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.
100: You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 080°T, 100 miles from your position. The hurricane is moving towards 265°T at 22 knots. What course should you steer at 12 knots to have the maximum CPA?
N a. 219° Y b. 208° N c. 199° N d. 190° 100: You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 080°T, 100 miles from your position. The hurricane is moving towards 265°T at 22 knots. What course should you steer at 12 knots to have the maximum CPA?
N a. 219° Y b. 208° N c. 199° N d. 190° 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 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 179: You are proceeding up a channel at night. It is marked by a range which bears 185°T. You steady up on a compass course of 180° with the range in line dead ahead. This indicates that you(r) __________.
N a. must come right to get on the range N b. course is in error Y c. compass has some easterly error N d. are being affected by a southerly current 218: Lines of position may be __________.
N a. hyperbolas N b. straight lines N c. arcs Y d. All of the above 229: The shoreline on charts generally represents the mean __________.
Y a. high water line N b. low water line N c. low water spring line N d. tide level 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 362: Which statement about a simple conic chart projection is TRUE?
N a. It is an equal-area projection. N b. It is a conformal projection. N c. Meridians appear as curved lines. Y d. The scale is correct along any meridian. 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 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. 478: The velocity of the apparent wind can be more than the true wind, and come from the same direction, if certain conditions are present. One condition is that the __________.
N a. ship's speed must be less than the true wind velocity N b. true wind must be from dead astern N c. true wind velocity must be faster than the ship's speed Y d. true wind must be from dead ahead 486: Tropical cyclones do not form within 5° of the Equator because __________.
N a. there are no fronts in that area N b. it is too hot N c. it is too humid Y d. of negligible Coriolis force 514: What instrument measures wind velocity?
N a. Hydrometer N b. Barometer N c. Psychrometer Y d. Anemometer 535: The tropical year differs from which year by 20 minutes?
N a. Astronomical year N b. Natural year N c. Equinoctial year Y d. Sidereal year 541: A yellow buoy may mark a(n) __________.
N a. wreck N b. shoal area Y c. anchorage area N d. middle ground 549: On a working copy of a weather map, an occluded front is represented by which color line?
N a. Red N b. Blue N c. Alternating red and blue Y d. Purple 553: The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?
N a. 052° N b. 056° Y c. 059° N d. 060° 600: The dangerous semicircle of a typhoon in the Southern Hemisphere is that area __________.
N a. measured from due south clockwise 180° N b. measured from due south counterclockwise 180° Y c. to the left of the storm's track N d. ahead of the typhoon measured from the storm's track to 90° on each side 602: Between the equator and the 46th parallel of latitude, there are 3099 meridional parts. How many degrees of equatorial longitude does 3099 meridional parts represent?
N a. 35°52'45" Y b. 51°39'00" N c. 74°21'11" N d. 82°36'12" 609: A tropical wave is located 200 miles due west of your position, which is north of the equator. Where will the wave be in 24 hours?
Y a. Farther away to the west N b. Farther away to the east N c. In the same place N d. Closer and to the west 617: You are bound for the Chelsea docks in the Hudson River. The Captain wants to arrive at the docks at the first slack water on 28 July 1983. You are keeping daylight saving time. What time should you be at the docks?
Y a. 0215 N b. 0530 N c. 0811 N d. 0911 626: What indicates the arrival of a hurricane within 24 to 36 hours?
N a. The normal swell becoming lower and from a steady direction N b. Long bands of nimbostratus clouds radiating from a point over the horizon N c. The barometer drops 2 millibars between 1000 and 1600 Y d. Unusually good weather with above average pressures followed by a slow fall of 4 millibars in six hours 677: A swift current occurring in a narrow passage connecting two large bodies of water, which is produced by the continuously changing difference in height of tide at the two ends of the passage, is called a __________.
Y a. hydraulic current N b. rectilinear current N c. rotary current N d. harmonic current 680: The apparent wind's speed can be zero, but only when two conditions are present. One condition is that the true __________.
N a. wind must be on the beam N b. wind's speed must be zero N c. wind must be from dead ahead Y d. wind's speed equals the ship's speed 724: Which statement concerning GPS is TRUE?
N a. It cannot be used in all parts of the world. N b. There are 12 functioning GPS satellites at present. Y c. It may be suspended without warning. N d. Two position lines are used to give a 2D fix. 747: The movement of water away from the shore or downstream is called a(n) __________.
N a. reversing current Y b. ebb current N c. flood current N d. slack current 795: The path of a celestial body during its daily apparent revolution around the Earth is called its __________.
N a. ecliptic Y b. diurnal circle N c. altitude circle N d. circle of position 813: At the magnetic equator there is no induced magnetism in the vertical soft iron because __________.
N a. the lines of force cross the equator on a 0°-180° alignment N b. the quadrantal error is 0° Y c. there is no vertical component of the Earth's magnetic field N d. the intercardinal headings have less than 1° error 849: The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 30 feet (9.1 meters) and the visibility is 0.5 mile. At what approximate range will you first sight the light?
N a. 0.5 mile Y b. 1.4 miles N c. 5.2 miles N d. 12.0 miles 913: How many points are there in a compass card?
N a. 4 N b. 8 N c. 24 Y d. 32 935: The Light List shows that a navigational light has a nominal range of 5 miles and a height above water of 21 feet (6.4 meters). Your height of eye is 32 feet (9.8 meters) and the visibility is 1.0 mile. At what approximate range will you first sight the light?
N a. 1.0 mile Y b. 1.5 miles N c. 5.0 miles N d. 11.7 miles 970: You are preparing a weather report form, WS Form B-80. The sky is overcast, and the anemometer indicates that the apparent wind is from 144° relative at 8 knots. You are on course 162°T at 15 knots. How should you encode group Nddff? (D041NG )
N a. 91521 Y b. 83322 N c. 81408 N d. 01615 1015: Which statement about the time diagram shown is correct? (D005NG )
N a. The Greenwich hour angle of the Sun is greater than 180°. N b. The meridian angle of the Sun is labeled west. N c. The date of Greenwich is the day after the date for observer at M. Y d. The Sun has already passed the lower branch of the observer's meridian. 1114: Mechanical lifting of air by the upslope slant of the terrain is called __________.
N a. vertical lifting N b. convective lifting N c. advective lifting Y d. topographic lifting 1216: In the Northern Hemisphere, winds veering sharply to the west or northwest with increasing speed are indications that a __________.
Y a. cold front has passed N b. low pressure center is approaching N c. stationary front exists N d. high pressure center has passed 1357: You will transit the Cape Cod Canal on 7 November 1983. If you arrive at the R R Bridge at 1655 EST (ZD +5), for what period of time during your transit will you have currents of not more than 0.5 knot?
N a. 1631 to 1719 N b. 1638 to 1655 Y c. 1648 to 1702 N d. 1655 to 1709 1649: If you count 20 seconds between seeing lightning and hearing the thunder, how far is the storm away from you?
N a. 2 miles Y b. 4 miles N c. 6 miles N d. 8 miles 1656: Which instrument is most useful in forecasting fog?
N a. A barometer N b. An anemometer Y c. A sling psychrometer N d. A pyrometer 1676: Lighted information markers show __________.
N a. green lights Y b. white lights N c. yellow lights N d. red lights 1774: Restricted areas at locks and dams are indicated by __________.
N a. flashing red lights upstream and fixed red lights downstream N b. yellow unlighted buoys Y c. signs and/or flashing red lights N d. red daymarks upstream and green daymarks downstream 1782: You are on course 027°T and take a relative bearing to a lighthouse of 220°. What is the true bearing to the lighthouse?
N a. 113° N b. 193° Y c. 247° N d. 279° 1831: IN REGION A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a __________.
N a. red conical buoy N b. black can buoy Y c. red can buoy N d. black conical buoy 1838: The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel __________.
Y a. ascending the river N b. descending the river N c. crossing the river N d. proceeding towards sea 1879: A chart projection depicting the poles and a small area on either side of a connecting meridian, that is sometimes used for star charts, is the __________.
N a. azimuthal gnomonic projection N b. Lambert conformal projection Y c. transverse Mercator projection N d. polyconic projection 1955: The letter A in illustration D006NG represents the __________.
N a. geoidal horizon Y b. sensible horizon N c. celestial horizon N d. visible horizon 2030: A vessel heading NE is on a course of __________.
N a. 022.5° Y b. 045.0° N c. 067.5° N d. 090.0° 2054: The diagram is of a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter B? (D038NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No lights 2182: 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, what light(s) will be shown at D if the lock walls and piers are not awash?
N a. No lights Y b. One red light N c. Two red lights N d. Three red lights 2336: The period of revolution of the Moon is __________.
N a. 24 hours Y b. about 27.3 days N c. 365 days N d. about 19 years 2439: Which statement about the time diagram in illustration D008NG is TRUE? (D008NG )
Y a. You are in east longitude. N b. The Sun is setting for you. N c. Your date is different from the Greenwich date. N d. The GHA is approximately 160°. 2528: Illustration D038NG represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter A in the illustration? (D038NG )
N a. One red light N b. Two red lights N c. Two green lights Y d. No light 2628: A drawbridge may use visual signals to acknowledge a vessel's request to open the draw. Which signal indicates that the draw will NOT be opened immediately?
N a. A flashing amber light Y b. A fixed red light N c. A white flag raised and lowered vertically N d. A flashing white light 2750: When pushing a tow and approaching barges tied off to the shore, you should __________.
N a. increase speed so you will pass faster Y b. decrease speed while passing so you won't create a suction N c. do nothing different as the barges should be tied off properly N d. move to the opposite side of the channel from the barges and increase speed 2822: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 2 seconds after the signal was sounded. What is the distance to the shore?
Y a. 360 yards N b. 320 yards N c. 280 yards N d. 140 yards 2876: On 13 November 1981 you observe a back sight of the lower limb of the Sun. The sextant altitude (hs) is 109°23.6'. The height of eye is 66 feet, and the index error is 2.0' off the arc. What is the observed altitude (Ho)?
N a. 71°01.2' Y b. 70°57.2' N c. 70°45.4 N d. 70°26.4' 2889: On 29 June 1981 you observe a back sight of the upper limb of the Moon. The sextant altitude (hs) is 114°16.9'. The height of eye is 36 feet, and the index error is 2.0' off the arc. The horizontal parallax is 60.5'. What is the observed altitude (Ho)?
N a. 66°23.8' N b. 66°04.4' N c. 66°00.4' Y d. 65°53.8' 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 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° 3025: You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________.
Y a. estimated position N b. dead-reckoning position N c. fix N d. running fix