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.
90: When the moon is new or full, which type of tides occur?
N a. Neap Y b. Spring N c. Diurnal N d. Apogean 104: What should you apply to a fathometer reading to determine the depth of water?
N a. Subtract the draft of the vessel. Y b. Add the draft of the vessel. N c. Subtract the sea water correction . N d. Add the sea water correction. 187: Which statement is TRUE concerning apogean tides?
N a. They occur only at quadrature. N b. They occur when the Moon is nearest the Earth. N c. They cause diurnal tides to become mixed. Y d. They have a decreased range from normal. 195: The equation of time is 8m 00s. The mean Sun is ahead of the apparent Sun. If you are 2°W of the central meridian of your time zone, when will the apparent Sun cross your meridian?
Y a. 1216 N b. 1208 N c. 1200 N d. 1152 280: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
N a. the port side of the channel Y b. safe water N c. a hazard to navigation N d. the position of underwater cables 282: The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic describes the light?
N a. It is visible 10 miles. N b. Its distinguishing number is "19M". N c. It has a radar reflector. Y d. None of the above 339: The wind at Frying Pan shoals has been north-northeasterly at an average velocity of 30 knots. The predicted set and drift of the rotary current are 355° at 0.8 knot. What current should you expect?
N a. 010° at 1.1 knots N b. 047° at 0.3 knot Y c. 325° at 0.7 knot N d. 279° at 1.0 knot 351: Which buoy may be odd numbered?
N a. A spherical buoy Y b. An unlighted can buoy N c. A red buoy N d. A yellow buoy 368: A great circle crosses the equator at 134°E. It will also cross the equator at what other longitude?
Y a. 46°W N b. 124°W N c. 134°W N d. 34°E 379: The steady current circling the globe at about 60°S is the __________.
N a. Prevailing Westerly N b. Sub-Polar Flow Y c. West Wind Drift N d. Humboldt Current 398: The velocity of the apparent wind can be less than the true wind and from the same direction, if certain conditions are present. One condition is that the __________.
N a. ship's speed is more than the true wind velocity Y b. true wind is from dead astern N c. true wind is on the beam N d. true wind is from dead ahead 479: You are enroute to assist vessel A. Vessel A is underway at 5 knots on course 063°T, and bears 136°T at 78 miles from you. What is the course to steer at 13 knots to intercept vessel A?
Y a. 114° N b. 158° N c. 295° N d. 340° 553: The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?
N a. 052° N b. 056° Y c. 059° N d. 060° 593: Radar makes the most accurate determination of the __________.
N a. direction of a target Y b. distance to a target N c. size of a target N d. shape of a target 601: White and orange buoys, if lighted, show which color light?
Y a. White N b. Orange N c. Red N d. Alternating yellow and white 612: Which statement is TRUE concerning a Mercator projection?
N a. Degrees of longitude decrease in length as latitude increases. Y b. The length of the meridians is increased to provide for equal expansion in all directions. N c. The mileage between the meridians is increased as the latitude increases. N d. All of the above 681: You sight a spar buoy with the top mark shown in the illustration. You must __________. (D027NG )
N a. pass to the east of the buoy N b. pass to the south of the buoy N c. pass to the north of the buoy Y d. keep well clear of the buoy and pass on either side 708: Which statement about Radio Navigational Warning Broadcasts is TRUE?
N a. Radio navigational warnings are valid for 10 days, unless cancelled earlier. N b. NAVAREA warnings cover coastal areas only, while HYDROLANTS or HYDROPACS cover entire ocean areas. Y c. Radio navigational warnings issued by NGA (NIMA) are published in the Daily Memorandum and the Notice to Mariners. N d. HYDROLANTS and HYDROPACS cover the same geographical areas as NAVAREA warnings, but are for the use of military vessels only. 745: Retrograde motion is the __________.
N a. movement of the points of intersection of the planes of the ecliptic and the equator Y b. apparent westerly motion of a planet with respect to stars N c. movement of a superior planet in its orbit about the Sun N d. movement of the celestial north pole in an elliptical pattern in space 750: On a working copy of a weather map, a cold front is represented by what color line?
N a. Red Y b. Blue N c. Alternating red and blue N d. Purple 763: Time signals broadcast by WWV and WWVH are transmitted __________.
N a. every 15 minutes N b. every 30 minutes N c. every hour Y d. continuously throughout day 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 859: At 1800 ZT on 31 October, your position is LAT 24°50'N, LONG 92°37'W. You are preparing a weather report form, WS Form B-80. How should you encode the first three groups after the call sign if you estimate the wind? (D041NG )
N a. 31123, 99929, 70249 N b. 31183, 99249, 79237 N c. 31243, 99249, 70926 Y d. 01003, 99248, 70926 1026: An air mass that has moved down from Canada would most likely have the symbols __________.
N a. mPk Y b. cPk N c. cTk N d. cTw 1104: Which condition(s) is(are) necessary for the formation of dew?
N a. Clear skies N b. Calm air N c. Earth's surface cooler than the dew point of the air Y d. All of the above 1109: You are on course 146°T. To check the speed of your vessel you should observe a celestial body on which bearing?
N a. 000° N b. 056° N c. 090° Y d. 146° 1153: Heeling error is defined as the change of deviation for a heel of __________.
N a. 2°While the vessel is on an intercardinal heading Y b. 1°While the vessel is on a compass heading of 000° N c. 2° and is constant on all headings N d. 1° while the vessel is on a compass heading of 180° 1160: What will be the velocity of the tidal current at 0.2 mile SSW of Clason Point, NY, at 1125 on 17 April 1983?
N a. 0.5 knot N b. 0.8 knot Y c. 1.1 knots N d. 1.9 knots 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 1173: When adjusting a magnetic compass for error, a deviation table should be made __________.
N a. before correcting for any deviation N b. after correcting for variation Y c. after adjusting the fore-and-aft and athwartships permanent magnets N d. before the quadrantal correctors are placed on the compass 1219: Which sextant in illustration D043NG reads 29°42.5'? (D043NG )
N a. A N b. B N c. C Y d. D 1300: You are approaching a sea buoy which emits a racon signal. This signal is triggered by which type of radar?
Y a. 3 cm N b. 10 cm N c. Both 3 cm and 10 cm N d. Signal does not depend on radar type. 1317: What will be the velocity and direction of the tidal current at Mobile River Entrance, AL, at 0915 CDT (ZD +5) on 13 May 1983?
N a. 0.1 knot at 333°T Y b. 0.3 knot at 333°T N c. 0.7 knot at 151°T N d. 1.8 knots at 025°T 1328: What will be the velocity of the tidal current in Bolivar Roads, Texas, at a point 0.5 mile north of Ft. Point, on 23 November 1983 at 0330 CST (ZD +6)?
Y a. Slack water N b. 0.8 kt N c. 1.2 kts N d. 3.4 kts 1373: The reaction of a gyrocompass to an applied force is known as __________.
Y a. precession N b. earth rate N c. gyroscopic inertia N d. gravity effect 1421: What is the approximate geographic visibility of an object with a height above the water of 70 feet, for an observer with a height of eye of 65 feet?
N a. 16.8 nm Y b. 19.0 nm N c. 20.6 nm N d. 22.4 nm 1466: Advection fog is most commonly caused by __________.
N a. air being warmed above the dew point N b. saturation of cold air by rain N c. a rapid cooling of the air near the surface of the Earth at night Y d. warm moist air being blown over a colder surface 1479: A microbarograph is a precision instrument that provides a __________.
N a. charted record of atmospheric temperature over time Y b. charted record of atmospheric pressure over time N c. graphic record of combustible gases measured in an atmosphere N d. graphic record of vapor pressure from a flammable/combustible liquid 1518: Which publication requires infrequent corrections?
N a. List of Lights N b. Coast Pilot Y c. Sailing Directions (Planning Guide) N d. Radio Navigational Aids 1565: Determine the approximate geographic visibility of an object, with a height above the water of 85 feet (25.9 meters), for an observer with a height of eye of 60 feet (18.3 meters).
N a. 18.4 nm Y b. 19.9 nm N c. 20.8 nm N d. 21.5 nm 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 1595: The Light List indicates that a light has a nominal range of 8 miles and is 48 feet(14.6 meters) high. If the visibility is 6 miles and your height of eye is 35 feet(10.7 meters), at what approximate distance will you sight the light?
N a. 15.0 nm N b. 12.4 nm N c. 8.0 nm Y d. 5.9 nm 1601: Sextant B in illustration D043NG reads __________. (D043NG )
N a. 30°51.0' Y b. 30°42.5' N c. 30°47.5' N d. 31°00.0' 1691: Which of the following is associated with consistently high barometric pressure?
Y a. The horse latitudes N b. The doldrums N c. The prevailing westerlies N d. The trade winds 1786: You are downbound approaching a lock and see 3 green lights in a vertical line. This indicates __________.
N a. that the lock chamber is open and ready to receive your tow N b. that you should hold up until the signal changes to 2 green lights Y c. the upstream end of the river wall N d. the upstream end of the land wall 1820: Information on the operating times and characteristics of foreign radio beacons can be found in which publication?
Y a. List of Lights N b. Coast Pilot N c. Sailing Directions N d. List of Radio beacons 1944: In the horizon system of coordinates what is the equivalent to the celestial equator of the celestial equator system?
Y a. Horizon N b. Prime vertical circle N c. Prime meridian N d. Principal vertical circle 2021: While on watch, you notice that the air temperature is dropping and is approaching the dew point. Which type of weather should be forecasted?
N a. Hail N b. Heavy rain N c. Sleet Y d. Fog 2076: You should plot your dead reckoning position __________.
Y a. from every fix or running fix N b. from every estimated position N c. every three minutes in pilotage waters N d. only in pilotage waters 2124: You must draw a plotting sheet covering latitudes 45°N to 49°N and longitudes 179°E to 178°W. If the distance between latitude 45°N to 49°N is 20 inches, what is the distance between the meridians of 1° of longitude?
N a. 2.9 inches N b. 3.2 inches Y c. 3.4 inches N d. 3.7 inches 2132: 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 Y c. The vertical distance from the tidal datum to the level of the water at any time N d. The vertical distance from the surface of the water to the ocean floor 2169: To make sure of getting the full advantage of a favorable current, you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?
Y a. 30 minutes before the predicted time N b. One hour after the predicted time N c. At the predicted time N d. 30 minutes before flood, one hour after ebb 2234: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?
N a. Move the quadrantal spheres closer to the compass N b. Raise the heeling magnet if the red end is up N c. Remove some of the Flinders bar Y d. Raise or lower the athwartship magnets 2388: The reference point for determination of GMT is the passage of the mean sun over what line?
N a. First point of Aries N b. Observer's meridian N c. 0° longitude Y d. 180° longitude 2428: If your vessel were proceeding up river (ascending), the port side of the channel would be marked according to the U. S. Aids to Navigation System on the Western Rivers by __________.
Y a. green can buoys N b. red can buoys N c. green nun buoys N d. red nun buoys 2481: The letter D as shown represents the __________. (D006NG )
N a. celestial horizon N b. sensible horizon Y c. geometrical horizon N d. visible horizon 2629: In both regions of the IALA buoyage system, which topmark is used on a special mark? (D022NG )
N a. A N b. B N c. C Y d. D 2848: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 6 seconds after the signal was sounded. What is the distance to the shore?
N a. 1200 yards Y b. 1100 yards N c. 1000 yards N d. 900 yards 2958: Drawbridges equipped with radiotelephones display a __________.
N a. day signal of a yellow diamond marked with the call sign N b. white sign with the number 16 and the call sign on it N c. black and white diamond marked with RT 16 Y d. blue and white sign showing the radio's channels 2988: The buoy indicated by the letter A is a __________. (D044NG )
N a. nun Y b. can N c. spar N d. pillar