b. Sun and Moon are in quadrature N c. Moon's declination is maximum and opposite to that of the Sun Y d. Moon is new or full 1626: Which instrument is used to measure the relative humidity of the air?
N a. A hydrometer Y b. A hygrometer N c. A spectrometer N d. A barograph 1642: Which type of cloud formation should be of immediate concern to small craft operators?
N a. cirrus N b. altostratus N c. nimbostratus Y d. cumulonimbus 1688: Which type of front forms when a cold front overtakes and forces a warm front upwards?
N a. A cold front Y b. An occluded front N c. A warm front N d. A stationary front 1723: The intensity of a hurricane as it reaches higher latitudes and cooler waters __________.
N a. Increases N b. remains the same Y c. decreases N d. None of the above 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" 1852: When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________.
Y a. 90° - Ho N b. 180° - GHA N c. GHA - LHA N d. z - d 1884: If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?
N a. 1648 fathoms N b. 1248 fathoms N c. 1048 fathoms Y d. 824 fathoms 1890: A vessel heading SSE is on a course of __________.
N a. 112.5° N b. 135.0° Y c. 157.5° N d. 180.0° 1950: The error in a sextant altitude caused by refraction is greatest when the celestial body is __________.
N a. high in the sky Y b. near the horizon N c. rising N d. at or near transit 2129: 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 B if the lock walls and piers are not awash?
N a. No lights Y b. Three red lights N c. Two red lights N d. One red light 2254: A rock and sand structure extending from the bank of the river toward the channel is known as a __________.
Y a. wingdam N b. towhead N c. cutoff N d. landwall 2328: Universal time (UTI) is another name for __________.
N a. sidereal time Y b. Greenwich mean time N c. ephemeris time N d. atomic time 2329: In low latitudes, a last quarter moon will always rise at about __________.
N a. sunrise N b. 1200 LMT N c. sunset Y d. 2400 LMT 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 2419: A backlash below a lock is defined as a __________.
N a. current setting your vessel on the wall N b. current setting into the lock chamber Y c. an eddy working along the lower guide wall N d. current setting counterclockwise 2509: All persons or vessels within the lock area, including the lock approach channels, come under the authority of the __________.
N a. dockmaster N b. dock captain Y c. lockmaster N d. lock foreman 2512: In the time diagram shown __________. (D005NG )
Y a. you are in east longitude N b. your time is about 1000 N c. your date is a day earlier than the date at Greenwich N d. you must be in the Northern Hemisphere for it to be accurate 2525: Daylight savings time is a form of zone time that adopts the time __________.
N a. two zones to the west N b. two zones to the east N c. one zone to the west Y d. one zone to the east 2584: You must construct a Mercator plotting sheet on a piece of paper measuring 30" by 36". The area includes latitude 30°45'S to 37°15'S and longitude 004°00'E to 005°00'W. Allow a one inch neat line on all sides. What is the maximum distance between each degree of longitude that will permit the area of the plotting sheet to be drawn within the stated limitation?
N a. 3.09 inches N b. 3.22 inches N c. 3.41 inches Y d. 3.58 inches 2687: The letter B in illustration D006NG represents the __________.
N a. celestial horizon N b. visible horizon N c. sensible horizon Y d. geoidal horizon 2694: What is the equivalent of 10°48' in time units?
N a. 2 min. 39 sec. N b. 20 min. 12 sec. Y c. 43 min. 12 sec. N d. 50 min. 12 sec. 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) 2766: In low latitudes, the high(s) of the diurnal variation of pressure occur(s) at __________.
N a. noon N b. noon and midnight Y c. 1000 and 2200 N d. 1600 2776: For a well made and well maintained sextant, the maximum value of which correction is usually so small that it can be ignored?
N a. Personal correction Y b. Instrument correction N c. Phase N d. Dip correction 2800: Where is the pivot point of a towboat with a tow ahead?
N a. One-third the length of the combined unit forward of the towboat Y b. One-third the length of the combined unit back from the head N c. At the head of the towboat N d. One-half the length of the combined unit 2850: What is used to help prevent damage to barges, locks, and landings when you are locking or landing a tow?
N a. Dock cushions N b. Springers N c. Landing bars Y d. Bumpers (fenders) 2974: What daymark shape is used in the lateral system?
N a. Semicircle Y b. Triangle N c. Pentagon N d. Diamond 2986: Some places maintain a zone time of -13. What are the time and date at Greenwich if the zone time and date are 2152, 10 January?
N a. 1052, 9 January Y b. 0852, 10 January N c. 1052, 10 January N d. 1052, 11 January 3067: Which of the following are data layer categories to be displayed on ECDIS?
N a. ECDIS warnings and messages N b. Hydrographic Office data N c. Notice to Mariners information Y d. All of the above 3070: The database information that should be shown when a chart is first displayed on ECDIS is the __________.
N a. display base information Y b. standard display information N c. system electronic nautical chart N d. chart display information