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.
62: Charted depth is the __________.
N a. vertical distance from the chart sounding datum to the ocean bottom, plus the height of tide Y b. vertical distance from the chart sounding datum to the ocean bottom N c. average height of water over a specified period of time N d. average height of all low waters at a place 103: In Loran-C the high accuracy of atomic time and frequency controls allows each station to operate __________.
N a. at higher frequencies Y b. on schedule, independently N c. at 1,975 kHz N d. in a multiplex phase 125: The GMT is 0445 and your zone description is +1. Your zone time is __________.
N a. 0445 Y b. 0345 N c. 0545 N d. 1545 127: Mean low water is the average height of __________.
N a. the surface of the sea N b. high waters and low waters Y c. all low waters N d. the lower of the two daily low tides 130: The distance between the surface of the water and the tidal datum is the __________.
N a. range of tide Y b. height of tide N c. charted depth N d. actual water depth 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 171: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
Y a. safe water N b. a fish trap area N c. a hazard to navigation N d. a bifurcation in the channel 194: The horizon glass of a sextant is __________.
Y a. silvered on its half nearer the frame N b. mounted on the index arm N c. between the horizon and the shade glasses N d. All of the above 199: Civil twilight occurs at 0558 zone time on 30 December 1981. Your DR position at that time is LAT 15°02'N, LONG 46°02'W. Which statement concerning the planets available for morning sights is TRUE?
Y a. At 0558, Mars can be used for an ex-meridian observation. N b. Venus, Jupiter, and Mars sights will yield a good three line fix. N c. Saturn will be near the prime vertical. N d. Venus will be visible low in the western sky. 234: When the declination of the Moon is 0°12.5'S, you can expect some tidal currents in Gulf Coast ports to __________.
N a. exceed the predicted velocities N b. become reversing currents N c. have either a double ebb or a double flood Y d. become weak and variable 257: Spring tides occur __________.
N a. at the start of spring, when the Sun is nearly over the equator N b. only when the Sun and Moon are on the same side of the Earth and nearly in line N c. when the Sun and Moon are at approximately 90° to each other as seen from the Earth Y d. when the Sun, Moon, and Earth are nearly in line, in any order 357: On 10 August 1983 you will dock near Days Point, Weehawken, on the Hudson River, at 1800 DST (ZD +4). The charted depth alongside the pier is 24 feet (7.3 meters). What will be the depth of water when you dock?
N a. 23.5 feet (7.1 m) Y b. 23.9 feet (7.2 m) N c. 24.9 feet (7.5 m) N d. 26.3 feet (8.0 m) 385: The difference of latitude (l) between the geographic position (GP) of a celestial body and your position, at the time of upper transit, is represented by __________.
N a. colatitude N b. codistance Y c. zenith distance N d. altitude 451: Which light characteristic may be used on a special purpose mark?
Y a. Fixed N b. Occulting N c. Equal interval N d. Quick flashing 471: Yellow lights may appear on __________.
Y a. special purpose buoys N b. vertically-striped buoys N c. horizontally-banded buoys N d. spherical buoys 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 493: The picture shown represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? (D011NG )
N a. Ship No. 1 is not detected due to the shadow effect of the headland. N b. The small island is not detected due to the effect of beam width. Y c. A tangent bearing of the headland to the south-southeast should be corrected by adding one-half of the beam width. N d. Ship No. 2 is not detected due to the reflective mass of the background mountain overpowering the ship's reflective signals. 627: You are on a coastwise voyage bound for Marcus Hook, PA. Your speed is 15 knots. You wish to use the flood tide to facilitate docking starboard side to, heading seaward. To have the most favorable tide throughout, you should time your arrival at the entrance to Delaware Bay __________.
N a. for 1 hour before flood begins N b. for 1 hour after flood begins Y c. for 3 hours after flood begins N d. for 1 hour before ebb begins 633: You have another ship overtaking you close aboard to starboard. You have 3 radar targets bearing 090° relative at ranges of .5 mile, 1 mile, and 1.5 miles. In this case, the unwanted echoes are called __________.
Y a. multiple echoes N b. spoking N c. indirect echoes N d. side-lobe echoes 816: Cyclones that have warm sectors usually move __________.
N a. westerly Y b. parallel to the isobars in the warm sector N c. toward the nearest high pressure area N d. faster than the accompanying cold front 817: Which current would you encounter on a direct passage from London, England, to Cape Town, South Africa?
N a. Falkland Current N b. Brazil Current N c. Norway Current Y d. Benguela Current 822: Charts should be corrected by using information published in the __________.
N a. Light List N b. American Practical Navigator Y c. Notice to Mariners N d. Coast Pilot 897: What current flows southward along the west coast of the United States and causes extensive fog in that area?
N a. Davidson Current N b. North Pacific Current N c. Alaska Current Y d. California Current 900: An orange and white buoy with a rectangle on it is a(n) __________.
Y a. informational buoy N b. junction buoy N c. safe water buoy N d. All of the above 940: What is the length of a nautical mile?
Y a. 6,076 feet N b. 5,280 feet N c. 2,000 yards N d. 1,850 meters 973: The heading of a vessel is indicated by what part of the compass?
N a. Card N b. Needle Y c. Lubber's line N d. Gimbals 985: A time diagram is a diagram on the plane of the __________.
N a. celestial meridian Y b. celestial equator N c. celestial horizon N d. principal vertical circle 1019: You are preparing a weather report form, WS Form B-80. The dry bulb thermometer reads 30°F (-1°), and the wet bulb thermometer reads 28°F (-2°C). Using the Ships Code Card, how would you encode the air temperature groups in the report? (D041NG )
N a. 10011, 2003/ N b. 11300, 2124/ N c. 11011, 2124/ Y d. 11011, 2104/ 1093: The Flinders bar on a magnetic compass compensates for the __________.
Y a. induced magnetism in vertical soft iron N b. induced magnetism in horizontal soft iron N c. permanent magnetism in ship's steel N d. vessel's inclination from the vertical 1099: You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 343°T at 92 miles from you. What is the course to steer at 9 knots to intercept vessel A?
N a. 356° Y b. 003° N c. 022° N d. 038° 1129: The motion of celestial bodies relative to other celestial bodies is known as __________.
Y a. space motion N b. apparent motion N c. diurnal motion N d. actual motion 1222: On entering from seaward, a starboard side daymark will __________.
N a. show a fixed red light if lighted N b. show a Morse (A) white light N c. be square in shape Y d. have an even number if numbered 1225: The term "Western Rivers," when it refers to regulations requiring towing vessels to carry navigational-safety equipment, charts or maps, and publications, includes the _____________ .
N a. Mississippi River and its tributaries N b. Port Allen - Morgan City Alternate Route N c. Red River and the Old River Y d. All of the above 1228: "An electronic or electric device that indicates the rate of turn of a vessel," defines a/an _____________ .
N a. magnetic compass N b. gyro-compass Y c. swing meter N d. odometer 1256: A cold front moving in from the northwest can produce __________.
Y a. thunderstorms, hail, and then rapid clearing N b. increasing cloud cover lasting for several days N c. lengthy wet weather N d. low ceilings with thick cirrus clouds 1266: A line of clouds, sharp changes in wind direction, and squalls are most frequently associated with a(n) __________.
N a. occluded front N b. warm front Y c. cold front N d. warm sector 1555: Under the U.S. Aids to Navigation System, a yellow buoy is a __________.
N a. safe water buoy N b. junction buoy N c. cardinal mark Y d. special purpose mark 1574: Information about currents around Pacific Coast ports of the U.S. is found in the __________.
N a. Nautical Almanac N b. Tide Tables Y c. Tidal Current Tables N d. Ocean Current Tables 1637: Which of the following is NOT a form of precipitation?
N a. rain Y b. frost N c. sleet N d. snow 1698: When a high pressure system is centered north of your vessel in the Northern Hemisphere __________.
N a. you should experience hot, moist, clear weather Y b. the wind direction is generally easterly N c. the winds should be from the southwest at your location N d. the winds should be brisk 1765: Which meteorological feature controls the climate of the Gulf and the Gulf Coast area during late spring and summer?
Y a. The Bermuda High N b. The doldrums N c. The horse latitudes N d. Tropical cyclones 1987: An instrument useful in predicting fog is the __________.
Y a. sling psychrometer N b. microbarograph N c. anemometer N d. aneroid barometer 2018: Which magnetic compass corrector(s) can be set while the vessel is on a heading of magnetic east or magnetic west?
N a. Quadrantal spheres N b. Heeling magnet Y c. Flinders bar N d. Athwartships magnets 2165: The illustration 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? (D037NG )
Y a. Three red lights N b. Two red lights N c. One red light N d. One amber light 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 2177: This diagram 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? (D037NG )
N a. One amber light N b. Three red lights N c. Two red lights Y d. One red light 2269: One of the factors which affects the circulation of ocean currents is __________.
N a. humidity Y b. varying densities of water N c. vessel traffic N d. the jet stream 2314: A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. What action should be taken to remove this error during compass adjustment?
N a. If the blue ends of the magnets are forward you should raise the fore-and-aft tray. N b. If the blue ends of the magnets are aft you should lower the fore-and-aft tray. Y c. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the top, you should add some magnets. N d. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the bottom, you should reverse the magnets. 2350: The principal advantage of NAVTEX radio warnings is that __________.
Y a. they can be used by mariners who do not know Morse code N b. only an ordinary FM radio is necessary to receive these warnings N c. information on a given topic is only broadcast at specified times N d. they cover a broad spectrum of the radio band allowing reception on almost any type of receiver 2454: Illustration D037NG represents a moveable dam. If the wickets are down and there are open weirs due to high water, what light(s) will be shown at C if the lock walls and piers are not awash? (D037NG )
N a. One red light Y b. Two red lights N c. Three red lights N d. One amber light 2460: You are on course 344°T and take a relative bearing of a lighthouse of 270°. What is the true bearing to the lighthouse?
N a. 016° N b. 074° N c. 090° Y d. 254° 2522: The letter H in illustration D006NG represents the __________. (D006NG )
N a. celestial horizon N b. geoidal horizon Y c. visible horizon N d. refractive horizon 2774: Your radar is set on a true motion display. Which of the following will NOT appear to move across the PPI scope?
Y a. Echoes from a buoy N b. Own ship's marker N c. Echo from a ship on the same course at the same speed N d. Echo from a ship on a reciprocal course at the same speed 2800: Where is the pivot point of a towboat with a tow ahead?
N a. One-third the length of the combined unit forward of the towboat Y b. One-third the length of the combined unit back from the head N c. At the head of the towboat N d. One-half the length of the combined unit 2814: In low latitudes the range of the diurnal variation of pressure is up to __________.
N a. 0.5 millibar Y b. 3.0 millibars N c. 6.0 millibars N d. 10.0 millibars 2890: While passing through Memphis, the weather report on the TV news indicates that a cold front is crossing western Kentucky and Tennessee. Tomorrow's weather will be dominated by a high pressure area. What weather should you expect tomorrow?
N a. Light, southerly winds; high humidity and possibly fog Y b. Moderate winds from the northwest, clear visibility and cooler temperatures N c. Low overcast; mild temperatures with light, steady rain or drizzle N d. Scattered clouds with light, southeasterly winds; high humidity and possibly fog 2959: Vessels required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
N a. time of the next navigational satellite N b. distance to the next port Y c. speed of the vessel over the ground or through the water N d. None of the above 3024: Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN ?
N a. C 018°T, Sp 6 knots N b. C 079°T, Sp 24 knots N c. C 101°T, Sp 7 knots Y d. C 349°T, Sp 25 knots 3053: The vertical distance from the tidal datum to the level of the water is the __________.
Y a. height of tide N b. range of tide N c. actual water depth N d. charted depth 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