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.
84: When using an echo sounder in deep water, it is NOT unusual to __________.
Y a. receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night N b. receive a first return near the surface during the day, and a strong return at about 200 fathoms (366 meters) at night N c. receive false echoes at a constant depth day and night N d. have to recalibrate every couple of days due to inaccurate readings 99: You are enroute to Jacksonville, FL, from San Juan, P.R. There is a fresh N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.
N a. smoother seas and warmer water Y b. steeper waves, closer together N c. long swells N d. cirrus clouds 227: The class of tide that prevails in the greatest number of important harbors on the Atlantic Coast is __________.
N a. interval N b. mixed N c. diurnal Y d. semidiurnal 281: A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________.
N a. white light Y b. red light N c. green light N d. light characteristic of Morse (A) 394: An instrument designed to maintain a continuous record of atmospheric pressure is a(n) __________.
N a. mercurial barometer N b. aneroid barometer Y c. barograph N d. thermograph 470: You are underway on course 120°T and can make 12 knots. The eye of a hurricane bears 150°T at 120 miles. The hurricane is on course 295° at 20 knots. What course should you steer at 12 knots to have the maximum CPA?
N a. 312° N b. 330° Y c. 348° N d. 001° 486: Tropical cyclones do not form within 5° of the Equator because __________.
N a. there are no fronts in that area N b. it is too hot N c. it is too humid Y d. of negligible Coriolis force 566: You are attempting to locate your position relative to a hurricane in the Northern Hemisphere. If the wind direction remains steady, but with diminishing velocity, you are most likely __________.
N a. in the right semicircle N b. in the left semicircle N c. on the storm track ahead of the center Y d. on the storm track behind the center 580: On 21 January 1981, you observe a back sight of the Sun's lower limb. The sextant altitude (hs) is 121°31.5'. The index error is 2.5' on the arc. The height of eye is 31 feet (9.3 meters). What is the observed altitude (Ho)?
N a. 31°06.2' Y b. 58°53.1' N c. 58°12.2' N d. 58°03.2' 597: You will be loading in Boston Harbor to a maximum draft of 32'06". The charted depth of an obstruction in the channel near Boston Light is 30 feet and you wish to have 3 feet of keel clearance. The steaming time from the pier to the obstruction is 01h 05m. What is the latest time (ZD +4) you can sail on 17 May 1983 and meet these requirements?
N a. 1610 Y b. 1728 N c. 1821 N d. 2350 700: You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.
N a. smoother seas and warmer water N b. long swells Y c. steeper waves, closer together N d. cirrus clouds 735: The period of the Earth's revolution from perihelion to perihelion is the __________.
N a. astronomical year Y b. anomalistic year N c. solar year N d. sidereal year 747: The movement of water away from the shore or downstream is called a(n) __________.
N a. reversing current Y b. ebb current N c. flood current N d. slack current 811: Under the IALA-A Buoyage System, a green spar buoy with a triangular topmark would indicate that the buoy __________.
Y a. should be left to port when heading out to sea N b. may be left close aboard on either side N c. is on the north side of a point of interest N d. is marking the preferred channel 843: The line which connects the points of zero magnetic dip is __________.
N a. an agonic line Y b. the magnetic equator N c. a magnetic meridian N d. All of the above 901: Under the IALA-A Buoyage System, a buoy indicating that the preferred channel is to port when entering from seaward, can have a __________.
N a. can shape N b. group-flashing (2) light N c. red-and-green vertical stripes Y d. green light 964: The thin, whitish, high clouds composed of ice crystals, popularly known as "mares' tails" are __________.
Y a. cirrus N b. cirrocumulus N c. altostratus N d. nimbostratus 970: You are preparing a weather report form, WS Form B-80. The sky is overcast, and the anemometer indicates that the apparent wind is from 144° relative at 8 knots. You are on course 162°T at 15 knots. How should you encode group Nddff? (D041NG )
N a. 91521 Y b. 83322 N c. 81408 N d. 01615 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 1154: The speed at which an ocean wave system advances is called __________.
N a. wave length N b. ripple length Y c. group velocity N d. wave velocity 1162: A line connecting all possible positions of your vessel at any given time is a __________.
N a. longitude line N b. latitude line Y c. line of position N d. fix 1215: Daylight savings time is a form of zone time that adopts the time __________.
N a. two zones to the east N b. two zones to the west Y c. one zone to the east N d. one zone to the west 1284: The Sailing Directions (Enroute) contain information on all of the following EXCEPT __________.
Y a. ocean currents N b. outer dangers to navigation N c. tidal currents N d. major port anchorages 1341: The height of a light is measured from which reference plane?
N a. Mean low water Y b. Mean high water N c. Average water level N d. Geographical sea level 1411: The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen __________.
N a. under existing visibility conditions N b. under perfect visibility Y c. with ten miles visibility N d. with fifteen miles visibility 1491: You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing?
N a. 138° N b. 270° N c. 318° Y d. 000° 1504: The time meridian used when computing the height of tide for Pensacola Bay, FL, is __________.
N a. 75°00'W N b. 82°30'W Y c. 90°00'W N d. 97°30'W 1507: When you are steering on a pair of range lights and find the upper light is above the lower light you should __________.
N a. come right N b. come left N c. wait until the lights are no longer in a vertical line Y d. continue on the present course 1517: When determining compass error by an azimuth of Polaris, you enter the Nautical Almanac with the __________.
N a. GHA Aries Y b. LHA Aries N c. LHA Polaris N d. GHA Polaris 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 1521: To avoid error you should read the scale of an aneroid barometer with your eye placed __________.
N a. to the right of the pointer N b. to the left of the pointer Y c. directly in front of the pointer N d. slightly above the meniscus 1619: Sextant A reads __________. (D043NG )
Y a. 29°42.7' N b. 29°45.7' N c. 29°51.8' N d. 30°47.2' 1648: A sign of thunderstorm development is a cumulus cloud __________.
N a. darkening, growing in size and forming an anvil top N b. that shows extensive vertical development N c. creating cold downdrafts that are felt on the ground Y d. All of the above 1718: A hurricane is characterized by winds of __________.
N a. up to 33 knots N b. 34 to 47 knots N c. 48 to 63 knots Y d. 64 knots or greater 1776: A vessel operating on the Great Lakes, and whose position is southeast of an eastward-moving storm center, would NOT experience __________.
N a. a falling barometer N b. lowering clouds and drizzle Y c. a northeast wind N d. rain or snow 1811: To find a magnetic compass course from a true course you must apply __________.
N a. deviation Y b. deviation and variation N c. variation N d. magnetic anomalies (local disturbances) 1883: Pressure gradient is a measure of __________.
N a. a high-pressure area Y b. pressure difference over horizontal distance N c. pressure difference over time N d. vertical pressure variation 1887: The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 15 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
N a. 12.0 miles N b. 11.0 miles N c. 10.0 miles Y d. 9.0 miles 1898: 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. 14312 N b. 25134 N c. 21105 Y d. 11032 1990: The navigational triangle uses parts of two systems of coordinates, one of which is the celestial equator system, the other system is the __________.
N a. terrestrial system Y b. horizon system N c. astronomical system N d. ecliptic system 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 2160: Information for updating nautical charts is primarily found in the __________.
Y a. Notice to Mariners N b. Coast Pilots N c. nautical chart catalogs N d. Sailing Directions 2169: To make sure of getting the full advantage of a favorable current, you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?
Y a. 30 minutes before the predicted time N b. One hour after the predicted time N c. At the predicted time N d. 30 minutes before flood, one hour after ebb 2212: Which information is found in the chart title?
N a. Number of the chart N b. Edition date N c. Variation information Y d. Survey information 2246: The speed of an ocean current is dependent on __________.
Y a. the density of the water N b. the air temperature N c. the presence of a high pressure area near it N d. underwater soil conditions 2254: A rock and sand structure extending from the bank of the river toward the channel is known as a __________.
Y a. wingdam N b. towhead N c. cutoff N d. landwall 2419: A backlash below a lock is defined as a __________.
N a. current setting your vessel on the wall N b. current setting into the lock chamber Y c. an eddy working along the lower guide wall N d. current setting counterclockwise 2440: You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse?
N a. 003° N b. 227° Y c. 177° N d. 363° 2490: A vertex of the navigational triangle is NOT located at the __________.
N a. elevated pole N b. celestial body N c. zenith Y d. coaltitude 2506: Which is TRUE on the Western Rivers when a vessel downbound with a following current is meeting an upbound vessel?
Y a. She has the right of way only if she is a power-driven vessel. N b. She has the right of way only if she has a tow. N c. She does not have the right of way, since the other vessel is not crossing the river. N d. She must wait for a whistle signal from the upbound vessel. 2520: When correcting the sextant altitude to apparent altitude you are correcting for inaccuracies in the reference level and __________.
N a. the equivalent reading to the center of the body N b. the equivalent reading from the center of the Earth Y c. for inaccuracies in the instrument N d. the bending of the rays of light from the body 2644: The sidereal day begins __________.
N a. when the sun is over the first point of Aries N b. when the first point of Aries is over 180° longitude Y c. when the first point of Aries is over the upper branch of the reference meridian N d. at 0000 on 1 January (Sidereal Date) 2654: What is the equivalent of 5°54' in time units?
N a. 20 min. 16 sec. Y b. 23 min. 36 sec. N c. 25 min. 54 sec. N d. 30 min. 27 sec. 2703: Which publication indicates the HYDROLANTS or HYDROPACS issued since the previous working day?
N a. Broadcast Notice to Mariners N b. Local Notice to Mariners Y c. Daily Memorandum N d. Summary of Corrections 2809: The diurnal variation of pressure is not visible in the middle latitudes in winter because __________.
Y a. it is masked by the pressure changes of moving weather systems N b. the decreased gravitational effect from the sun causes the variation to fade N c. the decreased average temperature is less than the critical temperature N d. the increased Coriolis force disperses the pressure variation 2892: The Light List indicates that a dayboard is a type NB. You should __________.
N a. see a black triangle N b. look for another daymark forming a range Y c. expect a daymark of no lateral significance N d. check to enter the correct channel at the junction daymark 2923: You should plot your dead reckoning position __________.
N a. from every estimated position Y b. from every fix or running fix N c. every three minutes in pilotage waters N d. only in pilotage waters 2929: On 29 June 1981 you observe a back sight of the lower limb of the Moon. The sextant altitude (hs) is 114°16.9'. The height of eye is 36 feet and the index error is 2.0' on the arc. The horizontal parallax is 60.5'. What is the observed altitude (Ho)?
Y a. 66°31.6' N b. 66°31.0' N c. 66°28.8' N d. 66°26.0' 3041: The letter H in illustration D006NG represents the __________.
N a. refractive horizon N b. geoidal horizon N c. celestial horizon Y d. visible horizon 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