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 above 124: An electronic depth finder operates on the principle that __________.
N a. radio signals reflect from a solid surface Y b. sound waves travel at a constant speed through water N c. radar signals travel at a constant speed through water N d. pressure increases with depth 136: 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 15 184: When the index and horizon mirrors of a properly adjusted sextant are at an angle of 45° to each other, the arc reads __________.
N a. 22 1/2° N b. 45° N c. 60° Y d. 90° 186: In the doldrums you will NOT have __________.
N a. high relative humidity N b. frequent showers and thunderstorms Y c. steep pressure gradients N d. frequent calms 277: Your vessel goes aground in soft mud. You would have the best chance of refloating it on the next tide if it grounded at __________.
N a. low water neap Y b. low water spring N c. high water neap N d. high water spring 326: You are steaming west 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 low pressure lies to the __________.
Y a. north N b. south N c. east N d. west 401: You are steaming in a westerly direction along the Gulf Coast. You see ahead of you a lighted buoy showing a red isophase light. Which action should you take?
Y a. Alter course to port and leave the buoy to starboard. N b. Alter course to starboard and leave the buoy to port. N c. Alter course and leave the buoy near by on either side. N d. Alter course and pass the buoy well-off on either side. 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. 439: If a weather bulletin shows the center of a low pressure system to be 100 miles due east of you, what winds can you expect in the Southern Hemisphere?
Y a. South-southwesterly N b. North-northwesterly N c. South-southeasterly N d. North-northeasterly 482: Which statement about a gnomonic chart is correct?
N a. A rhumb line appears as a straight line. N b. Distance is measured at the mid-latitude of the track line. N c. Meridians appear as curved lines converging toward the nearer pole. Y d. Parallels, except the equator, appear as curved lines. 511: A survey (special purpose mark) buoy __________.
N a. must be lighted N b. may have a flashing red light N c. may have a fixed white light Y d. None of the above 515: The small circle of the celestial sphere parallel to the celestial equator, and transcribed by the daily motion of the body, is called the __________.
N a. hour circle of the body Y b. parallel of declination N c. vertical circle of the body N d. parallel of altitude 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 559: A great circle crosses the equator at 162°E. It will also cross the equator at what other longitude?
N a. 62°E N b. 126°W N c. 162°W Y d. 18°W 575: The horizontal plane, perpendicular to the zenith-nadir axis, that intersects with the celestial sphere and is tangent to the earth is called the __________.
N a. celestial horizon N b. sensible horizon N c. visible horizon Y d. geoidal horizon 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 783: Magnetism which is present only when the material is under the influence of an external field is called __________.
N a. permanent magnetism Y b. induced magnetism N c. residual magnetism N d. terrestrial magnetism 804: A relative bearing is always measured from __________.
N a. true north N b. magnetic north N c. the vessel's beam Y d. the vessel's head 923: A magnetic compass card is marked in how many degrees?
N a. 90 N b. 180 Y c. 360 N d. 400 989: The Light List shows that a navigational light has a nominal range of 18 miles and a height above water of 22 feet (6.7 meters). Your height of eye is 16 feet (4.9 meters) and the visibility is 2.0 miles. At which approximate range will you first sight the light?
N a. 2.0 miles N b. 2.7 miles N c. 4.2 miles Y d. 5.8 miles 1036: A frontal thunderstorm is caused by __________.
N a. pronounced local heating N b. wind being pushed up a mountain Y c. a warm air mass rising over a cold air mass N d. an increased lapse rate caused by advection of warm surface air 1039: While taking weather observations, you determine that the wind is coming from the west. In the weather log, you would record the wind direction as __________.
N a. 000° N b. 090° N c. 180° Y d. 270° 1129: The motion of celestial bodies relative to other celestial bodies is known as __________.
Y a. space motion N b. apparent motion N c. diurnal motion N d. actual motion 1162: A line connecting all possible positions of your vessel at any given time is a __________.
N a. longitude line N b. latitude line Y c. line of position N d. fix 1166: A series of brief showers accompanied by strong, shifting winds may occur along or some distance ahead of a(n) __________.
N a. upper front aloft N b. cyclone N c. occluded front Y d. cold front 1175: Solid green arrows on the main body of a pilot chart indicate __________.
N a. prevailing wind directions Y b. prevailing ocean current directions N c. probable surface current flow N d. shortest great circle routes 1186: As a cold front passes an observer, pressure __________.
N a. drops and winds become variable Y b. rises and winds become gusty N c. drops and winds become gusty N d. rises and winds become variable 1247: What is the predicted velocity of the tidal current 2 miles west of Southwest Ledge for 2330 DST (ZD +4) on 7 September 1983?
Y a. 1.3 knots N b. 1.6 knots N c. 1.9 knots N d. 2.2 knots 1253: The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is __________.
Y a. deviation N b. variation N c. compass error N d. dip 1282: Entering from sea, a daymark on the port side of the channel would be indicated on a chart by a __________.
N a. red triangle with the letter R N b. white triangle with the letters RG Y c. green square with the letter G N d. white square with the letters GR 1331: When trying to sight a lighthouse you notice a glare from a town in the background. The range at which the light may be sighted due to this glare is __________.
Y a. considerably reduced N b. increased slightly due to extra lighting N c. unchanged N d. increased if the light is red or green due to contrast with the glare 1455: Inferior conjunction is possible for __________.
Y a. Mercury N b. Saturn N c. Mars N d. Jupiter 1492: You are planning a voyage from San Francisco to Japan. Which publication contains information on the ocean routes?
N a. Coast Pilot Y b. Sailing Directions (Planning Guide) N c. Sailing Directions (Enroute) N d. World Port Index 1505: At 0000 you fix your position and change course to 090°T. At 0030 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?
Y a. The current is easterly. N b. The drift is 0.5 knot. N c. You should alter course to the right to regain the track line. N d. The current is perpendicular to your track 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 1608: When using a buoy as an aid to navigation which of the following should be considered?
N a. If the light is flashing the buoy should be considered to be in the charted location. Y b. The buoy may not be in the charted position. N c. The buoy should be considered to be in the charted position if it has been freshly painted. N d. The buoy should be considered to always be in the charted position. 1625: A sling psychrometer is used to measure __________.
N a. seawater temperature N b. engine temperature Y c. dry bulb and wet bulb temperatures N d. barometric pressure 1644: Which scale is used to estimate wind speed by observing sea conditions __________.
N a. Metric scale N b. Wind scale N c. Coriolis scale Y d. Beaufort scale 1667: Air masses near the earth's surface __________.
N a. move from areas of high pressure to areas of low pressure N b. are deflected by the earth's rotation in both hemispheres N c. are deflected by the "Coriolis effect" Y d. All of the above 1674: The letter D in illustration D006NG represents the __________.
N a. visible horizon Y b. geometrical horizon N c. celestial horizon N d. geoidal horizon 1695: Compared to a low pressure system, generally the air in a high is __________.
N a. warmer, less dense, and less stable Y b. cool, more dense, and drier N c. muggy and cloudy N d. extremely moist with high relative humidity 1712: Tornados are often associated with __________.
N a. winds in the warm sector ahead of a cold front and travel from southwest towards the east or northeast N b. squall lines and very heavy thunderstorm activity N c. winds that may be in excess of 200 knots and destructive funnel clouds Y d. All of the above 1771: Which type of precipitation is a product of the violent convection found in thunderstorms?
N a. Snow N b. Freezing Rain Y c. Hail N d. Sleet 1883: Pressure gradient is a measure of __________.
N a. a high-pressure area Y b. pressure difference over horizontal distance N c. pressure difference over time N d. vertical pressure variation 1887: The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 15 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
N a. 12.0 miles N b. 11.0 miles N c. 10.0 miles Y d. 9.0 miles 1964: The great circle on the celestial sphere that passes through the zenith and the north and south poles is the __________.
N a. hour circle N b. prime vertical Y c. principal vertical N d. ecliptic 2240: If you observe a buoy off station you should __________.
N a. fill out and mail CG Form 2692 to the nearest Coast Guard office N b. appear in person at the nearest Coast Guard office N c. notify Coast Guard Headquarters in Washington, DC Y d. immediately contact the nearest Coast Guard office by radiotelephone 2240: If you observe a buoy off station you should __________.
N a. fill out and mail CG Form 2692 to the nearest Coast Guard office N b. appear in person at the nearest Coast Guard office N c. notify Coast Guard Headquarters in Washington, DC Y d. immediately contact the nearest Coast Guard office by radiotelephone 2294: What celestial body may sometimes be observed in daylight?
N a. New Moon N b. Saturn N c. Sirius Y d. Venus 2299: What condition exists at apogee?
N a. The Earth is closest to the Sun. N b. The Moon is farthest from the Sun. Y c. The Earth is farthest from the Moon. N d. The Moon is between the Earth and the Sun. 2382: What causes geocentric parallax?
N a. The varying distance between the Earth and Moon. Y b. The change in the Moon's position relative to the stars when viewed from the Earth's surface, as compared to the Earth's center. N c. The rapid change in declination of the Moon causes a rotational oscillation of its axis. N d. The nearness of the Moon causes an apparent increase in diameter as its altitude increases. 2434: A vessel is heading magnetic east and its magnetic compass indicates a heading of 093°. What action should be taken to remove this error during compass adjustment?
N a. If the red ends of the magnets are aft you should lower the fore-and-aft tray. Y b. If the red ends of the magnets are forward, and the fore-and-aft tray is at the bottom, you should remove some magnets. N c. If the red ends of the magnets are to port you should raise the athwartships tray. N d. If the red ends of the magnets are to port, and the athwartships tray is at the top, you should reverse the magnets. 2464: Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which topmark shown? (D046NG )
N a. A Y b. B N c. C N d. D 2796: The correction tables in the Nautical Almanac for use with Moon sights do NOT include the effects of __________.
Y a. instrument error N b. augmentation N c. semidiameter N d. parallax 2928: You are in a buoyed channel at night and pass a lighted buoy with an irregular characteristic. You should report this to the __________.
Y a. Coast Guard N b. harbor master N c. Corps of Engineers N d. National Ocean Service 3022: A green-and-red banded daymark, green band uppermost, will have the shape shown at letter __________. (D045NG )
Y a. A N b. B N c. C N d. D 3030: Isogonic lines are lines on a chart indicating __________.
Y a. points of equal variation N b. points of zero variation N c. the magnetic latitude N d. magnetic dip 3075: Chart information details to be used in ECDIS should be the latest edition of information originated by a government-authorized hydrographic office and conform to the standards of (the) __________.
N a. International Maritime Organization Y b. International Hydrographic Organization N c. NASA N d. US Coast Guard 3105: An automatic identification system (AIS) transponder transmits and receives information broadcasts on _____?
N a. 10 cm, S-band radar N b. 3 cm, X-band radar N c. UHF L-band Y d. VHF maritime band