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.
64: Mean lower low water is the reference plane used for __________.
N a. all vertical measurements N b. heights above water for lights, mountains, etc. Y c. soundings on the U.S. east and west coasts N d. water depths on the U.S. east coast only 159: The apparent wind can be zero when the true wind is from __________.
N a. ahead and equal to the ship's speed Y b. astern and equal to the ship's speed N c. ahead and equal to twice the ship's speed N d. astern and equal to twice the ship's speed 171: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
Y a. safe water N b. a fish trap area N c. a hazard to navigation N d. a bifurcation in the channel 220: At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?
N a. The current is westerly at 0.5 knot. N b. You must increase speed to compensate for the current. N c. The current cannot be determined. Y d. The drift is 0.25 knot. 220: At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?
N a. The current is westerly at 0.5 knot. N b. You must increase speed to compensate for the current. N c. The current cannot be determined. Y d. The drift is 0.25 knot. 308: The wind at Frying Pan shoals has been west-northwesterly at an average velocity of 40 knots. The predicted set and drift of the rotary current are 323° at 0.6 knot. What current should you expect?
N a. 001° at 0.7 knot Y b. 018° at 0.4 knot N c. 052° at 0.6 knot N d. 089° at 0.9 knot 342: A polyconic projection is based on a __________.
N a. plane tangent at one point N b. cylinder tangent at one parallel N c. cone tangent at one parallel Y d. series of cones tangent at selected parallels 350: When making landfall at night, the light from a powerful lighthouse may sometimes be seen before the lantern breaks the horizon. This light is called the __________.
N a. diffusion N b. backscatter Y c. loom N d. elevation 355: During the month of October the Sun's declination is __________.
N a. north and increasing N b. north and decreasing Y c. south and increasing N d. south and decreasing 357: On 10 August 1983 you will dock near Days Point, Weehawken, on the Hudson River, at 1800 DST (ZD +4). The charted depth alongside the pier is 24 feet (7.3 meters). What will be the depth of water when you dock?
N a. 23.5 feet (7.1 m) Y b. 23.9 feet (7.2 m) N c. 24.9 feet (7.5 m) N d. 26.3 feet (8.0 m) 460: When using horizontal sextant angles of three objects to fix your position, an indeterminate position will result in which situation?
N a. The objects lie in a straight line. N b. The vessel is inside of a triangle formed by the objects. N c. The vessel is outside of a triangle formed by the objects. Y d. A circle will pass through your position and the three objects. 477: Determine the height of the tide at 1430 EST (ZD +5) at New Bedford, MA, on 10 April 1983.
N a. 1.1 feet N b. 1.2 feet Y c. 1.4 feet N d. 1.7 feet 564: A hygrometer is a device used for determining __________.
N a. the absolute temperature N b. atmospheric pressure N c. wind velocity Y d. relative humidity 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 596: Which condition would NOT indicate the approach of a tropical storm?
N a. Long, high swells N b. Cirrus clouds N c. Halos about the Sun or Moon Y d. Decrease in wind velocity 670: A NAVAREA warning carries the following number; 1986/87 (11). Which statement is TRUE?
N a. The warning was issued in 1986, the 87th sequentially numbered warning and broadcast 11 times. Y b. This is warning number 1986 issued in 1987, and it affects sub-region 11. N c. This warning is valid in 1986 and 1987 and is the eleventh two-year warning. N d. The subject of this warning first appeared in 1986; this warning is in 1987 and is the eleventh on this topic. 781: The IALA Buoyage Systems do NOT apply to __________.
N a. the sides and centerlines of navigable channels N b. natural dangers and other obstructions, such as wrecks Y c. lighthouses and lightships N d. areas in which navigation may be subject to regulation 819: Which sextant has an index error of 4'20" off the arc? (D050NG )
Y a. A N b. B N c. C N d. D 860: The Light List shows that a navigational light has a nominal range of 10 miles and a height above water of 38 feet (11.6 meters). Your height of eye is 52 feet (15.8 ,meters) and the visibility is 11.0 miles. At which approximate range will you first sight the light?
Y a. 10.5 miles N b. 13.9 miles N c. 15.6 miles N d. 18.0 miles 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 934: Clouds that form as small white flakes or scaly globular masses covering either small or large portions of the sky are __________.
N a. cirrus N b. cirrostratus N c. altostratus Y d. cirrocumulus 978: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. recurvature effect N b. extension of the low pressure ridge Y c. wind circulation and forward motion of the storm N d. direction of circulation and pressure gradient 1004: A low, uniform layer of cloud resembling fog, but not resting on the ground, is called __________.
N a. cumulus N b. nimbus Y c. stratus N d. cirrus 1151: Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?
N a. A safe-water buoy will display red and white vertical stripes of reflective material. N b. All reflective material is white because it is the most visible at night. N c. A special-purpose mark will display either red or green reflective material to agree with its shape. Y d. A preferred-channel buoy displays either red or green reflective material to agree with the top band of color. 1172: Which position shown would likely have stratus or stratocumulus clouds, occasional light drizzle, steady southerlies around 10 knots, and steady temperatures? (D049NG )
N a. B N b. C N c. D Y d. E 1429: A celestial body will cross the prime vertical circle when the latitude is numerically __________.
Y a. greater than the declination and both are of the same name N b. less than the declination and both are of the same name N c. greater than the declination and both are of contrary name N d. less than the declination and both are of contrary name 1473: Which statement about gyrocompass error is TRUE?
Y a. The amount of the error and the sign will generally be the same on all headings. N b. The sign (E or W) of the error will change with different headings of the ship. N c. Any error will remain constant unless the compass is stopped and restarted. N d. Any error shown by a gyro repeater will be the same as the error of the master compass. 1482: Which statement concerning current is TRUE?
N a. Current can be determined by measuring the direction and distance between simultaneous EP and DR positions. Y b. The drift of the current should be averaged out on a one hour basis. N c. After the current is determined, it should not be used for further plotting because it is an unknown variable. N d. The distance between a simultaneous DR position and fix is equal to the drift of the current. 1482: Which statement concerning current is TRUE?
N a. Current can be determined by measuring the direction and distance between simultaneous EP and DR positions. Y b. The drift of the current should be averaged out on a one hour basis. N c. After the current is determined, it should not be used for further plotting because it is an unknown variable. N d. The distance between a simultaneous DR position and fix is equal to the drift of the current. 1484: You should plot your dead reckoning position at __________.
N a. every fix or running fix N b. every course change N c. every speed change Y d. All of the above are correct. 1503: A radar range to a small, charted object such as a light will provide a line of position in which form?
N a. Straight line Y b. Arc N c. Parabola N d. Hyperbola 1507: When you are steering on a pair of range lights and find the upper light is above the lower light you should __________.
N a. come right N b. come left N c. wait until the lights are no longer in a vertical line Y d. continue on the present course 1576: You are entering an east coast port and see a buoy with a yellow triangle painted on it. This indicates __________.
Y a. you are in the vicinity of the ICW N b. the buoy is a special mark N c. the buoy is off station N d. the buoy designates a sharp turn in the channel 1589: You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.
N a. smoother seas and warmer water Y b. steeper waves, closer together N c. long swells N d. cirrus clouds 1594: The Illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "P" represents __________. (D042NG )
N a. snow N b. hail Y c. freezing rain N d. sleet 1604: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates freezing rain? (D042NG )
N a. M N b. N N c. O Y d. P 1611: What indicates a dual purpose buoy?
N a. Red buoy with a horizontal yellow band N b. Red and white vertically-striped buoy with a vertical yellow stripe N c. Red and white vertically-striped buoy with a red spherical topmark Y d. Green buoy with a yellow square 1798: The climate of the northern Gulf coast __________.
N a. is humid and subtropical throughout the year N b. has an east coast marine type of climate Y c. is a warm marine type of climate N d. varies from warm to subtropical 1848: The buoy symbol printed on your chart is leaning to the northeast. This indicates __________.
N a. you should stay to the north or east of the buoy N b. you should stay to the west or south of the buoy N c. the buoy is a major lighted buoy Y d. nothing special for navigational purposes 1976: The Moon is nearest to the Earth at __________.
Y a. perigee N b. the vernal equinox N c. the new Moon N d. the full Moon 2001: You have changed course and steadied up on a range. Your heading is 285°T, same as the charted range, and it appears as in illustration D048NG. After several minutes the range appears as in illustration D047NG and your heading is still 285°T. This indicates a __________. (D047NG )
N a. south-setting current Y b. north-setting current N c. leeway caused by a NE'ly wind N d. course made good to the left of the DR track 2049: At morning stars, the first stars that should be observed are those with an azimuth in which quadrant?
Y a. Eastern N b. Southern N c. Western N d. Northern 2165: The illustration 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? (D037NG )
Y a. Three red lights N b. Two red lights N c. One red light N d. One amber light 2166: 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 Y b. Three red lights N c. Two red lights N d. One red light 2190: Clouds are classified according to their __________.
N a. size N b. moisture content Y c. altitude and how they were formed N d. location in a front 2326: A double star is a star that __________.
N a. has a declination equal to twice that of the Sun Y b. comprises two stars that appear close together N c. is twice as bright as a single star N d. suddenly becomes much brighter and then fades 2402: 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 356°. You should now adjust the compass until it reads __________.
Y a. 358° N b. 000° N c. 002° N d. 004° 2429: The lock chamber is 600 feet X 110 feet. Your towboat is 150 feet X 35 feet. Which of these tows will require a double lockage?
N a. A set-over single N b. 4 standard barges abreast next to your boat's head and 3 jumbo abreast in the lead N c. 6 jumbo (3 abreast and 2 long) with a standard on each side of your boat Y d. 9 jumbo barges 2542: Which magnetic compass corrector(s) CANNOT be set while the vessel is on a heading of magnetic north or magnetic south?
N a. Athwartships magnets N b. Heeling magnet Y c. Flinders bar N d. All of the above can be set on magnetic north or magnetic south headings. 2638: A vessel crossing a river on the Western Rivers has the right of way over __________.
N a. vessels ascending the river N b. vessels descending the river N c. all vessels ascending and descending the river Y d. None of the above 2662: You must construct a Mercator plotting sheet on a piece of paper measuring 24" by 28". The area includes latitude 37°S to 42°S and longitude 175°E to 179°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 limitations?
N a. 3.33 inches N b. 3.41 inches Y c. 3.67 inches N d. 3.82 inches 2768: Which type of daymark is used to mark the starboard side of the channel when entering from sea?
N a. Red and white octagon N b. Black and white diamond Y c. Red triangle N d. Green square 2916: You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix?
N a. 022° N b. 131° N c. 211° Y d. 249° 2961: Which position includes the effects of wind and current?
N a. Dead reckoning positions Y b. Estimated positions N c. Leeway position N d. Set position 2981: The maritime radio system consisting of a series of coast stations transmitting coastal warnings is called __________.
Y a. NAVTEX N b. HYDROLANT/HYDROPAC N c. NAVAREA N d. SAFESEA 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 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 3079: With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.
N a. an indication within 5 seconds if the specified HDOP has been exceeded N b. a warning of loss of position N c. a differential GPS status indication of the receipt of DGPS signals Y d. All of the above 3109: While underway, a vessel over 100,000 gross tons with an automatic identification systems (AIS) is expected to broadcast all of the following information every 1 to 10 seconds EXCEPT __________.
N a. rate of turn Y b. name of vessel N c. navigational status N d. ship's heading 3117: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?
Y a. Time stamp N b. IMO number N c. Type of vessel N d. Vessel's maximum displacement