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.
29: You are approaching a multiple-span bridge at night. The main navigational channel span will be indicated by __________.
N a. a quick flashing red or green aid to navigation N b. a steady blue light in the center of the span Y c. 3 white lights in a vertical line in the center of the span N d. a flashing green light in the center of the span126: A katabatic wind blows __________.
N a. up an incline due to surface heating N b. in a circular pattern Y c. down an incline due to cooling of the air N d. horizontally between a high and a low pressure area301: 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 above414: The barometer is an instrument for measuring the __________.
N a. temperature N b. relative humidity N c. dew point Y d. atmospheric pressure424: For an accurate barometer check, you would __________.
N a. check it with a barometer on another vessel N b. take readings from several barometers and average them N c. check it with the barometer at the ship chandlery Y d. check it against radio or National Weather Service reports of the immediate vicinity482: Which statement about a gnomonic chart is correct?
N a. A rhumb line appears as a straight line. N b. Distance is measured at the mid-latitude of the track line. N c. Meridians appear as curved lines converging toward the nearer pole. Y d. Parallels, except the equator, appear as curved lines.577: Your vessel has a draft of 24 feet. On 7 April 1983 you wish to pass over a temporary obstruction near Lovell Island, MA, that has a charted depth of 22 feet. Allowing for a safety margin of 3.1 feet under your keel, what is the earliest time after 0100 EST (ZD +5) that this passage can be made?
N a. 0248 N b. 0304 Y c. 0342 N d. 0356598: A great circle crosses the equator at 141°E. It will also cross the equator at what other longitude?
N a. 180°E N b. 41°E N c. 141°W Y d. 39°W630: What kind of weather would you expect to accompany the passage of a tropical wave?
Y a. Heavy rain and cloudiness N b. Good weather N c. A tropical storm N d. Dense fog645: The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°, is the __________.
N a. altitude Y b. declination N c. latitude N d. azimuth angle687: 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 above718: You are to sail from Elizabethport, NJ, on 22 May 1983 with a maximum draft of 28 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 27 feet. The steaming time from Elizabethport to the obstruction is 1h 40m. What is the earliest time (ZD +4) you can sail on the afternoon of 22 May and pass over the obstruction with 3 feet of clearance?
Y a. 1407 N b. 1331 N c. 1303 N d. 1242726: Atmospheric pressure at sea level is equal to __________.
N a. 14.7 pounds per square inch N b. 29.92 inches of mercury N c. 1013.25 millibars Y d. All of the above749: You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 264°T at 68 miles from you. What is the course to steer at 13 knots to intercept vessel A?
N a. 249° Y b. 256° N c. 262° N d. 268°816: Cyclones that have warm sectors usually move __________.
N a. westerly Y b. parallel to the isobars in the warm sector N c. toward the nearest high pressure area N d. faster than the accompanying cold front954: A thin, whitish, high cloud popularly known as "mares' tails" is __________.
N a. altostratus N b. stratus N c. cumulus Y d. cirrus961: In which country would you expect the channels to be marked with the IALA-B Buoyage System?
Y a. Brazil N b. Tanzania N c. New Zealand N d. Norway965: In order for a star to be used for a sight at lower transit, the star must __________.
Y a. be circumpolar N b. have a declination equal to or greater than your latitude N c. have a GHA of 180° N d. have the SHA equal to or less than the LHA1083: Magnets are placed in horizontal trays in the compass binnacle to compensate for the __________.
N a. induced magnetism in the vessel's horizontal soft iron N b. change in the magnetic field when the vessel inclines from vertical Y c. permanent magnetism of the vessel N d. magnetic fields caused by electrical currents in the vicinity1176: After a cold front passes, the barometric pressure __________.
N a. drops, and the temperature drops N b. drops, and the temperature rises Y c. rises, and the temperature drops N d. rises, and the temperature rises1342: An occluded front on a weather map is colored __________.
N a. blue line Y b. purple line N c. dashed blue line N d. alternate red and blue line1365: The same side of the Moon is always toward the Earth, but more than half of its surface has been seen due to libration. Libration in latitude occurs because __________.
Y a. the axis of rotation is tilted about 6.5° to the axis of revolution N b. the speed of revolution varies, while the rotational speed is essentially constant N c. of the rotational oscillation of the Moon with respect to its radius vector N d. of augmentation1402: As a vessel changes course to starboard, the compass card in a magnetic compass __________.
N a. first turns to starboard then counterclockwise to port N b. also turns to starboard N c. turns counterclockwise to port Y d. remains aligned with compass north1409: You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 284°T, 43 miles from you. What is the time to intercept if you make 16 knots?
N a. 2h 16m N b. 2h 22m Y c. 2h 34m N d. 2h 42m1418: 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 winds1424: Except for N-S courses, and E-W courses on the equator, a great circle track between two points, when compared to a rhumb line track between the same two points, will __________.
N a. always be nearer to the equator Y b. always be nearer to the elevated pole N c. be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere N d. be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions1432: What benefit is a weather bulletin to a mariner?
N a. It provides a legal reason to cancel a projected voyage. N b. It allows the mariner to make long term weather forecasts. N c. It is of little benefit since the weather changes frequently and rapidly. Y d. It gives the mariner time to prepare for weather changes.1474: You are on course 061°T. To check the longitude of your vessel you should observe a celestial body on which bearing?
Y a. 090° N b. 180° N c. 241° N d. 061°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, 300021529: Widely spaced isobars on a weather map indicate __________.
N a. high winds Y b. gentle breezes N c. ice, snow or frozen rain N d. probability of tornados1542: To find a magnetic course from a true course you must apply __________.
N a. magnetic anomalies (local disturbances) N b. deviation Y c. variation N d. deviation and variation1560: Under the IALA-A and B Buoyage Systems, a buoy with alternating red and white vertical stripes indicates __________.
Y a. that there is navigable water all around N b. an isolated danger exists N c. that the preferred channel is to port N d. that the preferred channel is to starboard1565: Determine the approximate geographic visibility of an object, with a height above the water of 85 feet (25.9 meters), for an observer with a height of eye of 60 feet (18.3 meters).
N a. 18.4 nm Y b. 19.9 nm N c. 20.8 nm N d. 21.5 nm1599: The time interval between successive wave crests is called the __________.
N a. trough Y b. period N c. frequency N d. epoch1663: What is the primary source of the earth's weather?
N a. The oceans N b. The moon Y c. The sun N d. The solar system1700: Generally speaking, you should expect to find low atmospheric pressure prevailing in the earth's __________.
Y a. equatorial area N b. polar regions N c. mid-latitudes N d. All of the above1952: The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?
N a. Libration in longitude Y b. Geocentric libration N c. Diurnal libration N d. Physical libration1952: The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?
N a. Libration in longitude Y b. Geocentric libration N c. Diurnal libration N d. Physical libration1956: In the North Sea area, you sight a buoy showing a quick white light with 6 flashes, followed by one long flash at 15 second intervals. Which of the four topmarks shown would be fitted to this buoy? (D030NG )
Y a. A N b. B N c. C N d. D2054: 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 lights2150: On a Mercator chart, 1 nautical mile is equal to __________.
N a. 1 minute of longitude N b. 1 degree of longitude Y c. 1 minute of latitude N d. 1 degree of latitude2160: 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 Directions2220: 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 fixed2386: The path that the Sun appears to take among the stars is the __________.
N a. zodiac N b. Tropic of Cancer in the Northern Hemisphere Y c. ecliptic N d. line of apsides2480: You are on course 277°T and take a relative bearing of a lighthouse of 045°. What is the true bearing to the lighthouse?
N a. 038° N b. 232° N c. 315° Y d. 322°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 body2579: 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 planets2609: The letter A in illustration D006NG represents the __________. (D006NG )
N a. geoidal horizon N b. celestial horizon N c. visible horizon Y d. sensible horizon2668: You are approaching a drawbridge and have sounded the request-for-opening signal. The bridge has responded with five short blasts. What reply should you sound?
N a. None; No reply is required Y b. Five short blasts N c. Two prolonged blasts N d. One prolonged, one short blast2722: The paths of intended travel between three or more points is the __________.
N a. course Y b. track N c. bearing N d. course over the ground2750: When pushing a tow and approaching barges tied off to the shore, you should __________.
N a. increase speed so you will pass faster Y b. decrease speed while passing so you won't create a suction N c. do nothing different as the barges should be tied off properly N d. move to the opposite side of the channel from the barges and increase speed2816: The length of a wave is the length __________.
N a. of the wave's crest N b. of the wave's trough N c. measured from crest to trough Y d. measured from crest to crest2838: You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix?
N a. 001° Y b. 069° N c. 209° N d. 356°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°26.0'2936: Information on search and rescue procedures and special, local communications used in Mexican waters will be found in the __________.
N a. World Port Index N b. International Code of Signals (Pub 102) Y c. Sailing Directions (Planning Guides) N d. International Aeronautical and Maritime Search and Rescue Manual2965: Which symbol represents a 10-fathom curve?
N a. ____ ____ ____ N b. ... ____ ... ____ Y c. ____ . _____ . ____ . ____ N d. ........3005: The agonic line on an isomagnetic chart indicates the __________.
N a. magnetic equator N b. magnetic longitude reference line Y c. points where there is no variation N d. points where there is no annual change in variation3074: ECDIS must give an alarm for which of the following cases?
N a. When the speed of a dangerous target exceeds a set limit Y b. When the specified limit for deviation from the planned route is exceeded N c. If the ship's ETA has changed beyond the set limit N d. None of the above3101: The typical operating range of automatic identification systems (AIS) at sea is nominally __________.
N a. 2 nm N b. 8 nm Y c. 20 nm N d. 40 nm3118: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?
N a. Call sign and IMO number Y b. Course over ground and MMSI N c. MMSI number and call sign N d. Route Plan and navigational status