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.
31: When approaching a preferred-channel buoy, the best channel is NOT indicated by the __________.
Y a. light characteristic N b. color of the uppermost band N c. shape of an unlighted buoy N d. color of the light 46: What wind reverses directions seasonally?
Y a. Monsoon winds N b. Hooked trades N c. Jet stream N d. Secondary winds 108: A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) __________.
N a. dead-reckoning position N b. estimated position Y c. fix N d. running fix 110: A millibar is a unit of __________.
N a. humidity N b. precipitation Y c. pressure N d. temperature 211: The light rhythm of Morse (A) is shown on __________.
N a. preferred-channel buoys N b. starboard- or port-side buoys N c. special marks Y d. safe water buoys 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 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 336: You are steaming eastward in the North Atlantic in an extratropical cyclonic storm and the wind is dead ahead. According to the law of Buys Ballot, the center of the low pressure lies __________.
N a. ahead of you N b. astern of you N c. to the north Y d. to the south 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 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' 635: A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a __________.
N a. poor fix Y b. good fix N c. poor signal quality N d. good signal quality 644: Your ARPA has been tracking a target and has generated the targets course and speed. The radar did not receive a target echo on its last two scans due to the weather. What should you expect under these circumstances?
Y a. The ARPA will generate data as if the target was still being tracked by radar. N b. The ARPA will give an audible and/or visual lost target alarm. N c. The ARPA will generate data based on sea return echoes from the vicinity where the target was lost. N d. The ARPA has lost all "memory" of the target and must recompute the target data. 662: What publication contains descriptions of the coast line, buoyage systems, weather conditions, port facilities, and navigation instructions for the United States and its possessions?
Y a. Coast Pilots N b. Sailing Directions N c. Port Index N d. Light List 668: You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042° at 105 miles from you. What is the course to steer at 10 knots to intercept vessel A?
N a. 063° N b. 068° N c. 073° Y d. 079° 759: At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile west of your DR. Which statement is TRUE?
N a. The set is 090°, drift 0.5 knot. Y b. The set is 270°, drift 0.25 knot. N c. The set is 270°, drift 0.5 knot. N d. The set is 270°, drift 1.0 knot. 793: The permanent magnetism of a vessel may change in strength due to __________.
N a. a collision with another vessel N b. being moored on a constant heading for a long period of time N c. being struck by lightning Y d. All of the above 814: Steam smoke will occur when __________.
Y a. extremely cold air from shore passes over warmer water N b. warm dry air from shore passes over cooler water N c. cold ocean water evaporates into warm air N d. cool rain passes through a warm air mass 818: Ocean swells originating from a typhoon can move ahead of it at speeds near __________.
N a. 10 knots N b. 20 knots N c. 30 knots Y d. 50 knots 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 933: How many degrees are there on a compass card?
Y a. 360° N b. 380° N c. 390° N d. 420° 950: Where is the dangerous semicircle located on a hurricane in the Southern Hemisphere?
Y a. To the left of the storm's track N b. To the right of the storm's track N c. In the high pressure area N d. On the south side 1026: An air mass that has moved down from Canada would most likely have the symbols __________.
N a. mPk Y b. cPk N c. cTk N d. cTw 1101: In the North Sea area, you sight a buoy showing an uninterrupted quick-flashing white light. Which of the four topmarks shown will this buoy be fitted with under the IALA Buoyage system? (D031NG )
N a. A Y b. B N c. C N d. D 1118: When entering from seaward, a buoy displaying a single-flashing red light indicates __________.
N a. a junction with the preferred channel to the left Y b. the starboard side of the channel N c. a sharp turn in the channel to the right N d. a wreck to be left on the vessel's port side 1128: In 1981, when would Jupiter and Saturn be visible in temperate latitudes for both evening and morning stars?
N a. 10 January Y b. 27 March N c. 22 June N d. 8 October 1171: A light that has a light period shorter than its dark period is described as __________.
Y a. flashing N b. pulsating N c. occulting N d. alternating 1187: Off Barnegat, NJ, with the wind coming out of the east, the wind-driven current will be flowing approximately __________.
N a. 016° N b. 106° Y c. 254° N d. 286° 1236: After the passage of a cold front the visibility_______. _
N a. does not change Y b. improves rapidly N c. improves only slightly N d. becomes poor 1238: What will be the height of tide at Three Mile Harbor Entrance, Gardiners Bay, NY, at 0700 (ZD +5) on 14 Nov 1983?
N a. 1.1 feet (0.3 meters) Y b. 1.7 feet (0.5 meters) N c. 1.9 feet (0.6 meters) N d. 2.2 feet (0.7 meters) 1255: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. extension of the low pressure ridge N b. direction of circulation and pressure gradient N c. recurvature effect Y d. the wind circulation and forward motion of the storm 1265: When reporting wind direction, you should give the direction in __________.
Y a. true degrees N b. magnetic compass degrees N c. relative degrees N d. isobaric degrees 1320: 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 __________.
Y a. steeper waves, closer together N b. smoother seas and warmer water N c. cirrus clouds N d. long swells 1343: Variation is a compass error that you __________.
N a. can correct by adjusting the compass card N b. can correct by adjusting the compensating magnets N c. can correct by changing the vessel's heading Y d. cannot correct 1356: The first indications a mariner will have of the approach of a warm front will be __________.
N a. large cumulonimbus (thunderclouds) building up Y b. high cirrus clouds gradually changing to cirrostratus and then to altostratus N c. fog caused by the warm air passing over the cooler water N d. low dark clouds accompanied by intermittent rain 1367: You want to transit Hell Gate, NY on 23 July 1983. What is the period of time around the AM (ZD +4) slack before ebb when the current will be less than 0.3 knot?
N a. 0939 to 0957 Y b. 0943 to 0953 N c. 0844 to 0852 N d. 0348 to 0356 1423: Quadrantal error in a gyrocompass has its GREATEST effect __________.
N a. in high latitudes N b. near the equator N c. on north or south headings Y d. on intercardinal headings 1444: Stratocumulus clouds are indicated by which number? (D039NG )
N a. 1 N b. 4 Y c. 6 N d. 7 1554: A slow rise in the barometric pressure forecasts __________.
N a. rainy weather for the next 48 hours N b. high seas Y c. improving weather conditions N d. deteriorating weather conditions 1646: Which picture in illustration D034NG shows a flashing light? (D034NG )
N a. A N b. B Y c. C N d. D 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 1691: Which of the following is associated with consistently high barometric pressure?
Y a. The horse latitudes N b. The doldrums N c. The prevailing westerlies N d. The trade winds 1800: In order to insure that a RACON signal is displayed on the radar, you should __________.
N a. increase the brilliance of the PPI scope Y b. turn off the interference controls on the radar N c. use the maximum available range setting N d. increase the radar signal output 2092: Descending boats, while awaiting their turn to enter a lock, shall NOT block traffic from the lock. They shall be above the lock by at LEAST __________.
N a. 100 feet N b. 200 feet N c. 300 feet Y d. 400 feet 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 2145: What lights would you see on the Illinois water way 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 red N b. Red over blue N c. Green over amber (yellow) Y d. Red over amber (yellow) 2171: Diagram number D037NG represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at B if the lock walls and piers are not awash?
N a. One amber light N b. One red light N c. Two red lights Y d. Three red lights 2240: If you observe a buoy off station you should __________.
N a. fill out and mail CG Form 2692 to the nearest Coast Guard office N b. appear in person at the nearest Coast Guard office N c. notify Coast Guard Headquarters in Washington, DC Y d. immediately contact the nearest Coast Guard office by radiotelephone 2272: Mars will not be visible __________.
N a. at elongation angles near 180° N b. from quadrature to opposition Y c. at conjunction N d. at opposition 2444: What is the equivalent of 0°48' in time units?
N a. 2 min. 12 sec. N b. 2 min. 42 sec. N c. 3 min. 02 sec. Y d. 3 min. 12 sec. 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 2576: What is the equivalent of 8 min. 56 sec. in arc units?
N a. 0°28' N b. 0°46' N c. 1°12' Y d. 2°14' 2584: You must construct a Mercator plotting sheet on a piece of paper measuring 30" by 36". The area includes latitude 30°45'S to 37°15'S and longitude 004°00'E to 005°00'W. Allow a one inch neat line on all sides. What is the maximum distance between each degree of longitude that will permit the area of the plotting sheet to be drawn within the stated limitation?
N a. 3.09 inches N b. 3.22 inches N c. 3.41 inches Y d. 3.58 inches 2589: Under the IALA cardinal system, a mark with a quick white light showing 6 flashes followed by one long flash indicates that the safest water is on the __________.
N a. north side of the mark N b. west side of the mark N c. east side of the mark Y d. south side of the mark 2610: A line on the Earth parallel to the equator is a __________.
N a. gnomonic curve Y b. small circle N c. meridian N d. great circle 2700: In the horizon system of coordinates what is equivalent to the meridian angle of the celestial equator system?
Y a. Azimuth angle N b. Zenith distance N c. Colatitude N d. Altitude 2791: The letter B in illustration D006NG represents the __________.
N a. sensible horizon Y b. geoidal horizon N c. celestial horizon N d. visible horizon 2803: Some locations maintain a zone time of -13. What are the Greenwich time and date if the zone time and date are 0152, 10 January?
Y a. 1252, 9 January N b. 1452, 9 January N c. 0052, 11 January N d. 1452, 11 January 2859: The buoy indicated by the letter C in illustration D044NG is a __________.
N a. nun N b. can N c. spar Y d. pillar 2931: The vertical distance from the tidal datum to the level of the water is the __________.
N a. range of tide Y b. height of tide N c. actual water depth N d. charted depth 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