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.
39: Civil twilight begins at 1910 zone time on 20 July 1981. Your DR position at that time is LAT 22°16'N, LONG 150°06'W. Which statement concerning the planets available for evening sights is TRUE?
Y a. Venus will have a westerly meridian angle. N b. Mars will set about one hour after the Sun sets. N c. Mars, Venus, Jupiter, and Saturn will be above the horizon. N d. Sights of Saturn, Jupiter, and Venus will yield a good three-line-of-position fix. 182: The scale on a chart is given as 1:5,000,000. This means that __________.
N a. 1 inch is equal to 5,000 inches on the Earth's surface N b. 1 nautical mile on the chart is equal to 5,000 inches on the Earth's surface Y c. 1 inch is equal to 5,000,000 inches on the Earth's surface N d. 1 nautical mile on the chart is equal to 5,000,000 inches on the Earth's surface 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 295: The difference (measured in degrees) between the GHA of the body and the longitude of the observer is the __________.
N a. right ascension Y b. meridian angle N c. SHA of the observer N d. zenith distance 317: The time meridian used for tide computations in New York Harbor is __________.
N a. 52°30'W N b. 60°00'W Y c. 75°00'W N d. 82°30'W 444: A sylphon cell is a part of a __________.
N a. maximum thermometer Y b. barograph N c. thermograph N d. hygrometer 446: The usual sequence of directions in which a tropical cyclone moves in the Southern Hemisphere is __________.
N a. northwest, west, and south Y b. southwest, south, and southeast N c. north, northwest, and east N d. west, northwest, and north 477: Determine the height of the tide at 1430 EST (ZD +5) at New Bedford, MA, on 10 April 1983.
N a. 1.1 feet N b. 1.2 feet Y c. 1.4 feet N d. 1.7 feet 522: All straight lines represent great circle tracks on a chart based on a(n) __________.
N a. Mercator projection N b. polyconic projection N c. orthographic projection Y d. gnomonic projection 611: Information markers, when lighted, will display __________.
N a. yellow lights N b. green lights Y c. white lights N d. red lights 702: Which publication contains information on navigation regulations, landmarks, channels, anchorages, tides, currents, and clearances of bridges for Chesapeake Bay?
Y a. Coast Pilot N b. Light List N c. Sailing Directions N d. Pilot Charts 737: What describes an ebb current?
N a. Horizontal movement of the water away from the land following low tide N b. Horizontal movement of the water toward the land following low tide Y c. Horizontal movement of the water away from the land following high tide N d. Horizontal movement of the water toward the land following high tide 746: Lines drawn through points on the Earth having the same atmospheric pressure are known as __________.
N a. isothermal N b. millibars Y c. isobars N d. seismics 750: On a working copy of a weather map, a cold front is represented by what color line?
N a. Red Y b. Blue N c. Alternating red and blue N d. Purple 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 822: Charts should be corrected by using information published in the __________.
N a. Light List N b. American Practical Navigator Y c. Notice to Mariners N d. Coast Pilot 858: Your ship is proceeding on course 320°T at a speed of 25 knots. The apparent wind is from 30° off the starboard bow, speed 32 knots. What is the relative direction, true direction and speed of the true wind?
Y a. Relative 80°true 040°T, 16.2 knots N b. Relative 40°true 080°T, 16.4 knots N c. Relative 80° true 060°T, 15.2 knots N d. Relative 60°true 040°T, 18.6 knots 906: In the Northern Hemisphere, an area of counterclockwise wind circulation surrounded by higher pressure is a __________.
Y a. low N b. high N c. warm front N d. cold front 932: To find the specific phase characteristic of a lighthouse on a sound of the United States you would use the __________.
N a. American Practical Navigator Y b. Light List N c. Nautical Chart Catalog N d. U.S. Coast Pilot 966: Most high pressure areas in the United States are accompanied by __________.
N a. precipitation Y b. clear, cool weather N c. humid, sticky weather N d. cool fogs 1003: The quadrantal spheres are used to __________.
Y a. remove deviation on the intercardinal headings N b. remove deviation on the cardinal compass headings N c. remove heeling error N d. compensate for induced magnetism in vertical soft iron 1036: A frontal thunderstorm is caused by __________.
N a. pronounced local heating N b. wind being pushed up a mountain Y c. a warm air mass rising over a cold air mass N d. an increased lapse rate caused by advection of warm surface air 1179: Which type of cloud is indicated by the number 3? (DO39NG )
Y a. Cirrocumulus N b. Altocumulus N c. Nimbostratus N d. Cumulus 1185: An orange and white buoy with a rectangle on it displays __________.
N a. directions N b. distances N c. locations Y d. All of the above 1322: What will be the velocity of the tidal current at Grant's Tomb, 123rd Street, NY, NY, at 1412 EST (ZD +5) on 22 March 1983?
N a. 0.5 knot N b. 0.8 knot Y c. 1.1 knots N d. 1.3 knots 1343: Variation is a compass error that you __________.
N a. can correct by adjusting the compass card N b. can correct by adjusting the compensating magnets N c. can correct by changing the vessel's heading Y d. cannot correct 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 1418: Static on your AM radio may be __________.
Y a. an indication of nearby thunderstorm activity N b. an indication of "clearing" weather N c. of no meteorological significance N d. a sign of strong winds 1606: Aids to navigation marking the intracoastal waterway can be identified by __________.
N a. the letters ICW after the aid's number or letter Y b. yellow stripes, squares, or triangles marked on them N c. white retroreflective material N d. the light characteristic and color for lighted aids 1696: Two well-developed high pressure areas may be separated by a __________.
N a. hill of low pressure Y b. trough of low pressure N c. valley of low pressure N d. ridge of low pressure 1702: In a cyclone the lowest pressure is found in the __________.
Y a. center N b. outer edge N c. warm front N d. cold front 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. 1815: Which weather system produces strong cold winds called "Northers" during the winter months in the Gulf of Mexico?
Y a. An anticyclone N b. A polar maritime air mass N c. A cyclone N d. A low pressure system 1824: The illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter C in the illustration? (DO36NG )
N a. One red light N b. Two green lights Y c. Three green lights N d. No light 1936: The parallel of latitude at 66°33'N is the __________.
N a. Tropic of Cancer N b. Tropic of Capricorn Y c. Arctic Circle N d. ecliptic 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 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 1988: The parallel of latitude at 23°27'N is the __________.
Y a. Tropic of Cancer N b. Tropic of Capricorn N c. Arctic Circle N d. ecliptic 1989: In the horizon system of coordinates what is the equivalent to the meridians on the Earth?
N a. Horizon N b. Hour circle Y c. Vertical circles N d. Celestial meridians 2081: You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________.
N a. 30° N b. 45° N c. 60° Y d. 90° 2093: Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained from the __________.
N a. Light List Vol. V N b. List of Lights Y c. Broadcast Notice to Mariners N d. Sailing Directions 2119: Which stock number indicates an NGA (NIMA) chart designed for fixing positions at sea and DR plotting while on a long voyage?
Y a. WOAGN520 N b. PILOT16 N c. 16BCO16212 N d. WOPZC5245 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 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 2220: A dead reckoning (DR) plot __________.
N a. must utilize magnetic courses N b. must take set and drift into account N c. should be replotted hourly Y d. should be started each time the vessel's position is fixed 2269: One of the factors which affects the circulation of ocean currents is __________.
N a. humidity Y b. varying densities of water N c. vessel traffic N d. the jet stream 2271: What is the definition of height of tide?
N a. The vertical distance from the surface of the water to the ocean floor Y b. The vertical distance from the tidal datum to the level of the water at any time N c. The vertical difference between a datum plane and the ocean bottom N d. The vertical difference between the heights of low and high water 2330: You are heading in a northerly direction when you come across an easterly current. Your vessel will __________.
Y a. be pushed to starboard N b. be pushed to port N c. decrease in engine speed N d. remain on course 2399: Which statement about the time diagram shown is TRUE? (D008NG )
N a. The Greenwich date is one day later than your date. N b. The diagram is valid only if you are in the southern hemisphere. N c. The LHA of the Sun is approximately 40°. Y d. The diagram represents a morning Sun sight. 2509: All persons or vessels within the lock area, including the lock approach channels, come under the authority of the __________.
N a. dockmaster N b. dock captain Y c. lockmaster N d. lock foreman 2510: When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________.
N a. the equivalent reading to the center of the body N b. the equivalent reading from the center of the Earth N c. the bending of the rays of light from the body Y d. inaccuracies in the reference level 2524: What is the equivalent of 2° 35' in time units?
Y a. 10 min. 20 sec. N b. 9 min. 10 sec. N c. 7 min. 06 sec. N d. 6 min. 43 sec. 2536: A revised print of a chart is made __________.
N a. after every major hydrographic survey of the area covered by the chart N b. when there are numerous corrections to be made or the corrections are extensive Y c. when a low-stock situation occurs and minor corrections are made N d. every two years to update the magnetic variation information 2639: Under the U.S. Aids to Navigation System used on the Western Rivers, aids to navigation lights on the right descending bank show __________.
Y a. white or green lights N b. white or red lights N c. green lights only N d. white lights only 2664: The Light List shows a lighted aid to navigation on the right bank. This means that the light can be seen on the port side of a vessel __________.
N a. crossing the river N b. descending the river Y c. ascending the river N d. proceeding towards sea 2706: The following types of vessels are awaiting lockage on the upper Mississippi. Which type of vessel is normally passed through the lock first?
N a. Pleasure craft N b. Commercial towboats Y c. Commercial passenger vessels N d. Commercial fishing vessels 2746: What is used to measure wind velocity?
N a. Psychrometer N b. Barometer N c. Wind sock Y d. Anemometer 2913: The Daily Memorandum contains information on __________.
N a. active weather disturbances such as hurricanes or tropical storms Y b. the latest navigational warnings N c. scheduled vessel arrivals and departures for a 24-hour period N d. water levels at river ports where run-off affects tidal heights 3010: A white buoy with a blue band is __________.
N a. an isolated danger mark N b. a hydrographic data collection buoy Y c. a mooring buoy N d. marking a restricted area 3014: Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN?
N a. C 356°T, Sp 5.5 knots Y b. C 162°T, Sp 27 knots N c. C 095°T, Sp 30 knots N d. C 268°T, Sp 22 knots