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.
74: When operated over a muddy bottom, a fathometer may indicate __________.
N a. a shallow depth reading N b. a zero depth reading N c. no depth reading Y d. two depth readings 130: The distance between the surface of the water and the tidal datum is the __________.
N a. range of tide Y b. height of tide N c. charted depth N d. actual water depth 142: Which nautical charts are intended for coastwise navigation outside of outlying reefs and shoals?
N a. Approach charts Y b. General charts N c. Sailing charts N d. Coastal charts 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) 189: While steering a course of 150°T, you wish to observe the Sun for a speed check. What would the azimuth have to be?
N a. 060°T N b. 090°T Y c. 150°T N d. 240°T 206: The winds you would expect to encounter in the North Atlantic between latitudes 5° and 30° are known as the __________.
N a. doldrums N b. westerlies Y c. trades N d. easterlies 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 448: Mean high water is the reference datum used to measure __________.
N a. soundings on the east coast of the United States N b. soundings in European waters Y c. heights of topographical features in the United States N d. both heights and soundings worldwide 457: Find the height of the tide at Port Wentworth, GA, on 5 October 1983, at 1840 DST (ZD +4).
N a. 3.0 feet N b. 3.5 feet N c. 4.0 feet Y d. 4.4 feet 496: Severe tropical cyclones (hurricanes, typhoons) occur in all warm-water oceans except the __________.
N a. Indian Ocean N b. North Pacific Ocean N c. South Pacific Ocean Y d. South Atlantic Ocean 508: Which statement about the chartlet is TRUE? (Soundings and heights are in meters) (D010NG )
Y a. There is a dangerous eddy southeast of Beito Island. N b. Maury lightship is visible for 17 miles. N c. The bottom to the south-southeast of the lightship is soft coral. N d. There is a 12-meter deep west of Beito Island and inside the 5-meter line. 512: On a gnomonic chart, a great circle track between Los Angeles and Brisbane will appear as a __________.
N a. loxodromic curve N b. curved line concave to the equator Y c. straight line N d. spiral approaching the poles as a limit 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 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 540: A white buoy with an orange rectangle on it is used to indicate __________.
N a. danger N b. a controlled area N c. an exclusion area Y d. general information 592: To measure distance on a Mercator chart between the parallels of LAT 34°30'N and LAT 31°30'N, which 30 mile scale should be used?
N a. 33°00'N to 33°30'N N b. 32°30'N to 33°00'N Y c. 32°45'N to 33°15'N N d. 32°15'N to 32°45'N 645: The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°, is the __________.
N a. altitude Y b. declination N c. latitude N d. azimuth angle 678: On 25 December 1981 you observe the Sun's lower limb. The sextant altitude (hs) is 4°06.9'. The height of eye is 47 feet and the index error is 1.6' on the arc. The temperature is 19°F. and the barometer reads 1030.8 millibars. What is the observed altitude (Ho)?
N a. 3°57.4' Y b. 4°01.9' N c. 4°02.5' N d. 4°03.4' 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 791: Under the IALA Buoyage Systems, the topmark of a red and white vertically-striped buoy shall be __________.
N a. X-shaped N b. two black spheres Y c. a single red sphere N d. a single red cone 891: Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have __________.
N a. an even number N b. an odd number N c. a pillar shape Y d. horizontal bands 1003: The quadrantal spheres are used to __________.
Y a. remove deviation on the intercardinal headings N b. remove deviation on the cardinal compass headings N c. remove heeling error N d. compensate for induced magnetism in vertical soft iron 1065: You are in the Northern Hemisphere and a tropical wave is located 200 miles due east of your position. Where will the wave be located 12 hours later?
N a. Farther away to the east N b. In the same position Y c. Nearby to the east N d. Farther away to the west 1170: 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. Y b. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. N c. There is a 12-meter deep hole inside the 5-meter curve just west of Beito Island. N d. The position of the lightship is indicated by the center of the star on the symbol's mast. 1281: The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the __________.
N a. set N b. frequency Y c. period N d. function 1290: In addition to the National Weather Service, what agency provides plain-language radio weather advisories for the coastal waters of the United States?
N a. National Geospatial-Intelligence Agency N b. U.S. Hydrological Survey Y c. U.S. Coast Guard N d. American Meteorological Service 1315: What is a lighted safe water mark fitted with to aid in its identification?
N a. Red and white retroreflective material N b. A sequential number Y c. A spherical topmark N d. A red and white octagon 1340: The annual change in variation for an area can be found in __________.
N a. the handbook for Magnetic Compass Adjustment, Pub 226 Y b. the center of the compass rose on a chart of the area N c. the compass deviation table N d. Variation does not change. 1349: The symbols shown are used on radio facsimile weather charts. Which of these symbols indicates a severe squall line? (D042NG )
N a. F N b. I Y c. G N d. H 1397: What will be the velocity of the tidal current at Port Jefferson Harbor Entrance, NY, at 1600 EST (ZD +5) on 23 December 1983?
N a. 0.9 knot Y b. 1.1 knots N c. 1.6 knots N d. 2.0 knots 1461: The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation should you apply?
Y a. 3°27'W N b. 3°27'E N c. 4°03'W N d. 4°03'E 1520: The diurnal inequality of the tides is caused by __________.
Y a. the declination of the Moon N b. changing weather conditions N c. the Moon being at apogee N d. the Moon being at perigee 1584: A decrease in barometric pressure is associated with all of the following except __________.
N a. rising warm air N b. proximity to a low pressure area N c. inward spiraling circulation Y d. clear dry weather 1714: Which statement concerning storm surges on the Great Lakes is FALSE?
Y a. They are common along the deeper areas of the lakes. N b. They cause rapid differences in levels between one end of the lake and the other. N c. The greatest water level difference occurs when the wind is blowing along the longitudinal axis of the lake. N d. If the wind subsides rapidly, a seiche effect will most likely occur. 1742: In the Northern hemisphere which semicircle of a hurricane is the navigable semicircle?
Y a. Left N b. Right N c. Front N d. Back 1778: Illustration D037NG represents a movable dam. If the wickets are down and there are open weirs due to high water, what light(s) will be shown at A if the lock walls and piers are not awash? (D037NG )
Y a. One red light N b. Two red lights N c. Three red lights N d. One green light 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 1872: To find a magnetic compass course from a true course you must apply __________.
N a. deviation N b. variation Y c. deviation and variation N d. magnetic anomalies (local disturbances) 1908: What is the brightest navigational planet?
N a. Saturn N b. Jupiter N c. Mars Y d. Venus 1932: The zenith is the point on the celestial sphere that is __________.
N a. 90° away from the poles Y b. directly over the observer N c. on the eastern horizon N d. over Greenwich 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 2241: The letter C in illustration D006NG represents the __________.
N a. visible horizon N b. geoidal horizon N c. sensible horizon Y d. celestial horizon 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 2259: A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 317°. What action should be taken to remove this error during compass adjustment?
N a. If the quadrantal spheres are out as far as possible replace them with smaller spheres. N b. If the quadrantal spheres are in as far as possible remove one of the spheres. N c. If the quadrantal spheres are in as far as possible replace them with smaller spheres. Y d. If the quadrantal spheres are out as far as possible, move the quadrantal spheres in. 2324: Deneb is found in what constellation?
Y a. Cygnus N b. Pegasus N c. Ursa Major N d. Andromeda 2349: The summer solstice is the point where the Sun is at __________.
Y a. maximum declination north N b. maximum declination south N c. 0° declination going to northerly declinations N d. 0° declination going to southerly declinations 2378: Which light signal indicates that you may approach the lock?
N a. Flashing red Y b. Flashing amber N c. Steady amber N d. Steady green 2410: A facility used for the discharge of a cargo of a particular hazard, such as chlorine, butane or ethane, must have what to warn water traffic of an immediate danger during fire or cargo release?
N a. An emergency boat and crew Y b. A siren or rotating flashing light N c. Flashing red lights located one-half mile upstream and downstream of the facility N d. Buoys with flashing lights controlled from shore, located one-half mile upstream and downstream of the facility 2430: You are on course 222°T and take a relative bearing of a lighthouse of 025°. What is the true bearing to the lighthouse?
N a. 197° Y b. 247° N c. 315° N d. 335° 2499: The "head of the bend" is the __________.
Y a. top or upstream beginning of a bend N b. bottom or downstream beginning of a bend N c. midpoint or center radius of a bend N d. center line or apex of a bend 2538: The light characteristic of composite group flashing (2 + 1) is used in the Aids to Navigation System on the Western Rivers for lights on __________.
N a. the right descending bank N b. the left descending bank Y c. preferred-channel buoys N d. daymarks with no lateral significance 2634: Under the U.S. Aids to Navigation System on the Western Rivers, a preferred-channel buoy is __________.
Y a. horizontally-banded red and green N b. vertically-striped red and white N c. solid red N d. solid green 2672: When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________.
Y a. continue on the present course N b. come left N c. come right N d. wait until the lights are no longer in a vertical line 2818: You take bearings of 313°T and 076°T on two objects. Which bearing of a third object will give the best fix?
N a. 048°T N b. 101°T N c. 142°T Y d. 187°T 2854: The distance in miles between the circle of equal altitude for the observed altitude (Ho) and the circle of equal altitude for the computed altitude (Hc) is the __________.
N a. equation of time N b. zenith distance Y c. intercept N d. zenith angle 2862: When slanted letters are used to spell the name of a charted object you know the __________.
N a. object is only a hazard to vessels drawing in excess of 20 feet N b. position is approximate or doubtful N c. object is always visible Y d. object may cover and uncover with the tide 3061: In a river subject to tidal currents, the best time to dock a ship without the assistance of tugs is __________.
N a. at flood tide N b. at high water N c. when there is a following current Y d. at slack water 3071: The level of database information which cannot be removed from the ECDIS display and consists of information which is required at all times in all geographic areas and under all circumstances is the __________.
Y a. display base information N b. standard display information N c. system electronic nautical chart N d. chart display information 3116: With respect to automatic identification systems (AIS), which information is expected to be broadcast every 1 to 10 seconds?
N a. Name of ship Y b. Ship's heading N c. IMO number N d. Vessel's draft