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.
4: Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are __________.
N a. accurate only in the Polar regions Y b. accurate electronic servomechanisms N c. hand operated N d. accurate only if the vessel is underway 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 109: While proceeding along the Norwegian coast on course 039°T, you sight the black-yellow-black banded buoy shown bearing 053°T. What action should you take? (D021NG )
N a. Alter course to 053° and leave the buoy close aboard on either side N b. Maintain course Y c. Alter course to 060° and ensure that the true bearings decreases N d. Alter course to port to rapidly open the bearing to the right 156: In reading a weather map, closely spaced pressure gradient lines would indicate __________.
Y a. high winds N b. high overcast clouds N c. calm or light winds N d. fog or steady rain 196: The area of strong westerly winds occurring between 40°S and 60°S latitude is called the __________.
N a. polar easterlies N b. prevailing westerlies Y c. roaring forties N d. jet streams 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 314: Which of these sextant errors is nonadjustable?
N a. Prismatic error N b. Graduation error N c. Centering error Y d. All of the above 335: What is the geographic longitude of a body whose GHA is 232°27'?
Y a. 127°33'E N b. 52°27'E N c. 61°52'W N d. 61°52'E 366: If an observer in the Northern Hemisphere faces the surface wind, the center of low pressure is to his______________.
N a. left, slightly behind him Y b. right, slightly behind him N c. left, slightly in front of him N d. right, slightly in front of him 373: How is a navigation light on the Mississippi River identified on an Army Corps of Engineers navigation map?
N a. Name and light characteristic Y b. Name and miles from a reference point N c. Light characteristic and miles A.H.P. N d. None of the above 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 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. 562: You wish to measure the distance on a Mercator chart between a point in latitude 42°30'N and a point in latitude 40°30'N. To measure 30 miles at a time you should set the points of the dividers at __________.
Y a. 41°15' and 41°45' N b. 41°45' and 42°15' N c. 42°15' and 42°45' N d. 42°00' and 42°30' 645: The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°, is the __________.
N a. altitude Y b. declination N c. latitude N d. azimuth angle 654: Your ARPA has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the ground. What should you expect under these circumstances?
N a. The generated CPA will be less than the actual CPA. N b. The generated TCPA will be later than the actual TCPA. N c. The range of initial target acquisition will be less than normal. Y d. The targets true course vector will be in error. 668: You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042° at 105 miles from you. What is the course to steer at 10 knots to intercept vessel A?
N a. 063° N b. 068° N c. 073° Y d. 079° 676: If you are caught in the left semicircle of a tropical storm, in the Southern Hemisphere, you should bring the wind __________.
N a. on the starboard quarter, hold course and make as much way as possible N b. 2 points on the port quarter, and make as much way as possible Y c. on the port bow, and make as much way as possible N d. dead ahead and heave to 723: If there is any doubt as to the proper operation of a radar, which statement is TRUE?
N a. Only a radar expert can determine if the radar is operating. N b. All radars have indicator lights and alarms to signal improper operation. Y c. A radar range compared to the actual range of a known object can be used to check the operation of the radar. N d. The radar resolution detector must be energized to check the radar. 827: The Benguela Current flows in a __________.
N a. SW'ly direction along the NW coast of Africa N b. S'ly direction off the East Coast of Australia Y c. NW'ly direction along the SW coast of Africa N d. SW'ly direction along the SE coast of Greenland 847: On a voyage from Halifax, N.S., to Dakar, West Africa, the Canary Current will __________.
N a. set the vessel to the left Y b. set the vessel to the right N c. offer resistance in the form of a head current N d. furnish additional thrust in the form of a fair or following current 893: One point of a compass is equal to how many degrees?
N a. 7.5 Y b. 11.25 N c. 17.5 N d. 22.5 905: The Sun's center is coincident with the principal vertical circle when __________.
Y a. in lower transit N b. the hour circle and prime vertical are coincident N c. the declination is zero degrees and the azimuth is exactly N 135°E N d. the declination is zero degrees and the azimuth is exactly N 135°W 909: What is the average speed of movement of a hurricane prior to recurvature?
N a. 4 to 6 knots N b. 6 to 8 knots Y c. 10 to 12 knots N d. 15 to 20 knots 929: Which error is NOT included in the term "current" when used in relation to a fix?
N a. Poor steering N b. Leeway Y c. Known compass error N d. Ocean currents 958: You are preparing a weather report form. Twenty-five percent of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 062° relative at 13 knots. You are on course 238°T at 22 knots. How should you encode group Nddff? (D041NG )
Y a. 20220 N b. 20613 N c. 30219 N d. 32413 993: When crossing the magnetic equator the __________.
N a. Flinders bar should be inverted Y b. heeling magnet should be inverted N c. the quadrantal spheres should be rotated 180° N d. Flinders bar should be moved to the opposite side of the binnacle 1032: What is the approximate geographic range of Point Judith Light, Rhode Island, if your height of eye is 62 feet (18.9 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS" .
N a. 9.6 nm N b. 16.5 nm Y c. 18.6 nm N d. 20.7 nm 1033: Deviation which is maximum on intercardinal compass headings may be removed by the __________.
N a. Flinders bar N b. transverse magnets N c. fore-and-aft magnets Y d. soft iron spheres on the sides of the compass 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 1127: In a river subject to tidal currents, the best time to dock a ship without the assistance of tugs is __________.
Y a. at slack water N b. at flood tide N c. when there is a following current N d. at high water 1137: When the declination of the Moon is 0°12.5'S, you can expect some tidal currents in Gulf Coast ports to __________.
Y a. become weak and variable N b. exceed the predicted velocities N c. become reversing currents N d. have either a double ebb or a double flood 1139: A star is observed at lower transit. The line of position derived from this sight is __________.
N a. on the prime vertical Y b. a latitude line N c. a longitude line N d. of no special significance 1157: How many slack tidal currents usually occur each day on the east coast of the United States?
N a. One N b. Two N c. Three Y d. Four 1303: Compass deviation is caused by __________.
N a. magnetism from the earth's magnetic field N b. misalignment of the compass Y c. magnetism within the vessel N d. a dirty compass housing 1443: At the master gyrocompass, the compass card is attached to the __________.
N a. spider element Y b. sensitive element N c. link arm N d. pickup transformer 1455: Inferior conjunction is possible for __________.
Y a. Mercury N b. Saturn N c. Mars N d. Jupiter 1476: When warm moist air blows over a colder surface and is cooled below its dew point, the result is __________.
N a. radiation fog N b. ice fog Y c. advection fog N d. frost smoke 1518: Which publication requires infrequent corrections?
N a. List of Lights N b. Coast Pilot Y c. Sailing Directions (Planning Guide) N d. Radio Navigational Aids 1535: When observing a rapid rise in barometric pressure, you may expect __________.
N a. clear weather with no wind, but the possibility of rain or snow within 24 hours N b. deteriorating weather with rain or snow N c. heavy rain or severe thundershowers Y d. clearing weather, possibly accompanied by high winds 1629: Air temperature varies with __________.
N a. the altitude above sea level N b. the season of the year N c. the latitude or distance from the equator Y d. All of the above 1710: A gale is characterized by a wind speed of __________.
N a. 10 to 20 knots Y b. 34 to 47 knots N c. 48 to 63 knots N d. 64 to 83 knots 1770: A Doppler speed log indicates speed over ground __________.
N a. at all times Y b. in the bottom return mode N c. in the volume reverberation mode N d. only when there is no current 2098: 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 magnets Y c. Fore-and-aft magnets N d. Athwartships magnets 2168: By convention, the north pole of a magnet is painted __________.
Y a. red N b. blue N c. white N d. black 2170: The temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur is referred to as the __________.
N a. precipitation point N b. vapor point Y c. dew point N d. absolute humidity 2187: The 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. No lights N b. Three red lights N c. Two red lights Y d. One red lights 2366: The major problem with Moon sights is the __________.
N a. rapid changes in GHA and declination introduce errors into the calculations Y b. lack of a well defined limb during certain phases and positions in the sky N c. approximations used in the solution caused by the variable horizontal parallax N d. augmentation effect caused by the relatively short distance to the Moon 2384: On U.S. charts, you can tell if a named feature such as a rock (i.e. Great Eastern Rock in Block Island Sound) is submerged by the __________.
N a. color of ink used to print the name Y b. style of type used to print the name N c. dashed circle around the feature N d. magenta circle around the feature 2394: A vessel is heading magnetic east and its magnetic compass indicates a heading of 093°. What action should be taken to remove this error during compass adjustment?
N a. If the red ends of the magnets are aft, and the fore-and-aft tray is at the top, you should remove some magnets. N b. If the red ends of the magnet are aft, and the fore-and-aft tray is at the bottom, you should reverse the magnets. Y c. If the red ends of the magnets are aft you should raise the fore-and-aft tray. N d. If the blue ends of the magnets are forward you should remove some magnets from the fore-and-aft tray. 2419: A backlash below a lock is defined as a __________.
N a. current setting your vessel on the wall N b. current setting into the lock chamber Y c. an eddy working along the lower guide wall N d. current setting counterclockwise 2426: You are in charge of a power-driven vessel crossing a river on the Western Rivers. You must keep out of the way of __________.
N a. a sail vessel descending the river N b. a power-driven vessel ascending the river N c. a vessel restricted in its ability to maneuver crossing the river Y d. All of the above 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° 2602: The lunar day is also known as the __________.
N a. lunitidal interval N b. vulgar establishment of the port N c. nodal day Y d. tidal day 2604: A sidereal day is approximately how much shorter than a solar day?
Y a. 4 minutes N b. 8 minutes N c. 12 minutes N d. 16 minutes 2609: The letter A in illustration D006NG represents the __________. (D006NG )
N a. geoidal horizon N b. celestial horizon N c. visible horizon Y d. sensible horizon 2650: In the celestial equator system of coordinates what is equivalent to the colatitude of the Earth system of coordinates?
N a. Coaltitude N b. Zenith distance Y c. Polar distance N d. Declination 2708: You are approaching a drawbridge and have sounded the proper whistle signal requesting it to open. You hear a signal of one prolonged and one short blast from the bridge. Which action should you take?
N a. Anchor or use an alternate route because the bridge is out of service for an extended period of time. N b. Approach to a point not closer than 400 yards (360 meters) from the bridge and await further signals. N c. Hold in the channel as the bridge will open within 15 minutes. Y d. Approach under full control to pass through the bridge. 2998: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 3 1/2 seconds after the signal was sounded. What is the distance to the shore?
Y a. 640 yards N b. 480 yards N c. 315 yards N d. 143 yards 3013: A white buoy with an orange rectangle on it displays __________.
Y a. directions N b. dangers N c. exclusion areas N d. All of the above 3040: Which instrument is used to predict the approach of a low pressure system?
N a. Anemometer N b. Fathometer Y c. Barometer N d. Thermometer