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.
20: You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 120°T, 110 miles from your position. The hurricane is moving towards 285°T at 25 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?
Y a. 77 miles N b. 82 miles N c. 87 miles N d. 93 miles 51: In the U.S. Aids to Navigation System, red and green horizontally-banded buoys mark __________.
N a. channels for shallow draft vessels N b. general anchorage areas N c. fishing grounds Y d. junctions or bifurcations 59: For navigational purposes, each great circle on the Earth has a length of __________.
N a. 3,600 miles N b. 5,400 miles N c. 12,500 miles Y d. 21,600 miles 78: A single line of position combined with a dead-reckoning position results in a(n) __________.
N a. assumed position Y b. estimated position N c. fix N d. running fix 198: You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 343°T at 92 miles from you. What is the time to intercept if you make 9 knots?
N a. 7h 44m N b. 7h 12m Y c. 6h 43m N d. 6h 08m 230: If the LORAN-C ground wave does NOT extend out as far as the skywave skip distance, there will be a skip zone in which __________.
Y a. no LORAN-C signal is received N b. only ground waves are received N c. only skywaves are received N d. both ground waves and skywaves are received 252: A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol? (D015NG )
N a. A Y b. B N c. C N d. D 351: Which buoy may be odd numbered?
N a. A spherical buoy Y b. An unlighted can buoy N c. A red buoy N d. A yellow buoy 367: What will be the time after 0800 EST (ZD +5) that the height of the tide at South Freeport, ME, will be 6.0 feet (1.8 meters) on 7 November 1983?
N a. 0936 N b. 0942 Y c. 0951 N d. 1001 408: A buoy bears 176°T at 3000 yards. What is the course to make good to leave the buoy 100 yards to port?
N a. 174°T N b. 176°T Y c. 178°T N d. 180°T 429: A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude?
N a. 127°E Y b. 53°E N c. 27°E N d. 27°W 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. 484: The needle of an aneroid barometer points to 30.05 on the dial. This indicates that the barometric pressure is __________.
Y a. 30.05 inches of mercury N b. 30.05 millimeters of mercury N c. 30.05 millibars N d. falling 706: A steep barometric gradient indicates __________.
N a. calms N b. light winds Y c. strong winds N d. precipitation 772: You are hove to in a hurricane on a heading of 328°T. The wind is from 030° true at 119 knots. How should this be encoded on the weather report form under Nddff. (D041NG )
N a. 80312 N b. 83011 N c. 83099 Y d. 80399 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 818: Ocean swells originating from a typhoon can move ahead of it at speeds near __________.
N a. 10 knots N b. 20 knots N c. 30 knots Y d. 50 knots 872: Which agency publishes the Light Lists?
Y a. United States Coast Guard N b. National Ocean Service N c. Oceanographic Office N d. Army Corps of Engineers 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 892: When a buoy is in position only during a certain period of the year, where may the dates when the buoy is in position be found?
Y a. Light List N b. Notice to Mariners N c. On the chart N d. Coast Pilot 915: The Sun's center may be coincident with both the celestial equator and the observer's prime vertical circle when __________.
N a. it crosses the December solstitial point N b. it crosses the June solstitial point N c. it is in upper transit Y d. its declination is zero 968: The world is divided into NAVAREAS for the dissemination of important marine information. Which NAVAREAS include the U.S. coasts?
N a. I and II Y b. IV and XII N c. V and X N d. VI and VII 1170: Which statement concerning the illustration is correct? (Soundings and heights are in meters) (D010NG )
N a. Maury Lightship swings about her anchor on a circle with a 21-meter diameter. Y b. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. N c. There is a 12-meter deep hole inside the 5-meter curve just west of Beito Island. N d. The position of the lightship is indicated by the center of the star on the symbol's mast. 1255: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. extension of the low pressure ridge N b. direction of circulation and pressure gradient N c. recurvature effect Y d. the wind circulation and forward motion of the storm 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 1277: The velocity and direction of the tidal current at Port Morris, NY, at 1135 DST (ZD +4) on 13 May 1983 will be __________.
Y a. negligible at 220°T N b. 3.1 knots at 045°T N c. 1.2 knots at 220°T N d. 1.0 knot at 045°T 1285: You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 248°T at 64 miles from you. What is the time to intercept if you make 13 knots?
N a. 4h 55m N b. 4h 36m N c. 3h 59m Y d. 3h 44m 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 1318: You are to sail from Elizabethport, N.J., on 17 November 1983 with a maximum draft of 27 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 25.5 feet. The steaming time from Elizabethport to the obstruction is 1h 50m. What is the earliest time (ZD +5) you can sail on 17 November and pass over the obstruction with 2 feet of clearance?
N a. 0059 Y b. 0121 N c. 0159 N d. 0221 1348: Vessel required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
Y a. speed of the vessel over the ground or through the water N b. distance to the next port N c. time of the next navigational satellite pass N d. None of the above 1350: You are running parallel to the coast and plotting running fixes using bearings of the same object. You are making more speed than assumed for the running fix. In relation to the position indicated by the fix you will be __________.
N a. closer to the coast Y b. farther from the coast N c. on the track line ahead of the fix N d. on the track line behind the fix 1367: You want to transit Hell Gate, NY on 23 July 1983. What is the period of time around the AM (ZD +4) slack before ebb when the current will be less than 0.3 knot?
N a. 0939 to 0957 Y b. 0943 to 0953 N c. 0844 to 0852 N d. 0348 to 0356 1379: The lubber's line on a magnetic compass indicates __________.
N a. compass north Y b. the direction of the vessel's head N c. magnetic north N d. a relative bearing taken with an azimuth circle 1383: The spin axis of a gyroscope tends to remain fixed in space in the direction in which it is started. How does this gyroscope become north seeking so that it can be used as a compass?
Y a. By mechanically or electrically applying forces to precess the gyroscope N b. By starting the compass with the spin axis in a north/south position N c. By taking advantage of the property of gyroscopic inertia N d. The rotation of the Earth (Earth rate) automatically aligns the gyroscope with north, except for speed errors 1408: An occluded front is caused by a(n) __________.
N a. low pressure area N b. high pressure area N c. area of calm air Y d. cold front overtaking a warm front 1463: If the gyrocompass error is east, what describes the error and the correction to be made to gyrocompass headings to obtain true headings?
Y a. The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true N b. The readings are too low and the amount of the error must be subtracted from the compass to obtain true N c. The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true N d. The readings are too high and the amount of the error must be subtracted from the compass to obtain true 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 1511: When within 300 miles of a named tropical storm or hurricane, it is standard practice to send weather reports every __________.
N a. 8 hours N b. 6 hours Y c. 3 hours N d. hour 1675: You are entering port and have been instructed to anchor, as your berth is not yet available. You are on a SW'ly heading, preparing to drop anchor, when you observe the range lights as shown on your starboard beam. You should __________. (D047NG )
N a. NOT drop the anchor until the lights are in line Y b. ensure your ship will NOT block the channel or obstruct the range while at anchor N c. drop the anchor immediately as the range lights mark an area free of obstructions N d. drop the anchor immediately as a change in the position of the range lights will always be an indication of dragging anchor 1743: In the Northern Hemisphere, if your vessel is in a hurricane's navigable semicircle it should be positioned with the wind on the __________.
Y a. starboard quarter, hold course and make as much speed as possible N b. port bow, hold course and make as much speed as possible until the hurricane has passed N c. port quarter, maintain course and make as much speed as possible N d. starboard bow and heave to until the hurricane has passed 1787: What indicates that a tropical cyclone may be within 500 to 1,000 miles of your position?
Y a. A pumping of the barometer up and down a few millibars N b. A sudden wind shift from southwest to northwest followed by steadily increasing winds N c. The normal swell pattern becoming confused, with the length of the swell increasing N d. An overcast sky with steadily increasing rain from nimbostratus clouds 1859: While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers this is a __________.
N a. special purpose signal N b. passing daymark Y c. crossing daymark N d. cable crossing 1944: In the horizon system of coordinates what is the equivalent to the celestial equator of the celestial equator system?
Y a. Horizon N b. Prime vertical circle N c. Prime meridian N d. Principal vertical circle 1996: When approaching a lock entrance, the visual signal displayed when a single lock is ready for entrance is a flashing __________.
N a. red light Y b. green light N c. amber light N d. white light 2124: You must draw a plotting sheet covering latitudes 45°N to 49°N and longitudes 179°E to 178°W. If the distance between latitude 45°N to 49°N is 20 inches, what is the distance between the meridians of 1° of longitude?
N a. 2.9 inches N b. 3.2 inches Y c. 3.4 inches N d. 3.7 inches 2131: The white lights in a vertical line on a multiple-span bridge indicate __________.
Y a. the main channel N b. the draw span is inoperable N c. the river is obstructed under that span N d. scaffolding under the span is reducing the vertical clearance 2183: 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. Three red lights N b. Two red lights Y c. One red light N d. No light 2266: It is difficult to determine which limb of the Moon is fully illuminated __________.
N a. when the Moon is low in the sky at rising or setting N b. at the new Moon phase N c. when taking Moon sights during daylight Y d. when the terminator is nearly vertical 2294: What celestial body may sometimes be observed in daylight?
N a. New Moon N b. Saturn N c. Sirius Y d. Venus 2320: The type of current which will have the greatest effect on the course made good for your vessel is __________.
N a. one flowing in the same direction as your course steered N b. one flowing in the opposite direction as your course steered Y c. one that flows at nearly right angles to your course steered N d. a rotary current in which the direction of current flow constantly changes 2373: The vertical distance from the tidal datum to the level of the water is the __________.
N a. actual water depth N b. range of tide N c. charted depth Y d. height of tide 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 2409: You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?
N a. Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach N b. Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges N c. Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. Y d. Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. 2530: The distance between any two meridians measured along a parallel of latitude __________.
N a. increases in north latitude and decreases in south latitude N b. decreases as DLO increases N c. increases with increased latitude Y d. decreases with increased latitude 2675: When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________.
N a. come left Y b. continue on the present course N c. come right N d. wait until the lights are no longer in a vertical line 2712: A bold reef is a reef __________.
N a. with part of it extending above the water Y b. that can be detected by water turbulence N c. that drops off sharply N d. perpendicular to the current 2730: When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind, the approach is best made __________.
Y a. with bow out, stern in N b. with bow in, stern out N c. parallel to the dock, as close in as possible N d. parallel to the dock, as far out as possible 2782: Your radar is set on a true motion display. Which of the following will appear to move across the PPI scope.
Y a. Own ship's marker N b. Echo from a ship at anchor N c. Echoes from land masses N d. All of the above 2902: The direction a vessel is pointed at any given time is the __________.
N a. course N b. track Y c. heading N d. course over the ground 2986: Some places maintain a zone time of -13. What are the time and date at Greenwich if the zone time and date are 2152, 10 January?
N a. 1052, 9 January Y b. 0852, 10 January N c. 1052, 10 January N d. 1052, 11 January