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.
22: Charts showing the coast of Mexico are produced by the United States __________.
Y a. National Geospatial-Intelligence Agency N b. Coast Guard N c. Naval Observatory N d. National Ocean Service 52: The reference datum used in determining the heights of land features on most charts is __________.
N a. mean sea level Y b. mean high water N c. mean low water N d. half-tide level 114: All echo-sounders can measure the __________.
N a. actual depth of water Y b. actual depth of water below keel N c. average depth from waterline to hard bottom N d. average depth of water to soft bottom 148: When possible, a DR plot should always be started from where?
N a. Any position Y b. A known position N c. An assumed position N d. None of the above 150: An alternating light __________.
N a. shows a light with varying lengths of the lighted period Y b. shows a light that changes color N c. marks an alternate lesser-used channel N d. is used as a replacement for another light 228: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a convergence line? (D042NG )
N a. L N b. F N c. M Y d. Q 259: The Illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "Q" represents a __________. (D042NG )
N a. convergence zone N b. squall line Y c. convergence line N d. weather boundary 263: Loran-C uses the multiple pulse system because __________.
N a. less signal energy is necessary for receiver operation Y b. more signal energy is available at the receiver N c. it significantly increases the peak power N d. it increases the signal capacity 279: As a vessel changes course to starboard, the compass card in a magnetic compass __________.
Y a. remains aligned with compass north N b. also turns to starboard N c. first turns to starboard then counterclockwise to port N d. turns counterclockwise to port 300: Which of the symbols shown represents a warm front? (D018NG )
N a. A N b. B Y c. C N d. D 461: Under the U.S. Aids to Navigation System, a yellow buoy may __________.
Y a. mark a fish net area N b. be lighted with a white light N c. show a fixed red light N d. All of the above 498: What is an advantage of the magnetic compass aboard vessels?
N a. Compass error is negligible at or near the earth's magnetic poles. N b. It does not have to be checked as often. Y c. It is reliable due to it's essential simplicity. N d. All points on the compass rose are readily visible. 507: What will be the time after 1000 EST (ZD +5), on 4 March 1983, that the height of the tide at City Island, NY, will be 2.4 feet?
Y a. 1228 N b. 1240 N c. 1244 N d. 1248 663: You are underway at 10 knots. At 1800 you note a radar contact dead ahead at a range of 10 miles. At 1812 the contact is dead ahead at a range of 8 miles. The estimated speed of the contact is __________.
Y a. dead in the water N b. 5 knots N c. 10 knots N d. 15 knots 671: You sight a buoy fitted with a double-sphere topmark. If sighted at night, this buoy would show a __________.
N a. quick-flashing red light N b. quick-flashing green light Y c. flashing white light showing a group of two flashes N d. flashing red light showing a group of three flashes 785: An amplitude of the Sun in high latitudes __________.
N a. is most accurate before sunrise N b. is most accurate after sunset N c. should only be observed when the Sun's lower limb is above the horizon Y d. is most accurate when the Sun's center is observed on the visible horizon 815: When entering from seaward, a buoy displaying a composite group (2+1) flashing red light indicates __________.
Y a. a junction with the preferred channel to the left N b. a sharp turn in the preferred channel to the right N c. the starboard side of the secondary channel N d. a wreck to be left on the vessel's port side 905: The Sun's center is coincident with the principal vertical circle when __________.
Y a. in lower transit N b. the hour circle and prime vertical are coincident N c. the declination is zero degrees and the azimuth is exactly N 135°E N d. the declination is zero degrees and the azimuth is exactly N 135°W 941: While preparing to enter a Brazilian port, you see ahead a red and green horizontally-striped buoy. The upper band is red. What action should you take?
N a. Alter course to leave the buoy to port. Y b. Alter course to leave the buoy to starboard. N c. Pass the buoy close aboard on either side. N d. Pass the buoy well clear on either side. 979: Which kind of conditions would you observe as the eye of a storm passes over your vessel's position?
Y a. Huge waves approaching from all directions, clearing skies, light winds, and an extremely low barometer N b. Flat calm seas, heavy rain, light winds, and an extremely low barometer N c. Flat calm seas, heavy rain, light winds, and high pressure N d. Huge waves approaching from all directions, clearing skies, light winds, and high pressure 1028: At what angle to the isobars do surface winds blow over the open sea?
N a. About 90° N b. About 50° N c. About 25° Y d. About 15° 1029: Which would be the subject of a NAVAREA warning?
N a. A drifting buoy sighted in mid-ocean N b. Extinguishment of Wolf Trap Light located inside Chesapeake Bay N c. All military exercises on the high seas involving four or more vessels Y d. Off-air times of radio beacons when scheduled for routine maintenance 1063: When adjusting a magnetic compass using the fore-and-aft permanent magnets, you should __________.
N a. use the magnets one at a time, putting one in one side and then one on the opposite side, one step higher. N b. use the magnets in pairs, starting at the top, with trays at the highest point of travel Y c. use the magnets in pairs, from the bottom up, with the trays at the lowest point of travel N d. fill all the trays with magnets, then remove them one-by-one until the deviation is removed 1084: As the temperature of an air mass decreases, the __________.
N a. absolute humidity decreases Y b. relative humidity increases N c. specific humidity decreases N d. dew point rises 1113: A single vertical magnet placed underneath the compass in the binnacle is used to compensate for __________.
N a. the horizontal component of the permanent magnetism Y b. deviation caused by the vessel's inclination from the vertical N c. induced magnetism in the horizontal soft iron N d. induced magnetism in the vertical soft iron 1183: The principal purpose of magnetic compass adjustment is to __________.
N a. reduce the variation as much as possible Y b. reduce the deviation as much as possible N c. reduce the magnetic dip as much as possible N d. allow the compass bowl to swing freely on its gimbals 1200: You want to transit Pollock Rip Channel, MA, on 6 April 1983. What is the period of time around the 0955 (ZD +5) slack in which the current does not exceed 0.3 knot?
N a. 0911 to 0955 N b. 0940 to 1010 N c. 0955 to 1044 Y d. 0935 to 1017 1209: You are on course 201°T. To check the speed of your vessel you should observe a celestial body on which bearing?
N a. 090° N b. 111° N c. 180° Y d. 201° 1235: Weather information provided by the National Weather Service (NWS) advisories should be used along with __________.
N a. the Tide Tables and Tidal Current Tables N b. the local Notice to Mariners Y c. weather maps and local knowledge N d. any U.S. Coast Pilot 1245: You can follow the approach of a dangerous cyclonic storm by inspecting __________.
Y a. a newspaper, a weather map, a weather fax, or a weather forecast N b. the National Weather Service Observing Handbook No.1, Marine Surface Observations N c. the Coast Pilot or Sailing Directions N d. the sky overhead 1322: What will be the velocity of the tidal current at Grant's Tomb, 123rd Street, NY, NY, at 1412 EST (ZD +5) on 22 March 1983?
N a. 0.5 knot N b. 0.8 knot Y c. 1.1 knots N d. 1.3 knots 1337: What will be the time of maximum flood current at Sagamore Bridge on the Cape Cod Canal during the morning of 6 December 1983 (ZD +5)?
Y a. 0708 N b. 0712 N c. 0716 N d. 1020 1381: Geographic range is the maximum distance at which a light may be seen under __________.
N a. existing visibility conditions, limited only by the curvature of the Earth Y b. perfect visibility conditions, limited only by the curvature of the Earth N c. existing visibility conditions, limited only by the intensity of the light N d. perfect visibility conditions, limited only by interference from background lighting 1465: The planet Venus can be observed in the morning before sunrise if it is well to the __________.
Y a. west of and higher than the Sun N b. west of and lower than the Sun N c. east of and higher than the Sun N d. east of and lower than the Sun 1480: What is the definition of height of tide?
N a. The vertical difference between the heights of low and high water N b. The vertical difference between a datum plane and the ocean bottom N c. The vertical distance from the surface of the water to the ocean floor Y d. The vertical distance from the tidal datum to the level of the water at any time 1521: To avoid error you should read the scale of an aneroid barometer with your eye placed __________.
N a. to the right of the pointer N b. to the left of the pointer Y c. directly in front of the pointer N d. slightly above the meniscus 1537: Which sextant in illustration D043NG reads 29°47.5'? (D043NG )
N a. A N b. B Y c. C N d. D 1548: The Illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "K" represents a __________. (D042NG )
Y a. hurricane N b. thunderstorm N c. convergence zone N d. convergence line 1583: The angle measured from the observer's meridian, clockwise or counterclockwise up to 180°, to the vertical circle of the body is the __________.
N a. local hour angle Y b. azimuth angle N c. meridian angle N d. observer's longitude 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. 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 1828: When entering from seaward, a buoy displaying a single-flashing red light indicates __________.
N a. a junction with the preferred channel to the left N b. a wreck to be left on the vessel's port side N c. a sharp turn in the channel to the right Y d. the starboard side of the channel 1888: What is the relative bearing of an object broad on the starboard bow?
N a. 030° Y b. 045° N c. 060° N d. 075° 1909: In the horizon system of coordinates what is equivalent to the equator on the Earth?
N a. Prime vertical circle N b. Principal vertical circle N c. Parallels of altitude Y d. Horizon 2078: If a towboat requires a double lockage it shall give which sound signal at a distance of not more than one mile from the lock?
N a. One short blast followed by two long blasts N b. One long blast followed by one short blast N c. Two long blasts followed by one short blast Y d. One long blast followed by two short blasts 2167: 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. One red light N b. Two red lights Y c. Three red lights N d. One amber light 2171: 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. One amber light N b. One red light N c. Two red lights Y d. Three red lights 2215: You are required to enter a lock on your voyage. Information on the lock regulations, signals, and radio communications can be found in __________.
N a. the publication "Key to the Locks" N b. Bowditch N c. Corps of Engineers Information Bulletin Y d. Coast Pilot 2271: What is the definition of height of tide?
N a. The vertical distance from the surface of the water to the ocean floor Y b. The vertical distance from the tidal datum to the level of the water at any time N c. The vertical difference between a datum plane and the ocean bottom N d. The vertical difference between the heights of low and high water 2288: A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?
N a. The motion of the apparent sun is along the ecliptic. Y b. Measurement of time is along the celestial equator. N c. The speed of the Earth's revolution is not constant. N d. There are variations in the Earth's rotational speed. 2574: What is the equivalent of 2°52' in time units?
N a. 9 min. 23 sec. Y b. 11 min. 28 sec. N c. 11 min. 56 sec. N d. 12 min. 18 sec. 2777: A sailing chart could have a scale of __________.
N a. not more than 1:25,000 N b. 1:35,000 N c. 1:100,000 Y d. 1:700,000 2792: You take a bearing of 142° and 259° of two objects. Which bearing of a third object will give the best fix?
N a. 081° N b. 238° Y c. 201° N d. 234° 2821: 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 level 2902: The direction a vessel is pointed at any given time is the __________.
N a. course N b. track Y c. heading N d. course over the ground 2980: What volume of the Coast Guard Light List is used for the Mississippi River system?
N a. I N b. II N c. IV Y d. V 3040: Which instrument is used to predict the approach of a low pressure system?
N a. Anemometer N b. Fathometer Y c. Barometer N d. Thermometer 3041: The letter H in illustration D006NG represents the __________.
N a. refractive horizon N b. geoidal horizon N c. celestial horizon Y d. visible horizon 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 3120: The short text messaging feature of the automatic identification system (AIS) allows for messages of up to___.
N a. 56 characters N b. 64 characters N c. 128 characters Y d. 158 characters