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.
68: A position obtained by taking lines of position from one object at different times and advancing them to a common time is a(n) __________.
N a. dead-reckoning position N b. estimated position N c. fix Y d. running fix 164: The part of a sextant mounted directly over the pivot of the index arm is the __________.
Y a. index mirror N b. horizon glass N c. micrometer drum N d. telescope 329: The symbols shown are used on radio facsimile weather charts. Which symbol indicates a weather boundary? (D042NG )
N a. I N b. H N c. G Y d. F 334: The index error is determined by adjusting the __________.
N a. sextant frame N b. horizon glass N c. index mirror Y d. micrometer drum 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 359: You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 264°T, 68 miles from you. What is the time to intercept if you make 13 Knots?
N a. 6h 31m N b. 6h 47m N c. 7h 03m Y d. 7h 34m 370: Prevailing winds between 30°N and 60°N latitude are from the __________.
N a. north N b. south N c. east Y d. west 374: There are seven sources of error in the marine sextant. Of the four errors listed, which one is adjustable?
Y a. Error of collimation N b. Prismatic error N c. Graduation error N d. Centering error 375: If the Sun's observed altitude is 47°50', the zenith distance is __________.
Y a. 42°10' N b. 42°50' N c. 47°50' N d. 132°10' 378: A navigator fixing a vessel's position by radar __________.
N a. should never use radar bearings Y b. can use radar information from one object to fix the position N c. should only use radar bearings when the range exceeds the distance to the horizon N d. must use information from targets forward of the beam 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 458: The prevailing westerlies of the Southern Hemisphere blow 18-30 knots __________.
Y a. all year long N b. during the summer months only N c. during the winter only N d. during spring only 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. 481: A special mark (yellow buoy), if lighted, may exhibit which light rhythm?
Y a. Flashing N b. Morse "A" N c. Equal interval N d. Occulting 556: In a tropical cyclone in the Northern Hemisphere, a vessel hove to with the wind shifting counterclockwise would be __________.
Y a. in the navigable semicircle N b. in the dangerous semicircle N c. directly in the path of the center N d. ahead of the storm 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 611: Information markers, when lighted, will display __________.
N a. yellow lights N b. green lights Y c. white lights N d. red lights 722: Which publication would describe the explosive anchorages in the ports on the east coast of the United States?
N a. Sailing Directions N b. Pilot Rules for Inland Waters Y c. Coast Pilot N d. Notice to Mariners 779: Which sextant shown has an index error of 0'20" on the arc? (D050NG )
N a. A N b. B Y c. C N d. D 895: The ecliptic is __________.
Y a. the path the Sun appears to take among the stars N b. the path the Earth appears to take among the stars N c. a diagram of the zodiac N d. a great circle on a gnomonic chart 903: Eight points of a compass are equal to how many degrees?
N a. 45 Y b. 90 N c. 180 N d. 360 952: What is TRUE concerning new editions of Light Lists?
N a. Supplements to new editions are issued monthly by the U.S. Coast Guard. N b. New editions are published by the National Ocean Service. Y c. New editions are corrected through the date shown on the title page. N d. None of the above 1056: The steepness of a cold front depends on __________.
N a. the direction of wind around the front Y b. its velocity N c. the temperature of the air behind the front N d. the precipitation generated by the front 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 1206: Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.
N a. passage of a warm front Y b. passage of a cold front N c. winds shifting counterclockwise in the Northern Hemisphere N d. stationary high pressure systems 1213: If the magnetic heading is greater than the compass heading, the deviation is __________.
Y a. east N b. west N c. north N d. south 1233: Deviation is the angle between the __________.
N a. true meridian and the axis of the compass card N b. true meridian and the magnetic meridian Y c. magnetic meridian and the axis of the compass card N d. axis of the compass card and the degaussing meridian 1275: How is variation indicated on a small-scale nautical chart?
N a. Magnetic compass table N b. Magnetic meridians Y c. Isogonic lines N d. Variation is not indicated on small-scale nautical charts. 1314: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates hail? (D042NG )
N a. N Y b. H N c. Q N d. F 1439: The symbols shown are used on radio facsimile weather charts. The symbol indicated at letter "G" represents a __________. (D042NG )
N a. weather boundary N b. thunderstorm N c. wide spread sandstorm Y d. severe, line squall 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. 1495: A great circle crosses the equator at 157°W. It will also cross the equator at what other longitude?
N a. 157°E N b. 57°E Y c. 23°E N d. 57°W 1524: A barometric pressure reading of 29.92 inches of mercury is equivalent to __________.
Y a. 1013.25 millibars N b. 29.92 feet of water N c. 766 millimeters of mercury N d. 76 centimeters of water 1547: Which light combination does NOT indicate a navigational channel passing under a fixed bridge?
Y a. Red lights on the LDB and green lights on the RDB N b. Three white lights in a vertical line N c. Two green lights in a range under the span N d. A fixed red light on each pier at the channel edge 1581: Shown are the symbols used on radio facsimile weather charts. The symbol indicated at letter "I" represents __________. (D042NG )
N a. rain showers Y b. thunderstorms N c. snow storms N d. sand storms 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 1648: A sign of thunderstorm development is a cumulus cloud __________.
N a. darkening, growing in size and forming an anvil top N b. that shows extensive vertical development N c. creating cold downdrafts that are felt on the ground Y d. All of the above 1785: Which factor(s) is/are used to develop the charted information of a lighthouse?
N a. Height of the light and the observer Y b. Height and brightness of the light N c. Brightness of the light and height of the observer N d. Height of the light only 1801: A phenomenon where the atmospheric pressure is higher than that of other surrounding regions is called __________.
N a. the "trade winds" Y b. an anticyclone N c. a low front or an occluded front N d. the "doldrums" 1844: What is the relative bearing of an object sighted dead ahead?
N a. 180° N b. 090° N c. 015° Y d. 000° 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 2030: A vessel heading NE is on a course of __________.
N a. 022.5° Y b. 045.0° N c. 067.5° N d. 090.0° 2062: The Illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter F in the illustration? (D038NG )
Y a. One red light N b. Two red lights N c. Two green lights N d. Three green lights 2141: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
N a. Red over green N b. Green over red Y c. Red over amber (yellow) N d. Green over amber (yellow) 2145: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
N a. Green over red N b. Red over blue N c. Green over amber (yellow) Y d. Red over amber (yellow) 2219: A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 317°. What action should be taken to remove this error during compass adjustment?
Y a. If the quadrantal spheres are in as far as possible replace them with larger spheres. N b. If the quadrantal spheres are in as far as possible replace them with smaller spheres. N c. If the quadrantal spheres are in as far as possible move the quadrantal spheres out. N d. If the spheres are in as far as possible remove one of the spheres. 2284: Bellatrix is found in what constellation?
N a. Canis Minor N b. Gemini N c. Taurus Y d. Orion 2378: Which light signal indicates that you may approach the lock?
N a. Flashing red Y b. Flashing amber N c. Steady amber N d. Steady green 2404: The dividing meridian between zone descriptions +7 and +8 is __________.
N a. 105°00'W Y b. 112°30'W N c. 117°00'W N d. 120°30'W 2440: You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse?
N a. 003° N b. 227° Y c. 177° N d. 363° 2482: When a vessel changes course from one cardinal heading to another cardinal heading while adjusting the compass, which action should be taken?
N a. The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings. Y b. After the new heading is reached, the vessel should steam on that course for at least two minutes before the adjustment. N c. During the course change, you should gently tap the compass to remove any error caused by friction on the pivot bearing. N d. After steadying on the new heading, the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error. 2505: At the approaches to Savannah, GA, with the wind coming out of the west, the wind-driven current will be flowing approximately __________.
N a. 280° N b. 260° N c. 100° Y d. 080° 2618: You must draw a plotting sheet covering latitudes 38°N to 43°N and longitudes 179°E to 178°W. If the distance between each degree of longitude is 5 inches, what is the distance between latitude 38°N and latitude 43°N?
N a. 29.0 inches N b. 29.6 inches N c. 32.1 inches Y d. 32.8 inches 2690: Right ascension is primarily used by the navigator for __________.
N a. calculating amplitudes N b. calculating great circle sailings by the Ageton method N c. entering the Air Navigation Tables (Selected Stars) Pub 249 Y d. plotting on star finders 2696: You must draw a plotting sheet covering latitudes 52°S to 56°S and longitudes 179°W to 175°E. If the distance between latitude 52°S to 56°S is 24 inches, what is the distance between the meridians of 1° of longitude?
N a. 3.2 inches Y b. 3.5 inches N c. 4.0 inches N d. 4.2 inches 2702: You must draw a plotting sheet covering latitudes 46°N to 48°N and longitudes 179°E to 178°W. If the distance between each degree of longitude is 2 7/8 inches, what is the distance between latitude 46°N and 48°N?
Y a. 8.4 inches N b. 8.1 inches N c. 7.9 inches N d. 7.7 inches 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 2738: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 3 seconds after the signal was sounded. What is the distance to the shore?
N a. 1100 yards N b. 872 yards Y c. 550 yards N d. 792 yards 2750: When pushing a tow and approaching barges tied off to the shore, you should __________.
N a. increase speed so you will pass faster Y b. decrease speed while passing so you won't create a suction N c. do nothing different as the barges should be tied off properly N d. move to the opposite side of the channel from the barges and increase speed 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