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.
298: A great circle crosses the equator at 173°E. It will also cross the equator at what other longitude?
Y a. 7°W N b. 73°E N c. 73°W N d. 173°W 333: Loran-C stations transmit groups of pulses at specific times. The time interval between transmissions from the master station is the __________.
N a. coding delay Y b. group repetition interval N c. pulse interval N d. phase code 419: The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the __________.
N a. abyssal plain Y b. continental shelf N c. borderland N d. offshore terrace 499: Which of the symbols shown represents an occluded front? (D018NG )
N a. A N b. B N c. C Y d. D 516: A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the following EXCEPT __________.
N a. higher than normal swells N b. high winds N c. winds veering from south, through west, to northwest Y d. gradual pressure gradient 518: With regard to GPS, a civilian receiver may be capable of achieving the same accuracy as a military receiver if __________.
Y a. selective availability is set to zero N b. the satellites are all below 15° in elevation N c. your vessel is equipped with a Doppler receiver N d. the horizontal dilution of precision is high 613: Your radar indicates a target; however, there is no visible object at the point indicated. A large mountain, approximately 50 miles away on the same bearing as the target, is breaking the horizon. You should suspect the radar target is caused by __________.
N a. a submerged submarine Y b. ducting N c. sub-refraction N d. ionospheric skip waves 620: Chart legends which indicate a conspicuous landmark are printed in __________.
Y a. capital letters N b. italics N c. boldface print N d. underlined letters 646: You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere. What action should you take to avoid the storm?
N a. Place the wind on the starboard quarter and hold that course. N b. Place the wind on the port quarter and hold that course. N c. Place the wind on the port bow and hold that course. Y d. Place the wind on the starboard bow and hold that course. 651: Which topmark shown identifies an isolated danger? (D023NG )
N a. A Y b. B N c. C N d. D 656: In the Northern Hemisphere you are caught in the dangerous semicircle with plenty of sea room available. The best course of action is to bring the wind on the __________.
Y a. starboard bow and make as much headway as possible N b. starboard quarter, and make as much headway as possible N c. port quarter, and make as much headway as possible N d. port bow, and make as much headway as possible 679: A tropical wave is usually preceded by __________.
N a. tropical storms Y b. good weather N c. heavy rain and cloudiness N d. heavy seas 708: Which statement about Radio Navigational Warning Broadcasts is TRUE?
N a. Radio navigational warnings are valid for 10 days, unless cancelled earlier. N b. NAVAREA warnings cover coastal areas only, while HYDROLANTS or HYDROPACS cover entire ocean areas. Y c. Radio navigational warnings issued by NGA (NIMA) are published in the Daily Memorandum and the Notice to Mariners. N d. HYDROLANTS and HYDROPACS cover the same geographical areas as NAVAREA warnings, but are for the use of military vessels only. 714: When using the ARPA in heavy rain, which action should you take?
N a. Increase the radar gain to pick up weak echoes through the rain. N b. Increase the STC setting to reduce close-in spurious signals. Y c. Navigate as though the effective range of the radar has been reduced. N d. Increase the range of the inner and outer guard rings. 735: The period of the Earth's revolution from perihelion to perihelion is the __________.
N a. astronomical year Y b. anomalistic year N c. solar year N d. sidereal year 793: The permanent magnetism of a vessel may change in strength due to __________.
N a. a collision with another vessel N b. being moored on a constant heading for a long period of time N c. being struck by lightning Y d. All of the above 1042: What is the approximate geographic range of Shinnecock Light, NY, if your height of eye is 24 feet (7.3 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS" .
N a. 8.7 nm N b. 9.9 nm N c. 14.4 nm Y d. 15.9 nm 1066: The slope of a warm front is about __________.
N a. 1 mile vertically to 10 miles horizontally N b. 1 mile vertically to 50 miles horizontally Y c. 1 mile vertically to 150 miles horizontally N d. 1 mile vertically to 500 miles horizontally 1138: On approaching the English Channel on course 080°T, you note the symbol YBY near a charted buoy. You must pass __________.
N a. northward of the buoy N b. southward of the buoy N c. eastward of the buoy Y d. westward of the buoy 1217: What will be the velocity and direction of the tidal current at Old Ferry Point, NY, at 1340 EST (ZD +5) on 5 February 1983?
N a. 0.8 knot at 060°T N b. 0.8 knot at 240°T N c. 1.0 knot at 076°T Y d. 1.4 knots at 076°T 1235: Weather information provided by the National Weather Service (NWS) advisories should be used along with __________.
N a. the Tide Tables and Tidal Current Tables N b. the local Notice to Mariners Y c. weather maps and local knowledge N d. any U.S. Coast Pilot 1248: On 6 July 1983, at 1520 DST (ZD +4) what will be the predicted height of tide at Newburgh, NY?
N a. 2.1 feet N b. 1.7 feet N c. 1.2 feet Y d. 0.6 foot 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 1290: In addition to the National Weather Service, what agency provides plain-language radio weather advisories for the coastal waters of the United States?
N a. National Geospatial-Intelligence Agency N b. U.S. Hydrological Survey Y c. U.S. Coast Guard N d. American Meteorological Service 1330: You are located within a stationary high pressure area. Your aneroid barometer is falling very slowly. This indicates a(n) __________.
N a. wind shift of 180° N b. large increase in wind velocity Y c. decrease in the pressure of the system N d. increase in the intensity of the system 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 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 1494: Cirrocumulus clouds are indicated by which number? (D039NG )
N a. 7 N b. 5 Y c. 3 N d. 1 1541: You are preparing a weather report form, WS Form B-80. Your position is LAT 49°35'N, LONG 162°49'E. How would this be encoded? (D041NG )
Y a. 99496, 11628 N b. 94935, 96249 N c. L4935, 16249 N d. L496N, 1628E 1653: In a weather report, the term "visibility" expresses __________.
N a. how far you can see with the "naked eye" N b. how far you can see with a telescope or binoculars N c. how well you can identify an object at night Y d. the distance in miles at which prominent objects are identifiable 1654: Which weather element cannot be measured accurately while on board a moving vessel?
Y a. Visibility N b. Temperature N c. Wind direction N d. Atmospheric pressure 1655: Yesterday your chronometer read 11h 59m 59s at the 1200 GMT time tick. Today the chronometer reads 11h 59m 57s at the 1200 time tick. What is the chronometer rate?
N a. +2s Y b. -2s N c. -3s N d. +3s 1662: Fog generally clears when the __________.
N a. wind speed increases N b. wind direction changes N c. temperature increases Y d. All of the above 1742: In the Northern hemisphere which semicircle of a hurricane is the navigable semicircle?
Y a. Left N b. Right N c. Front N d. Back 1793: Which weather element cannot be measured accurately while on board a moving vessel?
N a. relative humidity N b. temperature Y c. true wind speed N d. atmospheric pressure 1852: When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________.
Y a. 90° - Ho N b. 180° - GHA N c. GHA - LHA N d. z - d 1918: The Moon appears larger in diameter at the zenith than when near the horizon. What is this called?
N a. Parallax in altitude Y b. Augmentation N c. Horizontal parallax N d. Libration 1928: "Rotation" is the __________.
N a. wobbling of the Earth about its axis N b. motion of bodies in the solar system relative to the stars N c. motion of a celestial body in its orbit Y d. spinning of a celestial body about its axis 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 2092: Descending boats, while awaiting their turn to enter a lock, shall NOT block traffic from the lock. They shall be above the lock by at LEAST __________.
N a. 100 feet N b. 200 feet N c. 300 feet Y d. 400 feet 2125: On charts of U.S. waters, a magenta marking is NOT used for marking a __________.
N a. radio beacon N b. lighted buoy Y c. 5-fathom curve N d. prohibited area 2168: By convention, the north pole of a magnet is painted __________.
Y a. red N b. blue N c. white N d. black 2180: Relative humidity is defined as __________.
N a. the maximum vapor content the air is capable of holding N b. the minimum vapor content the air is capable of holding Y c. the ratio of the actual vapor content at the current temperature to the air's vapor holding capability N d. the relation of the moisture content of the air to barometric pressure 2184: By convention, the south seeking ends of a compass' magnets are colored __________.
Y a. blue N b. red N c. white N d. black 2301: The letter C in illustration D006NG represents the __________.
Y a. celestial horizon N b. geoidal horizon N c. visible horizon N d. sensible horizon 2414: You must construct a Mercator plotting sheet on a piece of paper measuring 20" by 28". The area includes latitude 38°S to 43°S and longitude 178°E to 175°W. 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 limitations?
N a. 2.6 inches Y b. 2.9 inches N c. 3.2 inches N d. 3.5 inches 2432: A time diagram is a diagram of the celestial sphere as observed from above the __________.
Y a. south celestial pole N b. north celestial pole N c. observer's meridian N d. Greenwich meridian 2570: A plane that cuts the Earth's surface and passes through the poles will always form __________.
N a. the equator N b. a loxodromic curve N c. a small circle Y d. a meridian 2620: The navigator is concerned with three systems of coordinates. Which system is not of major concern?
N a. Terrestrial Y b. Ecliptic N c. Celestial horizon N d. Celestial equator 2654: What is the equivalent of 5°54' in time units?
N a. 20 min. 16 sec. Y b. 23 min. 36 sec. N c. 25 min. 54 sec. N d. 30 min. 27 sec. 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 2752: A daymark used to indicate the safe water in a channel will have which of the shapes shown? (D045NG )
N a. A N b. B Y c. C N d. D 2772: The direction in which a vessel should be steered between two points is the __________.
Y a. course N b. heading N c. bearing N d. course over the ground 2792: You take a bearing of 142° and 259° of two objects. Which bearing of a third object will give the best fix?
N a. 081° N b. 238° Y c. 201° N d. 234° 2884: The pictures shown represent the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? (D011NG )
Y a. Ship No. 1 does not appear as an individual target due to the effect of beam width. N b. Small island is not detected due to the multiple echo effect from the mountain. N c. A tangent bearing of the headland to the south-southeast is corrected by subtracting one-half of the beam width. N d. Ship No. 2 is not detected due to the side lobe effect of radar reflecting from the mountain. 2975: The letter H in illustration D006NG represents the __________.
N a. geoidal horizon Y b. visible horizon N c. celestial horizon N d. refractive horizon 2978: Where do you find the semidiameter correction to be used to correct sextant observations of the stars?
N a. It is included in the altitude corrections inside the front cover of the Nautical Almanac. N b. Table 25 in Bowditch contains the correction. N c. A correction of -0.5' should be applied to all star sights. Y d. No semidiameter correction is used. 3042: How long would a steady wind need to blow in order to create a wind driven current?
N a. 2 hours N b. 6 hours Y c. 12 hours N d. 18 hours 3053: The vertical distance from the tidal datum to the level of the water is the __________.
Y a. height of tide N b. range of tide N c. actual water depth N d. charted depth 3056: A position obtained by applying ONLY your vessel's course and speed to a known position is a __________.
N a. fix Y b. dead-reckoning position N c. running fix N d. probable position