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.
6: Wind velocity varies __________.
N a. directly with the temperature of the air mass Y b. directly with the pressure gradient N c. inversely with the barometric pressure N d. inversely with the absolute humidity 88: Which position includes the effects of wind and current?
N a. Dead reckoning position N b. Leeway position Y c. Estimated position N d. Set position 121: A safe water mark may be __________.
N a. vertically striped N b. spherical N c. showing a white light Y d. All 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 177: How many high waters usually occur each day on the East Coast of the United States?
N a. One Y b. Two N c. Three N d. Four 178: You are steering a southerly course, and you note that the chart predicts an easterly current. Without considering wind, how may you allow for the set?
Y a. Head your vessel slightly to the right N b. Head your vessel slightly to the left N c. Decrease your speed N d. Increase your speed 202: On charts of U.S. waters, a magenta marking is NOT used for marking a __________.
N a. radio beacon N b. lighted buoy N c. prohibited area Y d. 5-fathom curve 268: The illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "L" represents a __________. (D042NG )
N a. convergence line N b. maritime air mass N c. warm front Y d. convergence zone 295: The difference (measured in degrees) between the GHA of the body and the longitude of the observer is the __________.
N a. right ascension Y b. meridian angle N c. SHA of the observer N d. zenith distance 487: What will be the time after 0600 (ZD +3), on 6 March 1983, that the height of the tide at Puerto Rosales, Argentina, will be 9.0 feet (2.7 meters)?
N a. 0740 N b. 0754 N c. 0840 Y d. 0922 516: A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the following EXCEPT __________.
N a. higher than normal swells N b. high winds N c. winds veering from south, through west, to northwest Y d. gradual pressure gradient 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 623: An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer's vessel. Which of the following is NOT a characteristic of indirect echoes?
N a. Their bearing is almost constant, even when the true bearing of the contact changes appreciably. Y b. They always appear on a bearing of 90°From the true bearing of the contact. N c. The indirect echoes usually appear in shadow sectors. N d. When plotted, their movements are usually abnormal. 679: A tropical wave is usually preceded by __________.
N a. tropical storms Y b. good weather N c. heavy rain and cloudiness N d. heavy seas 696: The diurnal pressure variation is most noticeable in the __________.
N a. polar regions N b. horse latitudes N c. roaring forties Y d. doldrums 729: The doldrums are characterized by __________.
N a. steady, light to moderate winds Y b. frequent calms N c. clear skies N d. low humidity 751: Under the IALA Buoyage Systems, a yellow buoy may mark __________.
N a. fish net areas N b. spoil areas N c. military exercise zones Y d. All of the above 775: A sidereal day is shorter than a solar day. This difference is due to __________.
N a. irregularities in the daily rotational rate of the Sun N b. the space motion of the solar system N c. the precession of the equinoxes Y d. the use of different reference points 798: A HYDROLANT warning would normally be sent for all of the following EXCEPT __________.
Y a. extinguishment of Robbins Reef Light in New York City's Upper Bay N b. unexploded ordinance in ocean waters at a depth of 78 fathoms (143 meters) N c. the presence of a large unwieldy tow in congested offshore water N d. a report of an overdue ship 832: What is the most important source of information to be used in correcting charts and keeping them up to date?
N a. Fleet Guides Y b. Notice to Mariners N c. Sailing Directions N d. Pilot Charts 833: The magnetic compass magnets are acted on by the horizontal component of the Earth's total magnetic force. This magnetic force is GREATEST at the __________.
N a. north magnetic pole N b. south magnetic pole N c. magnetic prime vertical meridian Y d. magnetic equator 864: Uniform, grayish-white cloud sheets that cover large portions of the sky, and are responsible for a large percentage of the precipitation in the temperate latitudes, are called __________.
Y a. altostratus N b. altocumulus N c. cirrostratus N d. cirrocumulus 882: Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?
N a. Geographical positions outlining the area of the sector Y b. True bearings as observed from the ship toward the light N c. An outline of the area of the sector N d. True bearings as observed from the light toward the ship 932: To find the specific phase characteristic of a lighthouse on a sound of the United States you would use the __________.
N a. American Practical Navigator Y b. Light List N c. Nautical Chart Catalog N d. U.S. Coast Pilot 949: In Region A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a __________.
N a. black can buoy Y b. red can buoy N c. black conical buoy N d. red conical buoy 969: The population of northern right whales, an endangered species, numbers approximately __________.
Y a. 300 N b. 5000 N c. 100,000 N d. 1,000,000 994: Which list of clouds is in sequence, from highest to lowest in the sky?
N a. Altostratus, cirrostratus, stratus Y b. Cirrostratus, altostratus, stratus N c. Stratus, cirrostratus, altostratus N d. Altostratus, stratus, cirrostratus 1047: Which is NOT a contributing cause of ocean currents?
N a. Surface winds N b. Density differences in the water N c. Underwater topography Y d. Gravitational effects of celestial bodies 1059: The Light List shows that a navigational light has a nominal range of 17 miles and a height above water of 28 feet (8.5 meters). Your height of eye is 32 feet (9.8 meters) and the visibility is 11.0 miles. At what approximate range will you first sight the light?
N a. 11.0 miles Y b. 12.6 miles N c. 15.7 miles N d. 18.0 miles 1158: What type of cloud is indicated by the number 5 in illustration D039NG? (D039NG )
N a. Cirrostratus N b. Cirrocumulus Y c. Altocumulus N d. Nimbostratus 1219: Which sextant in illustration D043NG reads 29°42.5'? (D043NG )
N a. A N b. B N c. C Y d. D 1239: While taking weather observations, you determine that the wind is blowing from the northeast. You would record the wind direction in the weather log as __________.
Y a. 045° N b. 090° N c. 135° N d. 225° 1246: What weather change accompanies the passage of a cold front in the Northern Hemisphere?
N a. Wind shift from northeast clockwise to southwest N b. Steady dropping of barometric pressure N c. Steady precipitation, gradually increasing in intensity Y d. A line of cumulonimbus clouds 1271: Which word indicates color variation in the characteristics of a light?
N a. Opposing N b. Changing N c. Reversing Y d. Alternating 1307: What will be the velocity of the tidal current southwest of Hunts Point, NY, at 0932 EST (ZD +5) on 16 March 1983?
N a. 0.9 knot Y b. 1.5 knots N c. 1.8 knots N d. 2.3 knots 1308: On a voyage from Cape Town to London, the favorable ocean current off the coast of Africa is the __________.
N a. Canary Current Y b. Benguela Current N c. Agulhas Current N d. South Atlantic Current 1319: The Sailing Directions (Planning Guide) contain information on all of the following EXCEPT __________.
Y a. coastal features N b. ocean basin environment N c. ocean routes N d. military operating areas 1415: Planetary aberration is due, in part, to __________.
N a. refraction of light as it enters the Earth's atmosphere N b. rotation of the Earth on it's axis Y c. the body's orbital motion during the time required for its light to reach Earth N d. a false horizon 1420: the position labeled "E" was plotted because __________. (D051NG )
N a. the vessel's position was fixed at 1145 N b. a dead reckoning position is plotted within a half-hour of each course change N c. the position is a running fix Y d. a dead reckoning position is plotted for each speed change 1613: Where would you find information concerning the duration of slack water?
N a. Tide Tables Y b. Tidal Current Tables N c. American Practical Navigator N d. Sailing Directions 1626: Which instrument is used to measure the relative humidity of the air?
N a. A hydrometer Y b. A hygrometer N c. A spectrometer N d. A barograph 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 1807: Which weather system produces strong cold winds called "Northers" during the winter months in the Gulf of Mexico?
N a. A polar maritime air mass Y b. A high pressure system N c. A cyclone N d. A low pressure system 1809: What occurs when rising air cools to the dew point?
N a. Advection fog forms N b. Humidity decreases N c. Winds increase Y d. Clouds form 1879: A chart projection depicting the poles and a small area on either side of a connecting meridian, that is sometimes used for star charts, is the __________.
N a. azimuthal gnomonic projection N b. Lambert conformal projection Y c. transverse Mercator projection N d. polyconic projection 1880: A vessel heading SSW is on a course of __________.
Y a. 202.5° N b. 225.0° N c. 247.5° N d. 270.0° 1948: "Space motion" is the __________.
N a. action causing precession of the equinoxes Y b. motion of a body in the solar system relative to the stars N c. motion of a celestial body in its orbit N d. irregularity in the motion of the Earth caused by other celestial bodies 2040: A vessel heading NNE is on a course of __________.
Y a. 022.5° N b. 045.0° N c. 067.5° N d. 090.0° 2183: 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 D if the lock walls and piers are not awash?
N a. Three red lights N b. Two red lights Y c. One red light N d. No light 2251: Which statement concerning the chartlet shown is TRUE? (Soundings and heights are in meters) (D010NG )
N a. Maury lightship is visible for 17 miles. N b. The bottom to the south-southeast of the lightship is soft coral. Y c. There is a dangerous eddy southeast of Beito Island. N d. There is a 12-meter deep west of Beito Island and inside the 5-meter line. 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. 2459: The controlling depth of the river is __________.
N a. the minimum depth of the river prescribed in the channel maintenance program N b. the edge of a dredged channel N c. the highest level to which the river may rise without flooding Y d. the least available water in a channel which limits the draft of boats and tows 2498: The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers for lights on __________.
Y a. the right descending bank N b. the left descending bank N c. preferred channel buoys N d. daymarks with no lateral significance 2567: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
N a. a sharp turn in the channel to the right N b. a wreck to be left on the vessel's starboard side N c. a junction with the preferred channel to the left Y d. the port side of the channel 2666: The following boats are approaching a lock. Which has priority for locking?
N a. An 85-foot yacht Y b. Corps of Engineer towboat running empty-headed N c. "Delta Queen" (passenger vessel) N d. An integrated chemical tow 2722: The paths of intended travel between three or more points is the __________.
N a. course Y b. track N c. bearing N d. course over the ground 2831: A coastal chart could have a scale of __________.
N a. not more than 1:25,000 N b. 1:35,000 Y c. 1:100,000 N d. 1:500,000 2938: You take a bearing of 176° of a lighthouse. What bearing of another object would give the best fix?
N a. 000° N b. 021° N c. 189° Y d. 272° 3078: Which data must ECDIS be able to record at one-minute intervals?
N a. Position N b. Electronic navigational chart source N c. Course made good history Y d. All of the above 3102: The typical operating range of automatic identification systems (AIS) at sea is nominally __________.
N a. 50-75 nm Y b. 20-25 nm N c. 6-8 nm N d. 3-4 nm