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.
126: A katabatic wind blows __________.
N a. up an incline due to surface heating N b. in a circular pattern Y c. down an incline due to cooling of the air N d. horizontally between a high and a low pressure area 145: The standard time meridian for zone description -1 is __________.
N a. 0° N b. 7 1/2°W N c. 7 1/2°E Y d. 15°E 147: Which statement is TRUE concerning equatorial tides?
N a. They occur when the Sun is at minimum declination north or south. N b. They occur when the Moon is at maximum declination north or south. Y c. The difference in height between consecutive high or low tides is at a minimum. N d. They are used as the basis for the vulgar establishment of the port. 169: You want to transit Hell Gate on 23 July 1983. What is the period of time around the AM (ZD +4) slack before ebb when the current will be less than 0.5 knot?
Y a. 0939 to 0957 N b. 0943 to 0953 N c. 0844 to 0852 N d. 0348 to 0356 192: The description "Racon" beside an illustration on a chart would mean a __________.
N a. radar conspicuous beacon N b. circular radio beacon Y c. radar transponder beacon N d. radar calibration beacon 228: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a convergence line? (D042NG )
N a. L N b. F N c. M Y d. Q 326: You are steaming west in the North Atlantic in an extratropical cyclonic storm, and the wind is dead ahead. According to the law of Buys Ballot, the center of low pressure lies to the __________.
Y a. north N b. south N c. east N d. west 345: A navigator fixing a vessel's position by radar __________.
N a. should never use radar bearings N b. should only use radar bearings when the range exceeds the distance to the horizon Y c. can use radar information from one object to fix the position N d. must use information from targets forward of the beam 452: When navigating in high latitudes and using a chart based on a Lambert conformal projection, __________.
Y a. a straight line drawn on the chart approximates a great circle N b. the chart should not be used outside of the standard parallels N c. the course angle is measured at the mid-longitude of the track line N d. distance cannot be measured directly from the chart 465: When applying a dip correction to the sighted sextant angle (hs), you always subtract the dip because you are correcting __________.
N a. hs to the visible horizon Y b. hs to the sensible horizon N c. hs to the celestial horizon N d. Ho to the celestial horizon 494: Aneroid barometers are usually calibrated to indicate atmospheric pressure in __________.
N a. inches of mercury and centimeters N b. feet of mercury and millibars N c. inches of mercury and millimeters Y d. inches of mercury and millibars 498: What is an advantage of the magnetic compass aboard vessels?
N a. Compass error is negligible at or near the earth's magnetic poles. N b. It does not have to be checked as often. Y c. It is reliable due to it's essential simplicity. N d. All points on the compass rose are readily visible. 510: Which aid is NOT marked on a chart with a magenta circle?
Y a. Aero light N b. Radar station N c. Radar transponder beacon N d. Radio beacon 585: What great circle is always needed to form the astronomical triangle?
N a. Celestial Equator N b. Prime Meridian Y c. Celestial Meridian N d. Prime Vertical Circle 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. 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. 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 837: The Brazil Current flows in which general direction?
N a. Northwesterly Y b. Southwesterly N c. Southeasterly N d. Northerly 871: Under the IALA-A Buoyage System, a buoy marking the starboard side of the channel when approaching from seaward must have a(n) __________.
N a. pillar shape Y b. green color N c. square topmark N d. even number 886: The circulation around a low pressure center in the Northern Hemisphere is __________.
Y a. counterclockwise N b. variable N c. clockwise N d. anticyclonic 933: How many degrees are there on a compass card?
Y a. 360° N b. 380° N c. 390° N d. 420° 1092: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. extension of the low pressure ridge Y b. wind circulation and forward motion of the storm N c. recurvature effect N d. direction of circulation and pressure gradient 1101: In the North Sea area, you sight a buoy showing an uninterrupted quick-flashing white light. Which of the four topmarks shown will this buoy be fitted with under the IALA Buoyage system? (D031NG )
N a. A Y b. B N c. C N d. D 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 1106: The legend/symbol which designates an occluded front is represented by a __________.
N a. red line Y b. purple line N c. blue line N d. dashed blue line 1145: The GHA of a star __________.
Y a. increases at a rate of approximately 15° per hour N b. increases at a rate of approximately 4° per hour N c. decreases at a rate of approximately 15° per hour N d. decreases at a rate of approximately 4° per hour 1221: On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector __________.
N a. indicates the limits of the navigable channel Y b. indicates a danger area N c. is used to identify the characteristics of the light N d. serves no significant purpose 1235: Weather information provided by the National Weather Service (NWS) advisories should be used along with __________.
N a. the Tide Tables and Tidal Current Tables N b. the local Notice to Mariners Y c. weather maps and local knowledge N d. any U.S. Coast Pilot 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 1259: General information on enroute weather and climate is found in __________.
Y a. the Sailing Directions and the Coast Pilot N b. a weather fax N c. the Local Notice to Mariners N d. the Light List 1299: What will be the time (ZD +5) of the second high tide at Weymouth Fore River Bridge, MA, on 12 November 1983?
N a. 1639 N b. 1643 N c. 1647 Y d. 1650 1322: What will be the velocity of the tidal current at Grant's Tomb, 123rd Street, NY, NY, at 1412 EST (ZD +5) on 22 March 1983?
N a. 0.5 knot N b. 0.8 knot Y c. 1.1 knots N d. 1.3 knots 1347: What will be the velocity of the tidal current south of Doubling Point, ME, at 1357 EST (ZD +5) on 3 April 1983?
N a. 0.9 knot N b. 1.3 knots Y c. 2.0 knots N d. 2.6 knots 1385: What is the length of the lunar day?
Y a. 24h 50m 00s N b. 24h 00m 00s N c. 23h 56m 04s N d. 23h 03m 56s 1400: Which type of cloud is among the most dependable for giving an indication of an approaching weather system?
N a. Cumulus Y b. Altostratus N c. Cumulostratus N d. Nimbus 1567: Buoys and day beacons exhibiting a yellow triangle or square painted on them are used __________.
N a. in minor harbors where the controlling depth is 10 feet (3 meters) or less N b. on isolated stretches of the ICW to mark undredged areas Y c. where the ICW and other waterways coincide N d. at particularly hazardous turns of the channel 1569: Three or four feet of the total height of a storm surge in a hurricane can be attributed to __________.
N a. an increase in temperature N b. an increase in the wave period N c. the wind velocity Y d. the decrease in atmospheric pressure 1654: Which weather element cannot be measured accurately while on board a moving vessel?
Y a. Visibility N b. Temperature N c. Wind direction N d. Atmospheric pressure 1840: A vessel heading NW is on a course of __________.
N a. 274.5° N b. 292.5° Y c. 315.0° N d. 337.5° 1890: A vessel heading SSE is on a course of __________.
N a. 112.5° N b. 135.0° Y c. 157.5° N d. 180.0° 1899: What is the relative bearing of an object broad on the starboard beam?
N a. 045° N b. 060° N c. 075° Y d. 090° 1920: Because the actual center of some planets may differ from the observed center, the navigator applies a correction known as the __________.
Y a. phase correction N b. refraction correction N c. semidiameter correction N d. augmentation correction 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 1969: The precession of the equinoxes of the Earth is __________.
N a. the gradual increase in the period of rotation caused by the effects of the Moon N b. the irregularity of the Earth's orbit caused by influences of the Sun and Moon N c. caused by the elliptical shape of the Earth's orbit Y d. similar to a top spinning with its axis tilted 2081: You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________.
N a. 30° N b. 45° N c. 60° Y d. 90° 2175: 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, which light(s) will be shown at D if the lock walls and piers are not awash?
N a. One amber light Y b. One red light N c. Two red lights N d. Three red lights 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. 2320: The type of current which will have the greatest effect on the course made good for your vessel is __________.
N a. one flowing in the same direction as your course steered N b. one flowing in the opposite direction as your course steered Y c. one that flows at nearly right angles to your course steered N d. a rotary current in which the direction of current flow constantly changes 2373: The vertical distance from the tidal datum to the level of the water is the __________.
N a. actual water depth N b. range of tide N c. charted depth Y d. height of tide 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 2519: The standard time meridian for zone description -12 is __________.
N a. 165.0°E N b. 172.5°E Y c. 180.0° N d. 172.5°W 2710: In the horizon system of coordinates what is equivalent to the local hour angle of the celestial equator system?
N a. Altitude Y b. Azimuth N c. Zenith distance N d. Colongitude 2725: A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) __________.
N a. estimated position N b. dead-reckoning position N c. running fix Y d. fix 2820: A towboat is pushing barges ahead at a dangerously fast speed when __________.
N a. the towboat vibrates when backing down N b. the roostertail exceeds the height of the main deck N c. a strain is placed on the face wires Y d. water comes over the foredeck of the lead barges 2940: On the Corps of Engineer's Navigation Maps, the channel is __________.
N a. midway between the banks N b. indicated by depths (in feet) Y c. indicated by a broken line N d. not indicated 3000: All aids to navigation listed in the Mississippi River System Light List are shown as miles from a reference point and on the __________.
N a. east or west bank Y b. left or right descending bank N c. port or starboard side of the vessel N d. left or right ascending bank 3005: The agonic line on an isomagnetic chart indicates the __________.
N a. magnetic equator N b. magnetic longitude reference line Y c. points where there is no variation N d. points where there is no annual change in variation 3008: You take a bearing of 086° of a lighthouse. Which bearing of another object would give the best fix?
N a. 291° N b. 261° N c. 242° Y d. 196° 3065: Raster-scan chart data is __________.
N a. the only format recognized by IMO/IHO N b. organized into many separate files N c. composed of files that are smaller than vector files Y d. a digitized "picture" of a chart in one format and one layer 3105: An automatic identification system (AIS) transponder transmits and receives information broadcasts on _____?
N a. 10 cm, S-band radar N b. 3 cm, X-band radar N c. UHF L-band Y d. VHF maritime band