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.
43: A buoy with a composite group-flashing light indicates a(n) __________.
N a. anchorage area N b. fish net area Y c. bifurcation N d. dredging area 62: Charted depth is the __________.
N a. vertical distance from the chart sounding datum to the ocean bottom, plus the height of tide Y b. vertical distance from the chart sounding datum to the ocean bottom N c. average height of water over a specified period of time N d. average height of all low waters at a place 65: The LMT of LAN is 1210. Your longitude is 70°30'E. Which time would you use to enter the Nautical Almanac to determine the declination of the Sun at LAN?
N a. 1842 N b. 1652 Y c. 0728 N d. 0652 101: A lighted preferred-channel buoy may show a __________.
N a. fixed red light N b. Morse (A) white light Y c. composite group-flashing light N d. yellow light 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. 237: Neap tides occur when the __________.
Y a. Moon is in its first quarter and third quarter phases N b. Sun and Moon are on opposite sides of the Earth N c. Moon's declination is maximum and opposite to that of the Sun N d. Sun and Moon are in conjunction 285: The apparent wind is zero when the true wind is __________.
N a. zero N b. from ahead and equal to the ship's speed Y c. from astern and equal to the ship's speed N d. from astern and is twice the ship's speed 344: A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has __________.
N a. error of perpendicularity Y b. side error N c. prismatic error N d. centering error 391: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
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 port side of the channel N d. a wreck to be left on the vessel's starboard side 400: Information about the currents for the Pacific Coast of the U. S. are found in the __________.
N a. Ocean Current Tables N b. Nautical Almanac N c. Tide Tables Y d. Tidal Current Tables 455: The height of eye correction is smaller than geometrical dip because of __________.
N a. the angle between the horizontal and the line of sight to the visible horizon N b. index error N c. parallax Y d. terrestrial refraction 499: Which of the symbols shown represents an occluded front? (D018NG )
N a. A N b. B N c. C Y d. D 509: A line of position derived by radar range from an identified point on a coast will be a(n) __________.
N a. straight line Y b. arc N c. parabola N d. line parallel to the coast 510: Which aid is NOT marked on a chart with a magenta circle?
Y a. Aero light N b. Radar station N c. Radar transponder beacon N d. Radio beacon 521: Which sextant has an index error of 2'10" on the arc? (D050NG )
N a. A N b. B N c. C Y d. D 537: What will be the height of tide at Gargathy Neck, VA, at 1800 DST (ZD +4), on 16 August 1983?
N a. 2.3 feet Y b. 2.9 feet N c. 3.3 feet N d. 3.6 feet 563: Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. The gyro error is 1°E. Which true bearing should be plotted on the chart?
N a. 313° N b. 314° Y c. 316° N d. 317° 633: You have another ship overtaking you close aboard to starboard. You have 3 radar targets bearing 090° relative at ranges of .5 mile, 1 mile, and 1.5 miles. In this case, the unwanted echoes are called __________.
Y a. multiple echoes N b. spoking N c. indirect echoes N d. side-lobe echoes 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 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. 687: The drift and set of tidal, river, and ocean currents refer to the __________.
N a. position and area of the current Y b. speed and direction toward which the current flows N c. type and characteristic of the current's flow N d. None of the above 696: The diurnal pressure variation is most noticeable in the __________.
N a. polar regions N b. horse latitudes N c. roaring forties Y d. doldrums 804: A relative bearing is always measured from __________.
N a. true north N b. magnetic north N c. the vessel's beam Y d. the vessel's head 819: Which sextant has an index error of 4'20" off the arc? (D050NG )
Y a. A N b. B N c. C N d. D 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 835: When taking stars, those bodies to the east and west will __________.
Y a. change altitude rapidly N b. change altitude slowly N c. remain in an almost fixed position N d. appear to be moving in the plane of the horizon 878: At 0600 ZT on 31 January, your position is LAT 00°49'S, LONG 84°27'E. You are preparing a weather report form, WS Form B-80. How should you encode the first three groups after the call sign if you estimate the wind? (D041NG )
N a. 30243, 90008, 30848 N b. 31003, 99049, 38427 Y c. 31003, 99008, 30844 N d. 31063, 99049, 58427 1158: What type of cloud is indicated by the number 5 in illustration D039NG? (D039NG )
N a. Cirrostratus N b. Cirrocumulus Y c. Altocumulus N d. Nimbostratus 1196: In the Northern Hemisphere, gusty winds shifting clockwise, a rapid drop in temperature, thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies, indicate the passage of a(n) __________.
N a. warm front N b. tropical cyclone N c. anticyclone Y d. cold front 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 1251: A List of Lights entry (L Fl) is a single flashing light which shows a long flash of not less than __________.
N a. 1.0 second duration N b. 1.5 seconds duration Y c. 2.0 seconds duration N d. 3.0 seconds duration 1251: A List of Lights entry (L Fl) is a single flashing light which shows a long flash of not less than __________.
N a. 1.0 second duration N b. 1.5 seconds duration Y c. 2.0 seconds duration N d. 3.0 seconds duration 1282: Entering from sea, a daymark on the port side of the channel would be indicated on a chart by a __________.
N a. red triangle with the letter R N b. white triangle with the letters RG Y c. green square with the letter G N d. white square with the letters GR 1287: What will be the velocity of the tidal current 4.5 miles east of Smith Point, VA, at 0630 DST (ZD +4) on 6 May 1983?
Y a. 0.3 knot N b. 0.5 knot N c. 0.7 knot N d. 1.0 knot 1341: The height of a light is measured from which reference plane?
N a. Mean low water Y b. Mean high water N c. Average water level N d. Geographical sea level 1341: The height of a light is measured from which reference plane?
N a. Mean low water Y b. Mean high water N c. Average water level N d. Geographical sea level 1356: The first indications a mariner will have of the approach of a warm front will be __________.
N a. large cumulonimbus (thunderclouds) building up Y b. high cirrus clouds gradually changing to cirrostratus and then to altostratus N c. fog caused by the warm air passing over the cooler water N d. low dark clouds accompanied by intermittent rain 1362: Which type of cloud is indicated by the number 7 in illustration D039NG? (D039NG )
N a. Cirrostratus N b. Altocumulus Y c. Cumulus N d. Cumulonimbus 1406: What will act to dissipate fog?
N a. Upwelling cold water N b. Advection of warm air over a colder surface N c. Rain that is warmer than air Y d. Downslope motion of an air mass along a coast 1519: You are preparing a weather report form, WS Form B-80. Your position is LAT 10°38'S, LONG 00°14'E. How would this be encoded? (D041NG )
N a. LAT 10.6°S, LONG 00.2°E N b. L106S, 30002 N c. 10385, 0014E Y d. 99106, 30002 1631: Which picture shows an occulting light? (D034NG )
N a. A Y b. B N c. C N d. D 1657: Fog is formed when __________.
N a. the moisture in the air is condensed into small droplets N b. air is cooled to its dew point N c. the base of a cloud is on the ground Y d. All of the above 1698: When a high pressure system is centered north of your vessel in the Northern Hemisphere __________.
N a. you should experience hot, moist, clear weather Y b. the wind direction is generally easterly N c. the winds should be from the southwest at your location N d. the winds should be brisk 1760: A Doppler log in the bottom return mode indicates the __________.
N a. velocity of the current N b. bottom characteristics N c. depth of the water Y d. speed over the ground 1784: If your vessel were proceeding down river (descending), a green square marker with a green reflector border on the right bank would be a __________.
N a. mile board N b. dredging mark Y c. passing daymark N d. crossing daymark 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° 1862: What is the relative bearing of an object broad on the starboard quarter?
N a. 090° N b. 105° Y c. 135° N d. 150° 1941: IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________.
N a. red can buoy N b. red conical buoy N c. green can buoy Y d. green conical buoy 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 2342: What happens because of augmentation?
Y a. The Moon appears larger as the elevation increases. N b. The Sun appears larger when viewed against the darker background of the horizon. N c. The horizon appears elevated when observing a bright Sun or Moon at low altitudes. N d. The Moon appears larger at the full Moon. 2351: A position obtained by applying ONLY your vessel's course and speed to a known position is a __________.
N a. running fix N b. probable position N c. fix Y d. dead-reckoning position 2387: You are on a voyage from New Orleans to Boston and navigating off the Florida coast. You will get the greatest benefit from the Gulf Stream if you navigate __________.
N a. about 5 miles east of Cape Canaveral N b. about 15 miles east of Daytona N c. along the 50-fathom curve Y d. about 20 miles east of Jupiter Inlet 2396: Perihelion is the point where the Sun __________.
Y a. is nearest to the Earth N b. is farthest from the Earth N c. is on the opposite side of the Earth from the Moon N d. and Moon and Earth are in line 2478: On 23 August 1981 you observe a back sight of the lower limb of the Sun. The sextant altitude (hs) is 116°42.8'. The height of eye is 56 feet and the index error is 2.0' on the arc. What is the observed altitude (Ho)?
Y a. 63°42.0' N b. 63°38.0' N c. 63°19.4' N d. 62°49.6' 2500: When correcting the sextant altitude to apparent altitude you are correcting for inaccuracies in the reading and __________.
Y a. for inaccuracies in the reference level N b. the equivalent reading at the center of the body N c. the equivalent reading from the center of the Earth N d. the bending of the rays of light from the body 2508: Normal pool elevation is the height in feet of the section of river above a dam. This height is measured from __________.
N a. low steel on the Huey P. Long Bridge Y b. mean sea level N c. the local water table N d. the minimum dam control level 2686: The standard time meridian for description +12 is __________.
N a. 172.5°E Y b. 180.0° N c. 172.5°W N d. 165.0°W 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. 2952: The channel under a bridge is marked with lights of the lateral system. The centerline of the channel shall be marked on the bridge by __________.
Y a. an occulting white light N b. a yellow light N c. three fixed white lights N d. a flashing blue light 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°