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.
72: The datum from which the predicted heights of tides are reckoned in the tide tables is __________.
N a. mean low water Y b. the same as that used for the charts of the locality N c. the highest possible level N d. given in table three of the tide tables 113: The type of transmission used in Loran-C is a __________.
N a. single pulse N b. wide pulse Y c. multipulse N d. narrow pulse 193: In using Loran-C, skywave reception gives greater range but is __________.
N a. only accurate during daylight hours Y b. much less accurate N c. only accurate at twilight N d. more accurate than using ground waves 272: What does the symbol shown indicate on a chart? (D033NG )
N a. A sunken vessel marked by a buoy Y b. A safe water beacon N c. A red and white can buoy N d. A can buoy with a rotating white light 319: The Illustration shows the symbols used by radio facsimile weather charts. The symbol indicated at letter "F" represents a __________. (D042NG )
N a. maritime air mass Y b. weather boundary N c. convergence zone N d. squall line 384: Which is a nonadjustable error of the sextant?
N a. Error of perpendicularity N b. Side error N c. Error of collimation Y d. Centering error 404: An aneroid barometer is an instrument __________.
N a. used to measure the speed of wind Y b. in which the pressure of the air is measured N c. that tells which direction a storm is coming from N d. used to measure the height of waves 578: At about GMT 1436, on 3 December 1981, the lower limb of the Moon is observed with a sextant having an index error of 2.5' on the arc. The height of eye is 32 feet. The sextant altitude (hs) is 3°38.8'. What is the observed altitude?
N a. Ho 4°18.6' Y b. Ho 4°29.1' N c. Ho 4°36.3' N d. Ho 4°42.2' 625: The center of a circle of equal altitude, plotted on the surface of the Earth, is the __________.
N a. dead reckoning position of the observer N b. assumed position of the observer Y c. geographical position of the body N d. assumed position of the body 631: A light characteristic of composite group flashing indicates that there is a(n) __________.
N a. sharp turn in the channel N b. narrowing in the channel at that point Y c. junction in the channel N d. obstruction that must be left to port 648: Weather systems in the middle latitudes generally travel from __________.
N a. north to south Y b. west to east N c. east to west N d. None of the above 716: Standard atmospheric pressure in inches of mercury is __________.
N a. 30.00 N b. 28.92 Y c. 29.92 N d. 29.00 779: 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 896: The wind direction around a low pressure area in the Northern Hemisphere is __________.
N a. clockwise and inward N b. clockwise and outward Y c. counterclockwise and inward N d. counterclockwise and outward 919: You are plotting a running fix in an area where there is a determinable current. How should this current be treated in determining the position?
N a. The drift should be added to the ship's speed. Y b. The course and speed made good should be determined and used to advance the LOP. N c. The current should be ignored. N d. The set should be applied to the second bearing. 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 990: You plot a fix using three lines of position and find they intersect in a triangle. You should plot the position of the vessel __________.
N a. outside of the triangle N b. anywhere in the triangle N c. on the line of position from the nearest object, between the other two lines of position Y d. in the geometric center of the triangle 1073: Chart legends printed in capital letters show that the associated landmark is __________.
N a. inconspicuous N b. a radio transmitter Y c. conspicuous N d. a government facility or station 1088: Which statement about an estimated position is TRUE?
N a. It is more reliable than a fix based on radar bearings. Y b. It may be based on a single LOP or questionable data. N c. When a 3-LOP fix plots in a triangle, the center of the triangle is the estimated position. N d. It is usually based on soundings. 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 1185: An orange and white buoy with a rectangle on it displays __________.
N a. directions N b. distances N c. locations Y d. All of the above 1207: What will be the velocity of the tidal current at New London Harbor Entrance, CT, at 1615 EST (ZD +5) on 26 December 1983?
Y a. 0.2 knot N b. 0.4 knot N c. 0.7 knot N d. 0.9 knot 1211: Red sectors of navigation lights warn mariners of __________.
N a. floating debris N b. heavily trafficked areas N c. recently sunken vessels Y d. shoals or nearby land 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 1267: What will be the velocity of the tidal current at Coxsackie, NY, at 0945 EST (ZD +5) on 11 March 1983?
N a. 0.3 knot Y b. 0.7 knot N c. 1.2 knots N d. 1.9 knots 1345: A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol in illustration D015NG?
N a. D N b. C Y c. B N d. A 1372: You are enroute to Jacksonville, FL, from San Juan, P.R. There is a fresh N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.
N a. cirrus clouds N b. long swells N c. smoother seas and warmer water Y d. steeper waves, closer together 1392: Cumulonimbus clouds are indicated by which number? (D039NG )
Y a. 9 N b. 7 N c. 5 N d. 3 1489: Cumulonimbus clouds can produce __________.
N a. dense fog and high humidity Y b. gusty winds, thunder, rain or hail, and lightning N c. clear skies with the approach of a cold front N d. a rapid drop in barometric pressure followed by darkness 1628: As the temperature of the air reaches the dew point, __________.
N a. rain must develop Y b. fog may form N c. it begins to snow N d. water freezes 1667: Air masses near the earth's surface __________.
N a. move from areas of high pressure to areas of low pressure N b. are deflected by the earth's rotation in both hemispheres N c. are deflected by the "Coriolis effect" Y d. All of the above 1722: Hurricanes may move in any direction. However, it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the __________.
N a. west or northwest N b. northeast Y c. southeast N d. north 1754: The dumping of refuse in a lock is permitted __________.
N a. when approved by the lockmaster N b. when locking downbound Y c. at no time N d. during high water only 1850: A vessel heading WNW is on a course of __________.
N a. 270.0° Y b. 292.5° N c. 315.0° N d. 337.5° 1872: To find a magnetic compass course from a true course you must apply __________.
N a. deviation N b. variation Y c. deviation and variation N d. magnetic anomalies (local disturbances) 1920: Because the actual center of some planets may differ from the observed center, the navigator applies a correction known as the __________.
Y a. phase correction N b. refraction correction N c. semidiameter correction N d. augmentation correction 1988: The parallel of latitude at 23°27'N is the __________.
Y a. Tropic of Cancer N b. Tropic of Capricorn N c. Arctic Circle N d. ecliptic 2014: Which stock number indicates an NGA (NIMA) chart designed for navigation outside of outlying reefs and shoals?
N a. 19BCO19243 Y b. WOPGN530 N c. LCORR5873 N d. 14XCO14902 2093: Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained from the __________.
N a. Light List Vol. V N b. List of Lights Y c. Broadcast Notice to Mariners N d. Sailing Directions 2160: Information for updating nautical charts is primarily found in the __________.
Y a. Notice to Mariners N b. Coast Pilots N c. nautical chart catalogs N d. Sailing Directions 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 2199: Denebola is found in what constellation?
N a. Hydrus Y b. Leo N c. Centaurus N d. Aquila 2230: A nautical mile is a distance of approximately how much greater than or less than a statute mile?
N a. 1/4 less N b. 1/7 less N c. 1/4 greater Y d. 1/7 greater 2259: 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?
N a. If the quadrantal spheres are out as far as possible replace them with smaller spheres. N b. If the quadrantal spheres are in as far as possible remove one of the spheres. N c. If the quadrantal spheres are in as far as possible replace them with smaller spheres. Y d. If the quadrantal spheres are out as far as possible, move the quadrantal spheres in. 2304: The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?
N a. Libration in longitude N b. Diurnal libration Y c. Vertical libration N d. Libration in latitude 2349: The summer solstice is the point where the Sun is at __________.
Y a. maximum declination north N b. maximum declination south N c. 0° declination going to northerly declinations N d. 0° declination going to southerly declinations 2379: The winter solstice is the point where the Sun is at __________.
N a. maximum declination north Y b. maximum declination south N c. 0° declination going to northerly declinations N d. 0° declination going to southerly declinations 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° 2504: Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which topmark shown? (D046NG )
N a. A N b. B Y c. C N d. D 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 2624: You must construct a Mercator plotting sheet on a piece of paper measuring 30" by 32". The area includes latitudes 31°10'S to 37°40'S and longitudes 007°00'W to 001°00'E. Allow a one-half inch neat line on all sides. What is the maximum distance between each degree of longitude that will permit the area of the plotting sheet to be drawn within the stated limitation?
Y a. 3.69 inches N b. 3.52 inches N c. 3.38 inches N d. 3.26 inches 2651: Low pressure disturbances which travel along the intertropical convergence zone are called __________.
Y a. tropical waves N b. tropical disturbances N c. permanent waves N d. tidal waves 2680: The angle measured eastward from the vernal equinox along the celestial equator often expressed in time units is the __________.
N a. Greenwich sidereal time Y b. right ascension N c. local sidereal time N d. sidereal hour angle 2700: In the horizon system of coordinates what is equivalent to the meridian angle of the celestial equator system?
Y a. Azimuth angle N b. Zenith distance N c. Colatitude N d. Altitude 2704: The Light List shows a lighted aid to navigation on the right bank. This means that the light can be seen on the starboard side of a vessel __________.
N a. proceeding from seaward N b. crossing the river N c. ascending the river Y d. descending the river 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 3002: The diurnal variation of pressure is most noticeable __________.
N a. above the polar circles N b. in a low pressure area N c. during periods of low temperatures Y d. in the doldrums 3018: You take a bearing of 356° of a lighthouse. Which bearing of another object would give the best fix?
N a. 013° N b. 178° Y c. 256° N d. 342° 3030: Isogonic lines are lines on a chart indicating __________.
Y a. points of equal variation N b. points of zero variation N c. the magnetic latitude N d. magnetic dip 3127: Which of the following statements is TRUE regarding automatic identification systems (AIS) ?
N a. AIS cannot be used to make passing arrangements because the system is not capable of this type of ship-to-ship communications. N b. AIS cannot be used to make passing arrangements because the ship-to-ship text messaging feature is for emergency use only. Y c. AIS can be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is not relieved from the requirement to sound whistle signals or make arrangements via bridge-to-bridge radiotelephone. N d. AIS can be used to make passing arrangements via ship-to-ship text massaging thus relieving a vessel operator from making such arrangements via bridge-to-bridge radiotelephone or signaling intent to pass via whistle signals.