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 37: What does the term "tide" refer to?
N a. Horizontal movement of the water Y b. Vertical movement of the water N c. Mixing tendency of the water N d. Salinity content of the water 154: Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?
N a. Salinity of water N b. Temperature of water N c. Atmospheric pressure Y d. Type of bottom 166: On the pole side of the high pressure belt in each hemisphere, the pressure diminishes. The winds along these gradients are diverted by the Earth's rotation toward the east and are known as the __________.
N a. geostrophic winds N b. doldrums N c. horse latitudes Y d. prevailing westerlies 223: In the Loran-C configuration shown, the stations located at X, Y, and Z are called __________. (D003NG )
N a. repeater stations Y b. secondary stations N c. composite stations N d. alternate stations 256: The belt of light and variable winds between the westerly wind belt and the northeast trade winds is called the __________.
Y a. subtropical high pressure belt N b. intertropical convergence zone N c. doldrum belt N d. polar frontal zone 278: You are underway on course 050°T and your maximum speed is 11 knots. The eye of a hurricane bears 070°T, 80 miles from your position. The hurricane is moving towards 270°T at 19 knots. If you maneuver at 11 knots to avoid the hurricane, what could be the maximum CPA?
N a. 84 miles N b. 79 miles N c. 74 miles Y d. 66 miles 281: A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________.
N a. white light Y b. red light N c. green light N d. light characteristic of Morse (A) 321: Which buoy may be even numbered?
N a. Mid-channel buoy Y b. Unlighted nun buoy N c. Lighted green buoy N d. All of the above 369: You are underway on course 050°T and your maximum speed is 11 knots. The eye of a hurricane bears 070°T, 80 miles from your position. The hurricane is moving towards 270°T at 19 knots. What course should you steer at 11 knots to have the maximum CPA?
N a. 250° N b. 234° N c. 227° Y d. 215 ° 417: On 6 July 1983, at 1830 DST (ZD +4), what will be the predicted height of tide at Newburgh, NY?
N a. 3.3 feet N b. 2.6 feet N c. 2.4 feet Y d. 2.0 feet 422: If you are sailing from the East Coast of the United States to the Caribbean Sea, which publication would contain information on weather, currents, and storms?
N a. Sailing Charts of the Caribbean Sea Y b. Pilot Charts of the North Atlantic N c. Light Lists, Atlantic and Gulf Coast N d. Tidal Current Tables 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 717: Which term refers to the direction a current is flowing?
Y a. Set N b. Drift N c. Vector direction N d. Stand 755: The sidereal day begins when the __________.
N a. Sun is over the lower branch of the reference meridian N b. Sun is over the upper branch of the reference meridian N c. first point of Aries is over the lower branch of the reference meridian Y d. first point of Aries is over the upper branch of the reference meridian 761: Under the IALA Buoyage Systems, a safe water mark may NOT __________.
N a. be spherical N b. display a white light N c. be lettered Y d. show a quick flashing light 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 818: Ocean swells originating from a typhoon can move ahead of it at speeds near __________.
N a. 10 knots N b. 20 knots N c. 30 knots Y d. 50 knots 862: The U.S. Coast Guard publishes __________.
Y a. Light Lists N b. U.S. Coast Pilots N c. Radio Navigational Aids N d. All of the above 961: In which country would you expect the channels to be marked with the IALA-B Buoyage System?
Y a. Brazil N b. Tanzania N c. New Zealand N d. Norway 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 1007: When a current flows in the opposite direction to the waves, the wave __________.
N a. length is increased Y b. height is increased N c. velocity increases N d. length is unchanged 1037: Generally speaking, a ship steaming across the North Pacific from Japan to Seattle is likely to experience __________.
N a. adverse currents for practically the entire crossing Y b. favorable currents for practically the entire crossing N c. favorable currents in the summer months and adverse currents in the winter months N d. variable currents having no significant effect on the total steaming time 1049: At 0000 you fix your position and change course to 270°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE?
N a. The set is 090°, drift 0.5 knot. Y b. The set is 090°, drift 1.0 knot. N c. The set is 270°, drift 0.5 knot. N d. The set is 270°, drift 1.0 knot. 1122: A barometer showing falling pressure indicates the approach of a __________.
N a. high pressure system Y b. low pressure system N c. high dew point N d. low dew point 1171: A light that has a light period shorter than its dark period is described as __________.
Y a. flashing N b. pulsating N c. occulting N d. alternating 1229: The initial great circle course angle between LAT 23°00'S, LONG 42°00'W and LAT 34°00'S, LONG 18°00'E is 063.8°. What is the true course?
N a. 063.8°T Y b. 116.2°T N c. 243.8°T N d. 296.2°T 1336: On the approach of a warm front, barometric pressure usually __________.
Y a. falls N b. is steady N c. is uncertain N d. rises 1436: Fog forms when the air __________.
N a. is 50% water saturated N b. is 90% water saturated N c. temperature is greater than the dew point temperature Y d. temperature is equal to, or below the dew point temperature 1454: Atmospheric pressure may be measured with a(n) __________.
N a. barograph N b. aneroid barometer N c. mercurial barometer Y d. All of the above 1463: If the gyrocompass error is east, what describes the error and the correction to be made to gyrocompass headings to obtain true headings?
Y a. The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true N b. The readings are too low and the amount of the error must be subtracted from the compass to obtain true N c. The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true N d. The readings are too high and the amount of the error must be subtracted from the compass to obtain true 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. 1536: What will NOT induce errors into a Doppler sonar log?
Y a. Increased draft N b. Pitch N c. Roll N d. Change in trim 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 1729: The first cloud formations you can use to indicate the bearing of the center of a hurricane or tropical storm are __________.
Y a. the point of convergence of the cirrus clouds N b. the direction of movement of thunderstorms on radar N c. the darkest point of the clouds in the "bar" of the storm N d. the point of origin of the altostratus clouds 1753: On a weather map, a large letter "H" means __________.
Y a. a high pressure area with cool, dry air, and fair weather N b. a high pressure area with warm, moist air, and inclement weather N c. horse latitudes, with rough seas and strong winds N d. a heavy squall line near the "H" 1799: The letter D in illustration D006NG represents the __________.
N a. celestial horizon N b. visible horizon Y c. geometrical horizon N d. geoidal horizon 1841: The letter A as shown represents the __________. (D006NG )
Y a. sensible horizon N b. geoidal horizon N c. visible horizon N d. celestial horizon 1842: What is the major problem with taking high altitude observations?
N a. Possible errors due to unusual refraction may exist. N b. The tables are not as accurate due to inherent errors in the spherical triangle at high altitudes. N c. Rapidly changing altitudes make it difficult to get an accurate altitude. Y d. It is difficult to establish the point where the sextant is vertical to the horizon. 1852: When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________.
Y a. 90° - Ho N b. 180° - GHA N c. GHA - LHA N d. z - d 1874: Lighted white and orange buoys must show which color light?
N a. Orange N b. Red N c. Alternating yellow and white Y d. White 1962: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
Y a. the port side of the channel N b. a sharp turn in the channel to the right N c. a junction with the preferred channel to the left N d. a wreck to be left on the vessel's starboard side 2008: What term is used to describe a tank barge constructed with the structural framing outside the cargo tank and the cargo tank plating separated from the shell plating?
N a. Shell plated Y b. Double hull N c. Hopper type N d. Independent tank 2073: Chart legends printed in capital letters show that the associated landmark is __________.
N a. a radio transmitter N b. a government facility or station N c. inconspicuous Y d. conspicuous 2074: When approaching a lock and at a distance of not more than a mile, vessels desiring a single lockage shall sound which signal?
Y a. One long blast followed by one short blast N b. One short blast followed by one long blast N c. Two short blasts N d. Two long blasts 2085: Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained from the __________.
Y a. Broadcast Notice to Mariners N b. Light List Vol. V N c. U.S. Coast Pilot N d. Sailing Directions 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 2215: You are required to enter a lock on your voyage. Information on the lock regulations, signals, and radio communications can be found in __________.
N a. the publication "Key to the Locks" N b. Bowditch N c. Corps of Engineers Information Bulletin Y d. Coast Pilot 2264: The revision date of a chart is printed on which area of the chart?
N a. Top center Y b. Lower-left corner N c. Part of the chart title N d. Any clear area around the neat line 2272: Mars will not be visible __________.
N a. at elongation angles near 180° N b. from quadrature to opposition Y c. at conjunction N d. at opposition 2334: Other than the Sun and Moon, the brightest object in the sky is __________.
N a. Sirius N b. Canopus Y c. Venus N d. Jupiter 2348: Under the IALA cardinal system, a mark with a quick light showing 9 flashes every 15 seconds indicates that the safest water is on the __________.
N a. north side of the mark Y b. west side of the mark N c. east side of the mark N d. south side of the mark 2534: You must construct a Mercator plotting sheet on a piece of paper measuring 26" by 30". The area includes latitude 28°15'N to 35°45'N and longitude 174°00'E to 178°00'W. Allow a three-quarter 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 limitation?
N a. 2.76 inches N b. 2.92 inches Y c. 3.06 inches N d. 3.19 inches 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 2669: Under the IALA Buoyage System, which topmark shown will be displayed on a safe water mark? (D023NG )
Y a. A N b. B N c. C N d. D 2828: The daily recurring pattern of pressure changes most noticeable in low latitudes is the __________.
N a. daily lapse reading Y b. diurnal variation of pressure N c. pressure tendency N d. synoptic pressure 2936: Information on search and rescue procedures and special, local communications used in Mexican waters will be found in the __________.
N a. World Port Index N b. International Code of Signals (Pub 102) Y c. Sailing Directions (Planning Guides) N d. International Aeronautical and Maritime Search and Rescue Manual 2990: In which source could you find the vertical clearance of a bridge on the Ohio River?
N a. Notice to Mariners Y b. Light List of the Mississippi River System N c. Great Lakes Pilot N d. Coast Pilot of the Gulf of Mexico 2991: When using a radar in an unstabilized mode, fixes are determined most easily from __________.
N a. objects that are close aboard Y b. ranges N c. tangent bearings N d. center bearings 3041: The letter H in illustration D006NG represents the __________.
N a. refractive horizon N b. geoidal horizon N c. celestial horizon Y d. visible horizon