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.
15: What is the length of a nautical mile?
N a. 1,800 meters N b. 2,000 yards Y c. 6,076 feet N d. 5,280 feet 130: The distance between the surface of the water and the tidal datum is the __________.
N a. range of tide Y b. height of tide N c. charted depth N d. actual water depth 288: When using a radar in a unstabilized mode, fixes are determined most easily from __________.
N a. center bearings N b. tangent bearings Y c. ranges N d. objects that are close aboard 296: The wind flow from the horse latitudes to the doldrums is deflected due to __________.
Y a. Coriolis force N b. the mid-latitude, semi-permanent high N c. differing atmospheric pressures N d. the prevailing westerlies 301: In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?
N a. Flashing N b. Occulting N c. Quick Flashing Y d. All of the above 325: What is the longitude of the geographical position of a body whose Greenwich hour angle is 210°30'?
N a. 30°30'E N b. 59°30'W N c. 120°30'W Y d. 149°30'E 342: A polyconic projection is based on a __________.
N a. plane tangent at one point N b. cylinder tangent at one parallel N c. cone tangent at one parallel Y d. series of cones tangent at selected parallels 422: If you are sailing from the East Coast of the United States to the Caribbean Sea, which publication would contain information on weather, currents, and storms?
N a. Sailing Charts of the Caribbean Sea Y b. Pilot Charts of the North Atlantic N c. Light Lists, Atlantic and Gulf Coast N d. Tidal Current Tables 445: The values of the Greenwich hour angle and declination, tabulated in all almanacs, are for the __________.
N a. upper limb of a celestial body N b. lower limb of a celestial body Y c. centers of the various celestial bodies N d. lower limb of the Sun and Moon; center of the stars and planets 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 494: Aneroid barometers are usually calibrated to indicate atmospheric pressure in __________.
N a. inches of mercury and centimeters N b. feet of mercury and millibars N c. inches of mercury and millimeters Y d. inches of mercury and millibars 573: What is the name of the movable, radial guide line used to measure direction on a radar?
N a. Compass rose Y b. Cursor N c. Plan position indicator N d. Variable range marker 660: What is the length of a nautical mile?
N a. 1,850 meters N b. 5,280 feet N c. 1,760 yards Y d. 6,076 feet 675: 15° of latitude is equal to __________.
N a. 600 miles Y b. 900 miles N c. 1200 miles N d. 1500 miles 808: On a working copy of a weather map, a stationary front is represented by which color line?
N a. Red N b. Blue Y c. Alternating red and blue N d. Purple 824: An "atoll cloud" forming over an island due to heating of the land during the daytime would be which type?
N a. Cirrus Y b. Cumulus N c. Stratus N d. Nimbus 857: The current that, in many respects, is similar to the Gulf Stream is the __________.
Y a. Kuroshio N b. California Current N c. Oyashio N d. Benguela Current 893: One point of a compass is equal to how many degrees?
N a. 7.5 Y b. 11.25 N c. 17.5 N d. 22.5 913: How many points are there in a compass card?
N a. 4 N b. 8 N c. 24 Y d. 32 984: The bases of middle clouds are located at altitudes of between __________.
N a. 3,000 to 6,500 feet (914 to 1981 meters) Y b. 6,500 to 20,000 feet (1981 to 6096 meters) N c. 10,000 to 35,000 feet (3048 to 10,668 meters) N d. 20,000 to 60,000 feet (6096 to 18,288 meters) 1034: The expression "the air is saturated" means __________.
Y a. the relative humidity is 100% N b. the vapor pressure is at its minimum for the prevailing temperature N c. precipitation has commenced N d. cloud cover is 100% 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 1104: Which condition(s) is(are) necessary for the formation of dew?
N a. Clear skies N b. Calm air N c. Earth's surface cooler than the dew point of the air Y d. All of the above 1155: Which aid is NOT marked on a chart with a magenta circle?
N a. Radar station Y b. Aero light N c. Radio beacon N d. Radar transponder beacon 1172: Which position shown would likely have stratus or stratocumulus clouds, occasional light drizzle, steady southerlies around 10 knots, and steady temperatures? (D049NG )
N a. B N b. C N c. D Y d. E 1221: On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector __________.
N a. indicates the limits of the navigable channel Y b. indicates a danger area N c. is used to identify the characteristics of the light N d. serves no significant purpose 1289: A body can only be observed at lower transit when __________.
N a. the declination is the opposite name to the latitude N b. the algebraic sum of the colatitude and declination exceeds 90° N c. the observer is in high latitudes above either polar circle Y d. the body is circumpolar 1289: A body can only be observed at lower transit when __________.
N a. the declination is the opposite name to the latitude N b. the algebraic sum of the colatitude and declination exceeds 90° N c. the observer is in high latitudes above either polar circle Y d. the body is circumpolar 1292: A triangular daymark would be colored __________.
Y a. red N b. red and white N c. green N d. green and white 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. 1369: Which of the following is the most useful factor for predicting weather?
N a. The present reading of the barometer N b. The previous reading of the barometer N c. The difference in the barometric readings within the past 24 hours Y d. The rate and direction of change of barometric readings 1450: The distance between the surface of the water and the tidal datum is the __________.
N a. range of tide N b. charted depth Y c. height of tide N d. actual water depth 1545: The change in the length of day becomes greater as latitude increases because of the __________.
N a. inclination of the diurnal circle to the equator N b. decreasing distance between the terrestrial meridians Y c. increased obliquity of the celestial sphere N d. changing distance between the earth and the sun 1599: The time interval between successive wave crests is called the __________.
N a. trough Y b. period N c. frequency N d. epoch 1713: When a tornado moves over the water from land it is called a __________.
N a. tornado Y b. waterspout N c. hurricane N d. cyclone 1885: Under the Uniform State Waterway Marking System a mooring buoy is painted __________.
Y a. white with a blue band N b. yellow N c. any color that does not conflict with the lateral system N d. white with a green top 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 2006: What is the relative bearing of an object broad on the port beam?
N a. 315° N b. 300° Y c. 270° N d. 235° 2079: Permission to enter the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal?
N a. One short blast N b. Two short blasts N c. One long blast Y d. Two long blasts 2101: 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 __________.
Y a. Broadcast Notice to Mariners N b. Light List Vol. V N c. U.S. Coast Pilot N d. All of the above 2163: The letter C in illustration D006NG represents the __________.
N a. visible horizon N b. geoidal horizon Y c. celestial horizon N d. sensible horizon 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 2336: The period of revolution of the Moon is __________.
N a. 24 hours Y b. about 27.3 days N c. 365 days N d. about 19 years 2437: When daylight savings time is kept, the times of tide and current calculations must be adjusted. One way of doing this is to __________.
N a. add 15° to the standard meridian when calculating the time differences N b. apply no correction as the times at the reference stations are adjusted for daylight savings time Y c. add one hour to the times listed for the reference stations N d. subtract one hour from the times listed for the subordinate stations 2522: The letter H in illustration D006NG represents the __________. (D006NG )
N a. celestial horizon N b. geoidal horizon Y c. visible horizon N d. refractive horizon 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 2546: A structure, usually made of stone, or cement pilings, which extends from the bank at approximately right angles to the current is called a __________.
Y a. dike N b. revetment N c. cutoff N d. crib 2579: A phase correction may be applicable to correct the sextant altitude correction of __________.
N a. any star N b. the Sun N c. third magnitude stars only Y d. some planets 2619: In low latitudes, a first quarter Moon will always rise at about __________.
N a. sunrise Y b. 1200 LMT N c. sunset N d. 2400 LMT 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 2646: During daylight savings time the meridian used for determining the time is located farther __________.
Y a. east N b. west N c. east in west longitude and west in east longitude N d. west in west longitude and east in east longitude 2670: The angle that is measured westward from the first point of Aries to the hour circle of the body along the celestial equator is the __________.
N a. Greenwich sidereal angle N b. local sidereal time Y c. sidereal hour angle N d. azimuth angle 2674: In the U.S. Aids to Navigation System on the Western Rivers, a preferred channel buoy to be left to port while proceeding downstream will __________.
N a. have the upper band red N b. show a red light if lighted N c. have a characteristic of composite group flashing if lighted Y d. All of the above 2746: What is used to measure wind velocity?
N a. Psychrometer N b. Barometer N c. Wind sock Y d. Anemometer 2798: A can buoy is indicated by which letter in illustration D044NG?
Y a. A N b. B N c. C N d. D 2828: The daily recurring pattern of pressure changes most noticeable in low latitudes is the __________.
N a. daily lapse reading Y b. diurnal variation of pressure N c. pressure tendency N d. synoptic pressure 3007: 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. 2 1/2 hours N b. 3 1/2 hours N c. 6 1/4 hours Y d. 12 1/2 hours 3075: Chart information details to be used in ECDIS should be the latest edition of information originated by a government-authorized hydrographic office and conform to the standards of (the) __________.
N a. International Maritime Organization Y b. International Hydrographic Organization N c. NASA N d. US Coast Guard 3110: While underway, automatic identification systems (AIS) broadcast all of the following information every 1 to 10 seconds EXCEPT the __________.
N a. speed over ground N b. latitude and longitude N c. course over ground Y d. ship's scantlings 3126: Which of the following statements is TRUE regarding automatic identification systems (AIS)?
N a. AIS will not provide information on another vessel if that vessel is indistinguishable in radar sea clutter. N b. AIS can be relied upon as the sole means to determine risk of collision and safe speed. N c. AIS is designed to replace ARPA, maneuvering boards, and visual bearings as a means to ascertain the risk of collision. Y d. AIS provides the other vessel's identity, dimensions and navigational status regardless of visibility.