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.
9: When displayed under a single-span fixed bridge, red lights indicate __________.
Y a. the channel boundaries N b. that vessels must stop N c. the bridge is about to open N d. that traffic is approaching from the other side 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 51: In the U.S. Aids to Navigation System, red and green horizontally-banded buoys mark __________.
N a. channels for shallow draft vessels N b. general anchorage areas N c. fishing grounds Y d. junctions or bifurcations 94: When using a recording depth finder in the open ocean, what phenomena is most likely to produce a continuous trace that may not be from the actual ocean bottom?
Y a. Echoes from a deep scattering layer N b. Echoes from schools of fish N c. Multiple returns reflected from the bottom to the surface and to the bottom again N d. Poor placement of the transducer on the hull 125: The GMT is 0445 and your zone description is +1. Your zone time is __________.
N a. 0445 Y b. 0345 N c. 0545 N d. 1545 126: 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 area 358: What will be the set of the rotary current at Nantucket Shoals at 1245 (ZD +5) 14 January 1983?
N a. 015° Y b. 125° N c. 162° N d. 225° 424: 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 vicinity 454: On what does the operation of an aneroid barometer depend?
Y a. Thin, metal, air tight cell N b. Curved tube containing alcohol N c. Column of mercury supported by atmospheric pressure N d. Expansion of mercury in a closed tube 524: An anemometer on a moving vessel measures __________.
Y a. apparent wind speed only N b. true wind speed and true wind direction N c. true wind speed only N d. apparent wind speed and true wind direction 529: In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream, and is called a __________.
N a. seiche Y b. bore N c. boundary wave N d. surge 564: A hygrometer is a device used for determining __________.
N a. the absolute temperature N b. atmospheric pressure N c. wind velocity Y d. relative humidity 586: The approximate distance to a storm center can be determined by noting the hourly rate of fall of the barometer. If the rate of fall is 0.08 - 0.12 inches, what is the approximate distance to the storm center?
N a. 50 to 80 miles Y b. 80 to 100 miles N c. 100 to 150 miles N d. 150 to 250 miles 590: On 16 January 1981, you take a sight of a star. The sextant altitude (hs) is 4°33.0'. The temperature is -10°C, and the barometer reads 992 millibars. The height of eye is 42 feet. The index error is 1.9' off the arc. What is the observed altitude (Ho)?
N a. 4°10.2' N b. 4°14.3' Y c. 4°17.0' N d. 4°24.1' 593: Radar makes the most accurate determination of the __________.
N a. direction of a target Y b. distance to a target N c. size of a target N d. shape of a target 689: What is the index error of sextant C? (D050NG )
Y a. 0'20" on the arc N b. 1'00" on the arc N c. 2'00" on the arc N d. 5'10" on the arc 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 708: Which statement about Radio Navigational Warning Broadcasts is TRUE?
N a. Radio navigational warnings are valid for 10 days, unless cancelled earlier. N b. NAVAREA warnings cover coastal areas only, while HYDROLANTS or HYDROPACS cover entire ocean areas. Y c. Radio navigational warnings issued by NGA (NIMA) are published in the Daily Memorandum and the Notice to Mariners. N d. HYDROLANTS and HYDROPACS cover the same geographical areas as NAVAREA warnings, but are for the use of military vessels only. 734: You are approaching Chatham Strait from the south in foggy weather. You have Coronation Island and Hazy Islands on the radar. Suddenly the radar malfunctions. You then resort to using whistle echoes to determine your distance off Coronation Island. Your stopwatch reads 16.3 seconds for the echo to be heard. How far are you off Coronation Island?
N a. 1.0 mile Y b. 1.5 miles N c. 2.0 miles N d. 2.5 miles 749: 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° 777: With respect to a reversing current, slack water occurs when there is __________.
Y a. little or no horizontal motion of the water N b. little or no vertical motion of the water N c. a weak ebb or flood current N d. when winds cause water to back up in a river mouth 838: A navigator fixing a vessel's position by radar __________.
N a. must use information from targets forward of the beam N b. should never use radar bearings N c. should only use radar bearings when the range exceeds the distance to the horizon Y d. can use radar information from one object to fix the position 841: Under the IALA-A Buoyage system, a buoy marking the port hand of the channel when approaching from seaward may NOT have a __________.
N a. red light Y b. conical shape N c. group-flashing light N d. square topmark 844: A cloud of marked vertical development (often anvil-shaped) would be classified as __________.
N a. cirrus N b. cirrocumulus N c. altocumulus Y d. cumulonimbus 875: Sidereal hour angle is always __________.
N a. measured westward from the hour circle containing the first point of Aries N b. measured from the point on the celestial sphere occupied by the Sun at the vernal equinox N c. subtracted from the LHA of the star to obtain the LHA of Aries Y d. All of the above 899: A latitude line will be obtained by observing a body __________.
N a. on the prime vertical N b. on the celestial horizon Y c. at lower transit N d. on the Greenwich meridian 936: A cyclone in its final stage of development is called a(n) __________.
N a. tornado N b. anticyclone Y c. occluded cyclone or occluded front N d. polar cyclone 941: While preparing to enter a Brazilian port, you see ahead a red and green horizontally-striped buoy. The upper band is red. What action should you take?
N a. Alter course to leave the buoy to port. Y b. Alter course to leave the buoy to starboard. N c. Pass the buoy close aboard on either side. N d. Pass the buoy well clear on either side. 958: You are preparing a weather report form. Twenty-five percent of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 062° relative at 13 knots. You are on course 238°T at 22 knots. How should you encode group Nddff? (D041NG )
Y a. 20220 N b. 20613 N c. 30219 N d. 32413 967: On an Atlantic Ocean voyage from New York to Durban, South Africa, you should expect the Agulhas Current to present a strong __________.
N a. offshore set N b. onshore set Y c. head current N d. fair or following current 1062: What is the approximate geographic range of Horton Point Light, NY, if your height of eye is 40 feet (12.2 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS" .
N a. 18.8 nm Y b. 19.3 nm N c. 20.3 nm N d. 24.8 nm 1062: What is the approximate geographic range of Horton Point Light, NY, if your height of eye is 40 feet (12.2 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS" .
N a. 18.8 nm Y b. 19.3 nm N c. 20.3 nm N d. 24.8 nm 1067: The two most effective generating forces of surface ocean currents are __________.
N a. temperature and salinity differences in the water Y b. wind and density differences in the water N c. water depth and underwater topography N d. rotation of the Earth and continental interference 1116: When a cold air mass and a warm air mass meet, and there is no horizontal motion of either air mass, it is called a(n) __________.
N a. cold front N b. occluded front Y c. stationary front N d. warm front 1262: A safe water daymark has what shape?
N a. Triangular N b. Diamond N c. Circular Y d. Octagonal 1274: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a sandstorm? (D042NG )
N a. H Y b. O N c. P N d. K 1596: You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which of the following is TRUE?
Y a. You should leave the buoy on your port hand. N b. This buoy marks the end of the ICW in that geographic area. N c. The yellow is retroreflective material used to assist in sighting the buoy at night. N d. The yellow square is in error and it should be a yellow triangle. 1676: Lighted information markers show __________.
N a. green lights Y b. white lights N c. yellow lights N d. red lights 1717: A tropical storm is a tropical cyclone that generates winds of __________.
N a. between 20 and 33 knots Y b. between 34 and 63 knots N c. over 63 knots N d. None of the above 1727: What enables you to estimate the bearing of a storm's center?
Y a. Buys Ballot's Law N b. An educated guess N c. Pascal's Law N d. The left-hand rule 1779: The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 14 miles and your height of eye is 20 feet, at which approximate distance will you sight the light?
N a. 7.5 miles Y b. 11.2 miles N c. 14.0 miles N d. 18.1 miles 1797: A phenomenon where the atmospheric pressure is higher than that of other surrounding regions is called __________.
Y a. a high pressure area N b. a low front or an occluded front N c. the "trade winds" N d. the "doldrums" 1804: Magnetic information on a chart may be __________.
N a. found in the center(s) of the compass rose(s) N b. indicated by isogonic lines N c. found in a note on the chart Y d. All of the above 1869: The illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter B in the illustration? (D036NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No light 1919: The nadir is the point on the celestial sphere that is __________.
N a. 90° away from the zenith N b. over Greenwich N c. on the western horizon Y d. directly below the observer 1934: The great circle of the celestial sphere that passes through the zenith, nadir, and the eastern point of the horizon is the __________.
N a. principal vertical N b. hour circle N c. celestial meridian Y d. prime vertical 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° 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 2142: Which lights would you see on the Illinois waterway when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
N a. Green over amber (yellow) Y b. Red over amber (yellow) N c. Red over blue N d. Green over red 2192: Off Fire Island, NY, with winds from the southwest, the average wind-driven current flows in a direction of __________.
N a. 256° N b. 170° Y c. 076° N d. 014° 2220: 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 fixed 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 2364: The immediate surroundings of what constellation contain the most first magnitude stars?
N a. Libra N b. Cassiopeia N c. Pegasus Y d. Orion 2380: The navigation regulations applicable to a U.S. inland waterway can be found in the __________.
N a. Notices to Mariners N b. Channel Reports N c. Sailing Directions Y d. Coast Pilots 2430: You are on course 222°T and take a relative bearing of a lighthouse of 025°. What is the true bearing to the lighthouse?
N a. 197° Y b. 247° N c. 315° N d. 335° 2514: Sidereal time is NOT used __________.
N a. as the basis for star charts N b. to enter a star finder N c. in sight reduction using Pub 249 Y d. in sight reductions of planet observations 2525: Daylight savings time is a form of zone time that adopts the time __________.
N a. two zones to the west N b. two zones to the east N c. one zone to the west Y d. one zone to the east 2709: Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which of the topmarks shown? (D046NG )
N a. A N b. B N c. C Y d. D 3010: A white buoy with a blue band is __________.
N a. an isolated danger mark N b. a hydrographic data collection buoy Y c. a mooring buoy N d. marking a restricted area 3072: ECDIS must give an alarm for which of the following cases?
N a. When the specified limit for deviation from the planned route is exceeded N b. If the ship, within a specified time set by the watch officer, is going to cross a safety contour N c. If the ship, within a specified time set by the watch officer, is going to cross the boundary of a prohibited area Y d. All of the above