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.
77: When there are small differences between the heights of two successive high tides or two low tides, in a tidal day, the tides are called __________.
N a. diurnal Y b. semidiurnal N c. solar N d. mixed 95: The difference in local time between an observer on 114°W and one on 119°W is __________.
N a. 1.25 minutes N b. 5 minutes Y c. 20 minutes N d. 75 minutes 196: The area of strong westerly winds occurring between 40°S and 60°S latitude is called the __________.
N a. polar easterlies N b. prevailing westerlies Y c. roaring forties N d. jet streams 236: The winds with the greatest effect on the set, drift, and depth of the equatorial currents are the __________.
N a. doldrums N b. horse latitudes Y c. trade winds N d. prevailing westerlies 243: The loran lines drawn on navigation charts represent __________.
Y a. ground waves N b. skywaves N c. either ground waves or skywaves interchangeably N d. an average between ground wave and skywave positions 260: The National Ocean Service publishes the __________.
N a. Light Lists Y b. Coast Pilots N c. pilot charts N d. Sailing Directions 265: It is 1200 local time for an observer at 54°E longitude. Which statement is TRUE?
N a. It is afternoon at Greenwich. N b. It is midnight at 126°E longitude. Y c. The observer is in time zone -4. N d. All of the above are true. 276: The region of high pressure extending around the Earth at about 35°N latitude is called the __________.
N a. prevailing westerlies Y b. horse latitudes N c. troposphere N d. doldrums 282: The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic describes the light?
N a. It is visible 10 miles. N b. Its distinguishing number is "19M". N c. It has a radar reflector. Y d. None of the above 379: The steady current circling the globe at about 60°S is the __________.
N a. Prevailing Westerly N b. Sub-Polar Flow Y c. West Wind Drift N d. Humboldt Current 404: An aneroid barometer is an instrument __________.
N a. used to measure the speed of wind Y b. in which the pressure of the air is measured N c. that tells which direction a storm is coming from N d. used to measure the height of waves 430: The southeast trade winds actually blow toward the __________.
N a. southeast N b. south N c. east Y d. northwest 471: Yellow lights may appear on __________.
Y a. special purpose buoys N b. vertically-striped buoys N c. horizontally-banded buoys N d. spherical buoys 539: You are underway on course 050°T and your maximum speed is 13 knots. The eye of a hurricane bears 120°T, 100 miles from your position. The hurricane is moving towards 265°T at 25 knots. What course should you steer at 13 knots to have the maximum CPA?
Y a. 324°T N b. 306°T N c. 299°T N d. 276°T 561: Buoys which mark dredging areas are painted __________.
N a. black Y b. yellow N c. green N d. red 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 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 842: Coast Pilots and navigational charts are kept corrected and up-to-date by using the __________.
N a. pilot charts Y b. Notices to Mariners N c. Tide Tables N d. Current Tables 865: The radius of a circle of equal altitude of a body is equal to the __________.
Y a. coaltitude of the body N b. altitude of the body N c. codeclination of the body N d. polar distance 879: You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 346°T at 68 miles from you. What is the course to steer at 13 knots to intercept vessel A?
Y a. 328° N b. 323° N c. 318° N d. 314° 910: The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 38 feet (11.6 meters) and the visibility is 5.5 miles. At what approximate range will you FIRST sight the light?
N a. 5.5 miles N b. 6.3 miles Y c. 8.0 miles N d. 12.0 miles 915: The Sun's center may be coincident with both the celestial equator and the observer's prime vertical circle when __________.
N a. it crosses the December solstitial point N b. it crosses the June solstitial point N c. it is in upper transit Y d. its declination is zero 995: What is the equivalent of 83°29.6' in time units?
N a. 5h 47m 34.8s N b. 5h 18m 22.7s N c. 5h 01m 42.3s Y d. 5h 33m 58.4s 1023: Which compensates for induced magnetism in the horizontal soft iron of a vessel?
Y a. Iron spheres mounted on the binnacle N b. A single vertical magnet under the compass N c. The Flinders bar N d. Magnets in trays inside the binnacle 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 1151: Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?
N a. A safe-water buoy will display red and white vertical stripes of reflective material. N b. All reflective material is white because it is the most visible at night. N c. A special-purpose mark will display either red or green reflective material to agree with its shape. Y d. A preferred-channel buoy displays either red or green reflective material to agree with the top band of color. 1157: How many slack tidal currents usually occur each day on the east coast of the United States?
N a. One N b. Two N c. Three Y d. Four 1175: Solid green arrows on the main body of a pilot chart indicate __________.
N a. prevailing wind directions Y b. prevailing ocean current directions N c. probable surface current flow N d. shortest great circle routes 1214: The letter B in the diagram represents the __________. (D006NG )
N a. sensible horizon N b. visible horizon N c. celestial horizon Y d. geoidal horizon 1314: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates hail? (D042NG )
N a. N Y b. H N c. Q N d. F 1377: What is the velocity of the tidal current at the east end of Pollock Rip Channel at 1700 DST (ZD +4) on 23 July 1983?
N a. 0.6 knot ebbing N b. 0.8 knot flooding Y c. 1.5 knots flooding N d. 1.9 knots flooding 1390: The fog most commonly encountered at sea is called __________.
N a. conduction fog N b. radiation fog N c. frontal fog Y d. advection fog 1400: Which type of cloud is among the most dependable for giving an indication of an approaching weather system?
N a. Cumulus Y b. Altostratus N c. Cumulostratus N d. Nimbus 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. 1519: You are preparing a weather report form, WS Form B-80. Your position is LAT 10°38'S, LONG 00°14'E. How would this be encoded? (D041NG )
N a. LAT 10.6°S, LONG 00.2°E N b. L106S, 30002 N c. 10385, 0014E Y d. 99106, 30002 1614: Hot air can hold __________.
N a. less moisture than cold air Y b. more moisture than cold air N c. the same amount of moisture as cold air N d. moisture independent of air temperature 1627: An instrument that maintains a continuous record of humidity changes is called a __________.
N a. thermometer N b. barometer Y c. hygrograph N d. thermograph 1712: Tornados are often associated with __________.
N a. winds in the warm sector ahead of a cold front and travel from southwest towards the east or northeast N b. squall lines and very heavy thunderstorm activity N c. winds that may be in excess of 200 knots and destructive funnel clouds 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 1755: Which weather system produces strong cold winds called "Northers" during the winter months in the Gulf of Mexico?
N a. An anticyclone N b. A high pressure system N c. A cyclone Y d. Both A and B 1820: Information on the operating times and characteristics of foreign radio beacons can be found in which publication?
Y a. List of Lights N b. Coast Pilot N c. Sailing Directions N d. List of Radio beacons 1859: While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers this is a __________.
N a. special purpose signal N b. passing daymark Y c. crossing daymark N d. cable crossing 1923: Little or no change in the barometric reading over a twelve hour period indicates __________.
N a. stormy weather is imminent Y b. that present weather conditions will continue N c. a defect in the barometer N d. increasing wind strength 2058: Illustration D038NG represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter D in the illustration? (D038NG )
N a. One red light N b. Two green lights Y c. Three green lights N d. No lights 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 2190: Clouds are classified according to their __________.
N a. size N b. moisture content Y c. altitude and how they were formed N d. location in a front 2214: By convention, the Earth's south magnetic pole is colored __________.
N a. blue N b. black N c. white Y d. red 2239: A flashing green light displayed at a single lock means that the lock is __________.
Y a. ready for entrance N b. ready for entrance, but gates cannot be closed completely N c. being made ready for entrance N d. not ready for entrance 2256: The constellation that contains Polaris is __________.
N a. Orion N b. Cassiopeia Y c. Ursa Minor N d. Corona Borealis 2258: The primary use of apparent time in marine navigation is to __________.
N a. calculate sunrise or sunset N b. determine zone time N c. enter an almanac Y d. determine the time of meridian transit 2280: Which would influence a magnetic compass?
N a. Electrical wiring N b. Iron pipe N c. Radio Y d. All of the above 2338: A group of stars which appear close together and form a striking configuration such as a person or animal is a __________.
N a. cluster N b. shower Y c. constellation N d. galaxy 2397: The letter D in illustration D006NG represents the __________.
N a. sensible horizon N b. celestial horizon N c. visible horizon Y d. geometrical horizon 2448: What is the equivalent of 37 min. 32 sec. in arc units?
N a. 4°47' N b. 6°38' N c. 7°41' Y d. 9°23' 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 2609: The letter A in illustration D006NG represents the __________. (D006NG )
N a. geoidal horizon N b. celestial horizon N c. visible horizon Y d. sensible horizon 2694: What is the equivalent of 10°48' in time units?
N a. 2 min. 39 sec. N b. 20 min. 12 sec. Y c. 43 min. 12 sec. N d. 50 min. 12 sec. 2810: When steering a tow downstream around the shape of a sand bar, and staying on the proper side of the buoys, an operator should be cautious of __________.
Y a. eddies under the bar N b. swift current under the bar causing loss of control N c. cross-currents pushing the tow away from the bar N d. cross-currents pushing the tow into the bar 2891: Twenty-three meters equals __________.
N a. 17.50 feet Y b. 75.46 feet N c. 96.00 feet N d. 104.99 feet 3068: Which of the following data layer categories is NOT displayed on ECDIS?
N a. Notice to Mariners information N b. ECDIS warnings and messages Y c. Ship hydrodynamic information N d. Hydrographic Office data