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.
67: What is the definition of height of tide?
Y a. The vertical distance from the tidal datum to the level of the water at any time N b. The vertical difference between the heights of low and high water N c. The vertical difference between a datum plane and the ocean bottom N d. The vertical distance from the surface of the water to the ocean floor 216: The prevailing winds in the band of latitude from approximately 5°N to 30°N are the __________.
N a. prevailing westerlies Y b. northeast trade winds N c. southeast trade winds N d. doldrums 222: 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. N b. The position of the lightship is indicated by the center of the star on the symbol's mast. N c. There is a 12 meter deep hole inside the 5-meter curve just west of Beito Island. Y d. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. 256: The belt of light and variable winds between the westerly wind belt and the northeast trade winds is called the __________.
Y a. subtropical high pressure belt N b. intertropical convergence zone N c. doldrum belt N d. polar frontal zone 293: The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of __________.
N a. high frequency pulses N b. combinations of high and low frequency pulses Y c. the same frequency for all stations in a chain N d. varied long and short pulses 479: You are enroute to assist vessel A. Vessel A is underway at 5 knots on course 063°T, and bears 136°T at 78 miles from you. What is the course to steer at 13 knots to intercept vessel A?
Y a. 114° N b. 158° N c. 295° N d. 340° 586: The approximate distance to a storm center can be determined by noting the hourly rate of fall of the barometer. If the rate of fall is 0.08 - 0.12 inches, what is the approximate distance to the storm center?
N a. 50 to 80 miles Y b. 80 to 100 miles N c. 100 to 150 miles N d. 150 to 250 miles 624: When using a mechanical (windup type) marine chronometer, how often should it be reset?
Y a. Only when it is overhauled N b. Whenever the chronometer error exceeds approximately four minutes N c. At the start of each voyage N d. If the chronometer rate changes from gaining to losing or vice versa 664: Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel?
N a. Set and drift of the current Y b. Relative track information N c. Predicted time of CPA N d. Initial range of acquisition 671: You sight a buoy fitted with a double-sphere topmark. If sighted at night, this buoy would show a __________.
N a. quick-flashing red light N b. quick-flashing green light Y c. flashing white light showing a group of two flashes N d. flashing red light showing a group of three flashes 688: In mid-ocean, the characteristics of a wave are determined by three factors. What is NOT one of these factors?
Y a. Effect of the moon's gravity N b. Fetch N c. Wind velocity N d. Length of time a wind has been blowing 744: A hand held instrument used to measure distances between objects and the ship is a __________.
N a. vernier N b. psychrometer N c. hygrometer Y d. stadimeter 762: Chart correction information is NOT disseminated through the __________.
N a. Summary of Corrections N b. Local Notice to Mariners N c. Daily Memorandum Y d. Chart Correction Card 773: What is the basic principle of the magnetic compass?
Y a. Magnetic materials of the same polarity repel each other and those of opposite polarity attract. N b. The Earth's magnetic lines of force are parallel to the surface of the Earth. N c. Magnetic meridians connect points of equal magnetic variation. N d. The compass needle(s) will, when properly compensated, lie parallel to the isogonic lines of the Earth. 803: Which buoy will NOT display white retroreflective material?
N a. Safe water mark N b. Isolated danger mark Y c. Preferred channel mark N d. Daymark of no lateral significance 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 853: The standard magnetic compass heading differs from the true heading by __________.
Y a. compass error N b. latitude N c. variation N d. deviation 891: Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have __________.
N a. an even number N b. an odd number N c. a pillar shape Y d. horizontal bands 939: That half of the hurricane to the right hand side of its track (as you face the same direction that the storm is moving) in the Northern Hemisphere is called the __________.
N a. windward side N b. leeward side N c. safe semicircle Y d. dangerous semicircle 957: The Humboldt Current flows in which direction?
Y a. North N b. South N c. East N d. West 993: When crossing the magnetic equator the __________.
N a. Flinders bar should be inverted Y b. heeling magnet should be inverted N c. the quadrantal spheres should be rotated 180° N d. Flinders bar should be moved to the opposite side of the binnacle 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 1049: At 0000 you fix your position and change course to 270°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE?
N a. The set is 090°, drift 0.5 knot. Y b. The set is 090°, drift 1.0 knot. N c. The set is 270°, drift 0.5 knot. N d. The set is 270°, drift 1.0 knot. 1108: Preferred channel buoys indicate the preferred channel to transit by __________.
N a. odd or even numbers Y b. the color of their top band N c. the location of the buoy in the channel junction N d. the buoy's light rhythms 1189: Concerning a celestial observation, the azimuth angle is measured from the principal vertical circle to the ____________ .
N a. Greenwich celestial meridian N b. hour circle of the body N c. local celestial meridian Y d. vertical circle of the body 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 1278: The difference between the heights of low and high tide is the __________.
N a. depth N b. distance Y c. range N d. period 1434: What is NOT a characteristic of cardinal marks?
N a. Yellow and black bands N b. White lights Y c. Square or triangular topmarks N d. Directional orientation to a hazard 1480: What is the definition of height of tide?
N a. The vertical difference between the heights of low and high water N b. The vertical difference between a datum plane and the ocean bottom N c. The vertical distance from the surface of the water to the ocean floor Y d. The vertical distance from the tidal datum to the level of the water at any time 1539: You are steaming in the open ocean of the North Pacific between the Aleutian Chain and Hawaii. A warning broadcast indicates that an earthquake has occurred in the Aleutians and has generated a tsunami that is predicted to hit Hawaii. What action is necessary for the ship's safety?
N a. Calculate the tsunami's ETA at your position and turn to a course that will head into the Tsunami. N b. Securely stow all loose gear, check deck lashings, and prepare for extreme rolls. Y c. No special action as tsunamis are inconspicuous in the open ocean N d. Prepare for sudden, high-velocity wind gusts from rapidly changing directions. 1652: Small, visible mound-like protuberances on the bottom of cumulonimbus clouds, that are potential breeding grounds for waterspouts and tornadoes, are called __________.
N a. thunderheads Y b. mamma N c. rime N d. ice prisms 1681: You can expect frontal activity when two air masses collide and __________.
N a. their barometric pressures and temperatures are the same N b. there are differences in how they track along the jet stream N c. there are no significant differences between their temperatures and moisture content Y d. there are significant differences between the temperature of each air mass 1686: Which of the following statements concerning frontal movements is TRUE?
N a. The temperature rises after a cold front passes. N b. The barometric pressure rises when a warm front passes. Y c. A cold front generally passes faster than a warm front. N d. A warm front usually has more violent weather associated with it than a cold front. 1692: The force resulting from the earth's rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called __________.
N a. pressure gradient Y b. Coriolis effect N c. aurora borealis N d. ballistic deflection 1695: Compared to a low pressure system, generally the air in a high is __________.
N a. warmer, less dense, and less stable Y b. cool, more dense, and drier N c. muggy and cloudy N d. extremely moist with high relative humidity 1772: The GP of a body for a high altitude sight is determined from the declination and the __________.
Y a. Greenwich hour angle N b. azimuth N c. zenith distance N d. right ascension 1772: The GP of a body for a high altitude sight is determined from the declination and the __________.
Y a. Greenwich hour angle N b. azimuth N c. zenith distance N d. right ascension 1794: Why are low altitude sun sights not generally used?
Y a. Errors due to unusual refraction may exist. N b. Sextants may have large errors at small angles of elevation. N c. Modern sight reduction tables are not complete for low altitudes below 5°. N d. The glare on the horizon causes irradiation errors. 1904: In the horizon system of coordinates what is equivalent to the parallels of declination of the celestial equator system?
N a. Vertical circles Y b. Parallels of altitude N c. Zenith distance N d. Azimuth angle 1906: In the horizon system of coordinates what is equivalent to latitude on the Earth?
Y a. Altitude N b. Zenith N c. Declination N d. Zenith distance 1907: Information about direction and velocity of rotary tidal currents is found in the __________.
N a. Tide Tables N b. Nautical Almanac Y c. Tidal Current Tables N d. Mariner's Guide 1978: A celestial body's complete orbit around another body is __________.
N a. a rotation Y b. a revolution N c. space motion N d. nutation 2143: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
Y a. Red over amber (yellow) N b. Green over amber (yellow) N c. Red over Green N d. Green over Red 2143: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
Y a. Red over amber (yellow) N b. Green over amber (yellow) N c. Red over Green N d. Green over Red 2152: Permanent magnetism is found in __________.
Y a. hard iron N b. soft iron N c. vertical iron only N d. horizontal iron only 2162: The new Moon cannot be seen because the Moon is __________.
N a. in the opposite direction of the Sun N b. below the horizon Y c. between the Earth and the Sun N d. at quadrature 2176: The illustration 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. Three red lights N b. Two red lights Y c. One red light N d. One amber light 2186: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic west but the compass reads 266°. What action should be taken?
N a. Adjust the compass with the athwartships magnets until the compass reads 268°. N b. Adjust the compass with the fore-and-aft magnets until the compass reads 270°. N c. Adjust the compass with the quadrantal spheres until the compass reads 274°. Y d. Adjust the compass with the fore-and-aft magnets until the compass reads 268°. 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 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 2360: What U.S. agency is responsible for NAVAREA warnings?
N a. Coast Guard N b. National Oceanic and Atmospheric Administration N c. National Ocean Service Y d. National Geospatial-Intelligence Agency 2424: Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which of the topmarks shown? (D046NG )
Y a. A N b. B N c. C N d. D 2616: What is the equivalent of 4 min. 04 sec. in arc units?
N a. 60°16' N b. 8°08' N c. 2°08' Y d. 1°01' 2801: Mean high water is used __________.
N a. as the reference for soundings on the Gulf coast of the U.S. Y b. to indicate the shoreline where there is a large tidal fluctuation N c. as the reference plane for bottom contour lines N d. as the sounding datum for rivers, lakes, etc. regulated by locks 2843: A position obtained by applying ONLY your vessel's course and speed to a known position is a __________.
N a. fix N b. running fix Y c. dead-reckoning position N d. probable position 2869: A pillar buoy is indicated by which letter shown in the illustration? (D044NG )
N a. A N b. B Y c. C N d. D 2954: You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T. The range appears as shown and is closing. Which action should you take? (D047NG )
N a. Continue on the present heading until the range is in line then alter course to the left. N b. Immediately alter course to the right to bring the range in line. Y c. Continue on course until the range is closed, then alter course to the right. N d. Immediately alter course to 309°T. 3067: Which of the following are data layer categories to be displayed on ECDIS?
N a. ECDIS warnings and messages N b. Hydrographic Office data N c. Notice to Mariners information Y d. All of the above 3084: An ECDIS is required to display which information?
Y a. Soundings N b. Waypoints N c. Meteorological data N d. Radar targets 3108: Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT __________.
N a. navigation status N b. ship's heading Y c. port of origin N d. time stamp