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.
7: The period at high or low tide during which there is no change in the height of the water is called the __________.
N a. range of the tide N b. plane of the tide Y c. stand of the tide N d. reversing of the tide 45: The navigator aboard a ship at approximately 165°E longitude observes the Sun at ZT 14-25-04 on 21 September. What is the GMT and Greenwich date of the observation?
Y a. 03-25-04, 21 September N b. 02-25-04, 21 September N c. 01-25-04, 21 September N d. 01-25-04, 20 September 66: What will a veering wind do?
Y a. Change direction in a clockwise manner in the Northern Hemisphere N b. Circulate about a low pressure center in a counterclockwise manner in the Northern Hemisphere N c. Vary in strength constantly and unpredictably N d. Circulate about a high pressure center in a clockwise manner in the Southern Hemisphere 123: If the radio signal ground wave extends out for less distance than the minimum skywave distance, there is an area in which no signal is received. This is called the __________.
Y a. skip zone N b. blackout zone N c. diffraction zone N d. shadow zone 184: When the index and horizon mirrors of a properly adjusted sextant are at an angle of 45° to each other, the arc reads __________.
N a. 22 1/2° N b. 45° N c. 60° Y d. 90° 274: Which of the four adjustable errors in the sextant causes side error?
Y a. Horizon glass not being perpendicular to the frame N b. Index mirror not being perpendicular to the frame N c. Telescope not being parallel to the frame N d. Elliptical centering error 291: A buoy marking a wreck will show a(n) __________.
Y a. white light FL (2) and a topmark of 2 black spheres N b. occulting green light and may be lettered N c. yellow light and will be numbered N d. continuous quick white light and may be numbered 304: In order to remove index error from a sextant, you should adjust the __________.
N a. index mirror to make it parallel to the horizon glass with the index set at zero Y b. horizon glass to make it parallel to the index mirror with the index set at zero N c. horizon glass to make it parallel to the sextant frame N d. telescope to make it perpendicular to the sextant frame 488: A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude?
N a. 13°E Y b. 87°E N c. 177°E N d. 177°W 499: Which of the symbols shown represents an occluded front? (D018NG )
N a. A N b. B N c. C Y d. D 500: The National Geospatial-Intelligence Agency (formerly the National Imagery and Mapping Agency) would produce a chart of the coast of __________.
N a. Alaska Y b. Canada N c. Puerto Rico N d. Hawaii 579: Low pressure disturbances, which travel along the intertropical convergence zone, are called __________.
N a. permanent waves N b. tidal waves Y c. tropical waves N d. tropical storms 595: In the navigational triangle, the angle at the elevated pole is the __________.
Y a. meridian angle N b. altitude N c. right ascension N d. azimuth angle 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 701: In the IALA Buoyage System, buoys with alternating red and green horizontal bands are used to indicate __________.
N a. fishing areas N b. spoil grounds Y c. the preferred channel N d. isolated dangers 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 907: In which month will the equatorial counter current be strongest?
N a. January N b. April Y c. August N d. October 962: Chart legends which indicate a conspicuous landmark are printed in __________.
N a. underlined letters N b. boldfaced print N c. italics Y d. capital letters 1004: A low, uniform layer of cloud resembling fog, but not resting on the ground, is called __________.
N a. cumulus N b. nimbus Y c. stratus N d. cirrus 1017: Which statement(s) concerning the effect of Coriolis force on ocean currents is(are) correct?
N a. The deflection of the current is to the left in the Northern Hemisphere. N b. The Coriolis force is greater in the lower latitudes. Y c. The Coriolis force is more effective in deep water. N d. All of the above 1025: A first magnitude star is __________.
Y a. 2.5 times as bright as a second magnitude star N b. 3 times as bright as a second magnitude star N c. 5 times as bright as a second magnitude star N d. 10 times as bright as a second magnitude star 1076: Which is TRUE concerning the speed of fronts?
Y a. Cold fronts move faster than warm fronts. N b. Cold fronts move slower than warm fronts. N c. Cold fronts and warm fronts move with equal speed. N d. Cold fronts move slower at the northern end and faster at the southern end. 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 1145: The GHA of a star __________.
Y a. increases at a rate of approximately 15° per hour N b. increases at a rate of approximately 4° per hour N c. decreases at a rate of approximately 15° per hour N d. decreases at a rate of approximately 4° per hour 1245: You can follow the approach of a dangerous cyclonic storm by inspecting __________.
Y a. a newspaper, a weather map, a weather fax, or a weather forecast N b. the National Weather Service Observing Handbook No.1, Marine Surface Observations N c. the Coast Pilot or Sailing Directions N d. the sky overhead 1249: What is the light characteristic of a lighted, preferred-channel buoy?
N a. Fixed and flashing N b. Continuous quick N c. Isophase Y d. Composite group-flashing 1253: The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is __________.
Y a. deviation N b. variation N c. compass error N d. dip 1293: Deviation is caused by __________.
N a. changes in the earth's magnetic field N b. nearby magnetic land masses or mineral deposits Y c. magnetic influence inherent to that particular vessel N d. the magnetic lines of force not coinciding with the lines of longitude 1333: If a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE?
Y a. Compass error and variation are equal. N b. Compass north will be true north. N c. Variation will equal deviation. N d. There will be no compass error. 1426: Fog is most commonly associated with a(n) __________.
Y a. warm front at night N b. low pressure area N c. anticyclone N d. cold front in the spring 1460: What is the major advantage of a rhumb line track?
Y a. The vessel can steam on a constant heading (disregarding wind, current, etc.). N b. The rhumb line is the shortest distance between the arrival and departure points. N c. It is easily plotted on a gnomonic chart for comparison with a great circle course. N d. It approximates a great circle on east-west courses in high latitudes. 1548: The Illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "K" represents a __________. (D042NG )
Y a. hurricane N b. thunderstorm N c. convergence zone N d. convergence line 1613: Where would you find information concerning the duration of slack water?
N a. Tide Tables Y b. Tidal Current Tables N c. American Practical Navigator N d. Sailing Directions 1660: Which of the following is TRUE of advection fog?
N a. It commonly occurs on coastal waters during cold seasons. N b. It moves in a bank or dense cloud. N c. It is caused by warmer air moving to a cooler location. Y d. All of the above 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 1766: You are approaching a lock and see a flashing amber light located on the lock wall. You should __________.
N a. stand clear of the lock entrance Y b. approach the lock under full control N c. enter the lock as quickly as possible N d. hang off your tow on the lock wall 1802: What is the major advantage of high altitude observations?
N a. Errors due to unusual parallax are eliminated. Y b. The same body can be used for a fix from observations separated by several minutes. N c. The declination is the only information needed from the almanac. N d. The semidiameter correction of the sextant altitude is eliminated. 1841: The letter A as shown represents the __________. (D006NG )
Y a. sensible horizon N b. geoidal horizon N c. visible horizon N d. celestial horizon 1860: A vessel heading WSW is on a course of __________.
N a. 202.5° N b. 225.0° Y c. 247.5° N d. 271.0° 1982: In the horizon system of coordinates what is equivalent to the Greenwich hour angle of the celestial equator system?
N a. Zenith distance N b. Coaltitude N c. Altitude Y d. Azimuth 2040: A vessel heading NNE is on a course of __________.
Y a. 022.5° N b. 045.0° N c. 067.5° N d. 090.0° 2050: The point where the vertical rise or fall of tide has stopped is referred to as __________.
N a. slack water N b. the rip tide Y c. the stand of the tide N d. the reverse of the tide 2054: The diagram is of a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter B? (D038NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No lights 2086: You are downbound on the Ohio River locking through Greenup. The chamber has been emptied and the lower gates are open. You hear one short blast of the whistle from the lock. You should __________.
Y a. leave the lock N b. hold up until another tow enters the adjacent lock N c. tie off to the guide wall until the river is clear of traffic N d. hold in the lock chamber due to a malfunction with the gate 2088: Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained by consulting the __________.
N a. Sailing Directions N b. Light List Vol. V N c. U.S. Coast Pilot Y d. Broadcast Notice to Mariners 2089: Permission to leave the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal?
N a. One short blast Y b. Two short blasts N c. One long blast N d. Two long blasts 2102: The subregions of the United States Gulf and East Coasts are numbered 11, 12 and 13 within the chart numbering system. Which chart number indicates a chart for either the Gulf or East Coast?
N a. 21214 Y b. 11314 N c. 14313 N d. 14114 2158: Permanent magnetism is caused by __________.
N a. operation of electrical equipment and generators on board ship Y b. the earth's magnetic field affecting the ship's hard iron during construction N c. the horizontal component of the earth's magnetic field acting on the horizontal soft iron N d. the vertical component of the earth's magnetic field acting on the vertical soft iron 2242: A vessel is heading magnetic north and its magnetic compass indicates a heading of 356°. Which action should be taken to remove this error during compass adjustment?
Y a. If the red ends of the magnets are to port you should lower the athwartships tray. N b. If the red ends of the magnets are aft you should raise the fore-and-aft tray. N c. If the blue ends of the magnets are to port, and the athwartships tray is at the top, you should remove some of the magnets. N d. If the blue ends of the magnets are aft you should raise the fore-and-aft tray. 2300: When a magnetic compass is not in use for a prolonged period of time it should __________.
Y a. be shielded from direct sunlight N b. be locked into a constant heading N c. have any air bubbles replaced with nitrogen N d. have the compensating magnets removed 2378: Which light signal indicates that you may approach the lock?
N a. Flashing red Y b. Flashing amber N c. Steady amber N d. Steady green 2423: 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 conical buoy Y b. green conical buoy N c. red can buoy N d. green can buoy 2439: Which statement about the time diagram in illustration D008NG is TRUE? (D008NG )
Y a. You are in east longitude. N b. The Sun is setting for you. N c. Your date is different from the Greenwich date. N d. The GHA is approximately 160°. 2625: Stormy weather is usually associated with regions of __________.
N a. high barometric pressure N b. changing barometric pressure Y c. low barometric pressure N d. steady barometric pressure 2687: The letter B in illustration D006NG represents the __________.
N a. celestial horizon N b. visible horizon N c. sensible horizon Y d. geoidal horizon 2831: A coastal chart could have a scale of __________.
N a. not more than 1:25,000 N b. 1:35,000 Y c. 1:100,000 N d. 1:500,000 2877: Class I and II private aids to navigation in or along navigable waters of the United States are listed in the __________.
N a. Sailing Directions Y b. Light List N c. List of Private Aids N d. Aids to Navigation Manual 2994: You take a bearing of 313° and 076° of two objects. Which bearing of a third object will give the best fix?
Y a. 014° N b. 133° N c. 255° N d. 339° 3006: You are outbound in a channel marked by a range astern. The range line is 309°T. You are steering 127°T and have the range in sight as shown. What action should you take? (D047NG )
N a. Come right to 129°T. N b. Come left until the range comes in line then alter course to 129°T. N c. Come left until the range comes in line then alter course to 125°T. Y d. Come right to close the range then when on the range steer 129°T. 3017: A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately __________.
N a. 3 hours N b. 6 1/4 hours Y c. 12 1/2 hours N d. 18 3/4 hours