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.
31: When approaching a preferred-channel buoy, the best channel is NOT indicated by the __________.
Y a. light characteristic N b. color of the uppermost band N c. shape of an unlighted buoy N d. color of the light 63: A "full service" Loran-C receiver will provide __________.
N a. matching pulse rates of at least 20 stations N b. an automatic on-and-off switch N c. a horizontal matching of all delayed hyperbolic signals Y d. automatic signal acquisition and cycle matching 84: When using an echo sounder in deep water, it is NOT unusual to __________.
Y a. receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night N b. receive a first return near the surface during the day, and a strong return at about 200 fathoms (366 meters) at night N c. receive false echoes at a constant depth day and night N d. have to recalibrate every couple of days due to inaccurate readings 86: A weather forecast states that the wind will commence backing. In the Northern Hemisphere, this would indicate that it will __________.
N a. shift in a clockwise manner Y b. shift in a counterclockwise manner N c. continue blowing from the same direction N d. decrease in velocity 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 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 226: What winds blow towards the equator from the area about 30° north?
N a. Prevailing westerlies N b. Roaring thirties N c. Equatorial flow Y d. Northeast trades 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 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) 284: The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator. An error NOT correctable by the navigator is __________.
N a. index error Y b. prismatic error N c. perpendicularity of the horizon glass N d. perpendicularity of the index mirror 313: The Loran-C receiver __________.
N a. is not affected by interference N b. can be used at any distance with accuracy Y c. can be affected by interference N d. is reliable only from sunrise to sunset 320: Sometimes foreign charts are reproduced by NGA (NIMA). On such a chart, a wire-dragged, swept area may be shown in green or __________.
N a. red N b. black Y c. purple N d. yellow 380: Prevailing winds between 30°N and 60°N latitude are from the __________.
N a. east Y b. west N c. north N d. south 428: A buoy bears 178°T at 3000 yards (2700 meters). What is the course to make good to leave the buoy 100 yards (90 meters) to starboard?
N a. 174°T Y b. 176°T N c. 178°T N d. 180°T 428: A buoy bears 178°T at 3000 yards (2700 meters). What is the course to make good to leave the buoy 100 yards (90 meters) to starboard?
N a. 174°T Y b. 176°T N c. 178°T N d. 180°T 438: Your longitude is 124°E, and your local mean time is 0520 on the 5th of the month. The mean time and date at Greenwich is __________.
N a. 1336 on the 4th N b. 1336 on the 5th Y c. 2104 on the 4th N d. 2104 on the 5th 499: Which of the symbols shown represents an occluded front? (D018NG )
N a. A N b. B N c. C Y d. D 522: All straight lines represent great circle tracks on a chart based on a(n) __________.
N a. Mercator projection N b. polyconic projection N c. orthographic projection Y d. gnomonic projection 599: Magnetic compass deviation __________.
N a. varies depending upon the bearing used Y b. is the angular difference between magnetic north and compass north N c. is published on the compass rose on most nautical charts N d. is the angular difference between geographic and magnetic meridians 632: You must construct a Mercator projection for an area bounded by latitudes 40° - 47°N and longitudes 176°E to 176°W on a paper 28 X 36 inches. Allow a neat line of one inch. What will be the separation between meridians?
N a. 3.190 inches Y b. 3.249 inches N c. 3.529 inches N d. 3.714 inches 638: Swell is the rise and fall of the ocean's surface due to __________.
N a. fetch Y b. distant winds N c. local storms N d. the pull of the moon 669: It is desirable that a vessel encountering hurricane or typhoon conditions sends weather reports to the closest meteorological service at least every __________.
N a. hour Y b. 3 hours N c. 6 hours N d. 8 hours 671: You sight a buoy fitted with a double-sphere topmark. If sighted at night, this buoy would show a __________.
N a. quick-flashing red light N b. quick-flashing green light Y c. flashing white light showing a group of two flashes N d. flashing red light showing a group of three flashes 801: You are entering an African port and see ahead of you a red can-shaped buoy. What action should you take?
Y a. Alter course to leave the buoy to port N b. Alter course to leave the buoy to starboard N c. Pass the buoy close aboard on either side N d. Pass the buoy well clear on either side 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 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 933: How many degrees are there on a compass card?
Y a. 360° N b. 380° N c. 390° N d. 420° 979: Which kind of conditions would you observe as the eye of a storm passes over your vessel's position?
Y a. Huge waves approaching from all directions, clearing skies, light winds, and an extremely low barometer N b. Flat calm seas, heavy rain, light winds, and an extremely low barometer N c. Flat calm seas, heavy rain, light winds, and high pressure N d. Huge waves approaching from all directions, clearing skies, light winds, and high pressure 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 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 1175: Solid green arrows on the main body of a pilot chart indicate __________.
N a. prevailing wind directions Y b. prevailing ocean current directions N c. probable surface current flow N d. shortest great circle routes 1181: An occulting light is one in which __________.
N a. the period of darkness exceeds the period of light N b. there is only a partial eclipse of the light N c. the periods of light and darkness are equal Y d. the period of light exceeds the period of darkness 1192: You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 284°T at 43 miles from you. What is the course to steer at 16 knots to intercept vessel A?
N a. 284° Y b. 303° N c. 329° N d. 342° 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 1365: The same side of the Moon is always toward the Earth, but more than half of its surface has been seen due to libration. Libration in latitude occurs because __________.
Y a. the axis of rotation is tilted about 6.5° to the axis of revolution N b. the speed of revolution varies, while the rotational speed is essentially constant N c. of the rotational oscillation of the Moon with respect to its radius vector N d. of augmentation 1492: You are planning a voyage from San Francisco to Japan. Which publication contains information on the ocean routes?
N a. Coast Pilot Y b. Sailing Directions (Planning Guide) N c. Sailing Directions (Enroute) N d. World Port Index 1694: In the Southern Hemisphere the wind circulation in a high pressure system rotates __________.
N a. clockwise and inward N b. clockwise and outward Y c. counterclockwise and outward N d. counterclockwise and inward 1703: In the Northern Hemisphere, when the wind at your location is northerly, the low pressure center causing the wind is located to your __________.
N a. NNW N b. WSW Y c. ESE N d. SSW 1711: An instrument that indicates wind direction is known as a(n) __________.
Y a. weather vane, wind vane or wind sock N b. hydrometer N c. hygrometer N d. sling psychrometer 1720: In the Southern Hemisphere winds in a low pressure system rotate in a __________.
Y a. clockwise direction N b. northeasterly direction N c. northerly direction N d. counterclockwise direction 1779: The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 14 miles and your height of eye is 20 feet, at which approximate distance will you sight the light?
N a. 7.5 miles Y b. 11.2 miles N c. 14.0 miles N d. 18.1 miles 1789: 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? (D036NG )
Y a. One red light N b. Two green lights N c. Three green lights N d. No light(s) 1812: The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value?
N a. 80° N b. 83° N c. 85° Y d. 87° 1869: 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 B in the illustration? (D036NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No light 1918: The Moon appears larger in diameter at the zenith than when near the horizon. What is this called?
N a. Parallax in altitude Y b. Augmentation N c. Horizontal parallax N d. Libration 2072: The Illustration represents a movable dam. If a bear trap is open what will be displayed at the lock to indicate this condition? (D037NG )
Y a. An amber light under a red light N b. A white square N c. A green triangle N d. A yellow pentagon 2076: You should plot your dead reckoning position __________.
Y a. from every fix or running fix N b. from every estimated position N c. every three minutes in pilotage waters N d. only in pilotage waters 2091: The velocity of the current in large coastal harbors is __________.
N a. unpredictable N b. generally constant N c. generally too weak to be of concern Y d. predicted in Tidal Current Tables 2207: Yesterday your chronometer read 11h 59m 58s at the 1200 GMT time tick. Today your chronometer reads 12h 00m 00s at the 1200 time tick. What is the chronometer rate?
N a. Nil N b. 12h Y c. +2s N d. -2s 2211: What is the length of a nautical mile?
N a. 1,850 meters Y b. 6,076 feet N c. 5,280 feet N d. 2,000 yards 2380: The navigation regulations applicable to a U.S. inland waterway can be found in the __________.
N a. Notices to Mariners N b. Channel Reports N c. Sailing Directions Y d. Coast Pilots 2516: Apparent time is based on __________.
N a. a fictitious sun moving along the celestial equator Y b. the visible sun moving along the ecliptic N c. the Moon's motion in relation to the Sun N d. the movement of the first point of Aries 2570: A plane that cuts the Earth's surface and passes through the poles will always form __________.
N a. the equator N b. a loxodromic curve N c. a small circle Y d. a meridian 2746: What is used to measure wind velocity?
N a. Psychrometer N b. Barometer N c. Wind sock Y d. Anemometer 2860: On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. It is caused by __________.
N a. warm air passing over much colder water Y b. cold air passing over much warmer water N c. a rapid cooling of the ground on a clear night N d. rain coming out of a warm air mass aloft 2880: While upbound through Memphis, the weather report on the TV news indicates that a cold front will cross western Kentucky and Tennessee the next morning. What weather should accompany this front?
N a. Light, southerly winds; high humidity and possibly fog N b. Overcast with steady, light rain or drizzle Y c. Gusting winds shifting to the northwest with thunderstorms N d. Scattered clouds with light to moderate southeasterly winds and possibly fog 2932: If the main channel under a bridge is marked with lights of the lateral system the adjacent bridge piers should be marked with __________.
N a. occulting white lights Y b. fixed yellow lights N c. fixed white lights N d. flashing yellow lights 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 3063: Which of the following must the electronic chart of an ECDIS display, as required by IMO/IHO?
N a. Hydrography N b. Ferry routes N c. Regulatory boundaries Y d. All of the above 3107: Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT __________.
Y a. Port of origin N b. Name of vessel N c. Course and speed over ground N d. Draft of vessel