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.
39: Civil twilight begins at 1910 zone time on 20 July 1981. Your DR position at that time is LAT 22°16'N, LONG 150°06'W. Which statement concerning the planets available for evening sights is TRUE?
Y a. Venus will have a westerly meridian angle. N b. Mars will set about one hour after the Sun sets. N c. Mars, Venus, Jupiter, and Saturn will be above the horizon. N d. Sights of Saturn, Jupiter, and Venus will yield a good three-line-of-position fix. 144: In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n) __________.
N a. transmitter Y b. transducer N c. transceiver N d. amplifier 176: Which wind pattern has the most influence over the movement of frontal weather systems over the North American continent?
N a. Subpolar easterlies N b. Northeast trades Y c. Prevailing westerlies N d. Dominant southwesterly flow 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. 219: The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1300 and turn for 13 knots, at what point will you lose the flood current?
N a. Mile 52 N b. New Castle N c. Marcus Hook Y d. Billingsport 236: The winds with the greatest effect on the set, drift, and depth of the equatorial currents are the __________.
N a. doldrums N b. horse latitudes Y c. trade winds N d. prevailing westerlies 294: What is a nonadjustable error of the sextant?
Y a. Prismatic error N b. Index error N c. Side error N d. Error of collimation 407: What would be the height of the tide at Crisfield, MD, at 0310 DST (ZD +4) on 6 May 1983?
N a. 0.1 foot Y b. 0.5 foot N c. 1.1 feet N d. 1.6 feet 411: When entering from seaward, a buoy displaying a single-flashing red light would indicate __________.
N a. a junction with the preferred channel to the left N b. a sharp turn in the channel to the right Y c. the starboard side of the channel N d. a wreck to be left on the vessel's port side 466: In the relatively calm area near the hurricane center, the seas are __________.
N a. moderate but easily navigated N b. calm Y c. mountainous and confused N d. mountainous but fairly regular as far as direction is concerned 466: In the relatively calm area near the hurricane center, the seas are __________.
N a. moderate but easily navigated N b. calm Y c. mountainous and confused N d. mountainous but fairly regular as far as direction is concerned 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 488: A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude?
N a. 13°E Y b. 87°E N c. 177°E N d. 177°W 660: What is the length of a nautical mile?
N a. 1,850 meters N b. 5,280 feet N c. 1,760 yards Y d. 6,076 feet 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 741: What is the light phase characteristic of a lighted isolated-danger mark?
N a. Interrupted quick flashing N b. Very quick flashing N c. Long flashing Y d. Group flashing 775: A sidereal day is shorter than a solar day. This difference is due to __________.
N a. irregularities in the daily rotational rate of the Sun N b. the space motion of the solar system N c. the precession of the equinoxes Y d. the use of different reference points 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 781: The IALA Buoyage Systems do NOT apply to __________.
N a. the sides and centerlines of navigable channels N b. natural dangers and other obstructions, such as wrecks Y c. lighthouses and lightships N d. areas in which navigation may be subject to regulation 814: Steam smoke will occur when __________.
Y a. extremely cold air from shore passes over warmer water N b. warm dry air from shore passes over cooler water N c. cold ocean water evaporates into warm air N d. cool rain passes through a warm air mass 844: A cloud of marked vertical development (often anvil-shaped) would be classified as __________.
N a. cirrus N b. cirrocumulus N c. altocumulus Y d. cumulonimbus 957: The Humboldt Current flows in which direction?
Y a. North N b. South N c. East N d. West 1010: What is a characteristic of a rhumb line?
N a. It is the shortest distance between two points on the Earth. N b. It plots as a straight line on a Lambert conformal chart. Y c. It cuts each meridian at the same angle. N d. The course angle constantly changes to form the loxodromic curve. 1046: The probability of a sudden wind may be foretold by __________.
N a. a partly cloudy sky N b. an overcast sky Y c. a fast approaching line of dark clouds N d. the formation of cumulus clouds in the sky 1046: The probability of a sudden wind may be foretold by __________.
N a. a partly cloudy sky N b. an overcast sky Y c. a fast approaching line of dark clouds N d. the formation of cumulus clouds in the sky 1071: A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the __________.
Y a. north side of the mark N b. west side of the mark N c. east side of the mark N d. south side of the mark 1119: The position labeled "D" was plotted because __________. (D051NG )
N a. the vessel's speed changed at 1125 N b. a dead reckoning position is plotted within 30 minutes of a running fix Y c. a dead reckoning position is plotted for each course change N d. All of the above 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 1140: What is the light characteristic of a lighted, preferred-channel buoy?
N a. Group flashing Y b. Composite group flashing N c. Interrupted quick flashing N d. Fixed and flashing 1160: What will be the velocity of the tidal current at 0.2 mile SSW of Clason Point, NY, at 1125 on 17 April 1983?
N a. 0.5 knot N b. 0.8 knot Y c. 1.1 knots N d. 1.9 knots 1198: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a dust storm? (D042NG )
N a. I N b. H Y c. O N d. P 1201: What is NOT true concerning color sectors of lights?
Y a. Color sectors are expressed in degrees from the light toward the vessel. N b. Color sectors may indicate dangerous waters. N c. Color sectors may indicate the best water across a shoal. N d. Color sectors may indicate a turning point in a channel. 1261: A light having characteristics which include color variations is defined as __________.
N a. switching Y b. alternating N c. oscillating N d. fluctuating 1276: Which 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 1352: Weather observations provided by each weather station include all of the following except __________.
N a. temperature N b. visibility Y c. predicted weather for the next twelve hours N d. barometric pressure and change in the last three hours 1392: Cumulonimbus clouds are indicated by which number? (D039NG )
Y a. 9 N b. 7 N c. 5 N d. 3 1424: Except for N-S courses, and E-W courses on the equator, a great circle track between two points, when compared to a rhumb line track between the same two points, will __________.
N a. always be nearer to the equator Y b. always be nearer to the elevated pole N c. be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere N d. be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions 1498: A true bearing of a charted object, when plotted on a chart, will establish a __________.
N a. fix Y b. line of position N c. relative bearing N d. range 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 1739: Which condition indicates that you are in a hurricane's dangerous semicircle in the Northern hemisphere?
N a. A backing wind Y b. A veering wind N c. A norther N d. A strong, gusty wind 1884: If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?
N a. 1648 fathoms N b. 1248 fathoms N c. 1048 fathoms Y d. 824 fathoms 1908: What is the brightest navigational planet?
N a. Saturn N b. Jupiter N c. Mars Y d. Venus 1919: The nadir is the point on the celestial sphere that is __________.
N a. 90° away from the zenith N b. over Greenwich N c. on the western horizon Y d. directly below the observer 1970: The azimuth angle of a sun sight is always measured from the __________.
N a. Greenwich meridian N b. prime vertical circle Y c. principal vertical circle N d. first point of Aries 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 2119: Which stock number indicates an NGA (NIMA) chart designed for fixing positions at sea and DR plotting while on a long voyage?
Y a. WOAGN520 N b. PILOT16 N c. 16BCO16212 N d. WOPZC5245 2200: Cloud formations are minimal when the __________.
Y a. surface temperature and temperature aloft are equal N b. surface temperature and temperature aloft differ greatly N c. barometric pressure is very low N d. relative humidity is very high 2288: A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?
N a. The motion of the apparent sun is along the ecliptic. Y b. Measurement of time is along the celestial equator. N c. The speed of the Earth's revolution is not constant. N d. There are variations in the Earth's rotational speed. 2319: In low latitudes, the new Moon will always rise at about __________.
Y a. sunrise N b. 1200 LMT N c. sunset N d. 2400 LMT 2434: 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 you should lower the fore-and-aft tray. Y b. If the red ends of the magnets are forward, and the fore-and-aft tray is at the bottom, you should remove some magnets. N c. If the red ends of the magnets are to port you should raise the athwartships tray. N d. If the red ends of the magnets are to port, and the athwartships tray is at the top, you should reverse the magnets. 2572: The dividing meridian between zone descriptions -4 and -5 is __________.
N a. 60°00'E Y b. 67°30'E N c. 75°00'E N d. 60°00'W 2579: A phase correction may be applicable to correct the sextant altitude correction of __________.
N a. any star N b. the Sun N c. third magnitude stars only Y d. some planets 2664: The Light List shows a lighted aid to navigation on the right bank. This means that the light can be seen on the port side of a vessel __________.
N a. crossing the river N b. descending the river Y c. ascending the river N d. proceeding towards sea 2746: What is used to measure wind velocity?
N a. Psychrometer N b. Barometer N c. Wind sock Y d. Anemometer 3041: The letter H in illustration D006NG represents the __________.
N a. refractive horizon N b. geoidal horizon N c. celestial horizon Y d. visible horizon 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 3090: NOAA VHF weather reports are continuously broadcast on VHF channels WX-1, WX-2 and WX-3 on a frequency of __________.
N a. 156.8, 157.1, 162.55 MHz N b. 162.55, 162.00, 171.5 KHz Y c. 162.55, 162.40, 162.475 MHz N d. 2182, 2638, 2670 KHz 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 3106: What does an automatic identification system (AIS) transponder use to transmit and receive information broadcasts?
N a. 3000 Mhz and 9200 Mhz N b. 2182 Khz and 2187.5 Khz Y c. 156.525 Mhz, 161.975 Mhz and 162.025 Mhz N d. 1575.42 Mhz and 1227.6 Mhz