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 98: A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) __________.
N a. dead reckoning position Y b. estimated position N c. fix N d. None of the above 110: A millibar is a unit of __________.
N a. humidity N b. precipitation Y c. pressure N d. temperature 163: How many fixed objects are needed to plot a running fix?
N a. None Y b. One N c. Two N d. Three 248: What is the index error of sextant A in illustration D050NG? (D050NG )
N a. 0° 10' off the arc N b. 0° 10' on the arc N c. 3° 00' off the arc Y d. 4° 20' off the arc 273: Loran-C is which type of navigation system?
Y a. Hyperbolic, long-range navigation system N b. Short-range electronic N c. Long-range, high frequency navigation system N d. Long-range, with a frequency of 1950 kHz 312: The depth of water on a chart is indicated as 23 meters. This is equal to __________.
N a. 11.5 fathoms Y b. 12.6 fathoms N c. 69.0 feet N d. 78.6 feet 485: A phase correction is applied to observations of __________.
N a. the Sun N b. stars Y c. planets N d. All of the above 491: A special purpose buoy shall be __________.
N a. lighted with a white light N b. striped black and red N c. lighted with a red light Y d. yellow 572: You wish to measure the distance on a Mercator chart between a point in latitude 43°30'N and a point in latitude 40°30'N. To measure 30 miles at a time, you should set the points of the dividers at __________.
N a. 41°30' and 42°00' Y b. 41°45' and 42°15' N c. 42°00' and 42°30' N d. 42°15' and 42°45' 641: Buoys which mark isolated dangers are painted with alternating _____________ .
Y a. red and black bands N b. green and black bands N c. red and white stripes N d. green and white bands 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 669: It is desirable that a vessel encountering hurricane or typhoon conditions sends weather reports to the closest meteorological service at least every __________.
N a. hour Y b. 3 hours N c. 6 hours N d. 8 hours 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° 781: The IALA Buoyage Systems do NOT apply to __________.
N a. the sides and centerlines of navigable channels N b. natural dangers and other obstructions, such as wrecks Y c. lighthouses and lightships N d. areas in which navigation may be subject to regulation 784: Variation is the angular measurement between __________.
N a. compass north and magnetic north N b. compass north and true north Y c. magnetic meridian and the geographic meridian N d. your vessel's heading and the magnetic meridian 810: The position labeled B is a(n) __________. (D051NG )
N a. fix N b. running fix Y c. estimated position N d. dead reckoning position 823: The greatest directive force is exerted on the magnetic compass when the __________.
N a. needles are nearly in line with the meridian N b. vessel is near the magnetic poles N c. variation is near zero Y d. vessel is near the magnetic equator 824: An "atoll cloud" forming over an island due to heating of the land during the daytime would be which type?
N a. Cirrus Y b. Cumulus N c. Stratus N d. Nimbus 848: It is unlawful to approach within how many yards of a northern right whale?
N a. 200 N b. 300 N c. 400 Y d. 500 901: 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 1071: A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the __________.
Y a. north side of the mark N b. west side of the mark N c. east side of the mark N d. south side of the mark 1075: The expression "first magnitude" is usually used to refer only to bodies of magnitude __________.
Y a. 1.5 and greater N b. 1.25 and greater N c. 1.0 and greater N d. 0.5 and greater 1075: The expression "first magnitude" is usually used to refer only to bodies of magnitude __________.
Y a. 1.5 and greater N b. 1.25 and greater N c. 1.0 and greater N d. 0.5 and greater 1084: As the temperature of an air mass decreases, the __________.
N a. absolute humidity decreases Y b. relative humidity increases N c. specific humidity decreases N d. dew point rises 1195: A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) __________.
N a. dead reckoning position N b. fix Y c. estimated position N d. None of the above 1307: What will be the velocity of the tidal current southwest of Hunts Point, NY, at 0932 EST (ZD +5) on 16 March 1983?
N a. 0.9 knot Y b. 1.5 knots N c. 1.8 knots N d. 2.3 knots 1319: The Sailing Directions (Planning Guide) contain information on all of the following EXCEPT __________.
Y a. coastal features N b. ocean basin environment N c. ocean routes N d. military operating areas 1333: If a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE?
Y a. Compass error and variation are equal. N b. Compass north will be true north. N c. Variation will equal deviation. N d. There will be no compass error. 1499: You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?
Y a. Starting with a dash and extending radially outward from the target N b. As a broken line from center of PPI to the target N c. Starting with a dot and extending radially inward from the target N d. Starting with a dash and extending to the right of the target 1572: Generally speaking, in the Northern Hemisphere, when winds are blowing from between SE and SW the barometric reading __________.
N a. makes no change at all Y b. is somewhat lower than it would be for winds from a northern quadrant N c. is uncertain and may fluctuate by increasing and decreasing N d. is somewhat higher than it would be for winds from the northern quadrant 1606: Aids to navigation marking the intracoastal waterway can be identified by __________.
N a. the letters ICW after the aid's number or letter Y b. yellow stripes, squares, or triangles marked on them N c. white retroreflective material N d. the light characteristic and color for lighted aids 1629: Air temperature varies with __________.
N a. the altitude above sea level N b. the season of the year N c. the latitude or distance from the equator Y d. All of the above 1643: Cumulus clouds that have undergone vertical development and have become cumulonimbus in form, indicate __________.
N a. clearing weather N b. that a warm front has passed Y c. probable thunderstorm activity N d. an approaching hurricane or typhoon 1802: What is the major advantage of high altitude observations?
N a. Errors due to unusual parallax are eliminated. Y b. The same body can be used for a fix from observations separated by several minutes. N c. The declination is the only information needed from the almanac. N d. The semidiameter correction of the sextant altitude is eliminated. 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 1984: When a dual purpose marking is used, the mariner following the Intracoastal Waterway should be guided by the __________.
N a. color of the aid N b. shape of the aid N c. color of the top band Y d. shape of the yellow mark 2061: Fog is likely to occur when there is little difference between the dew point and the __________.
N a. relative humidity Y b. air temperature N c. barometric pressure N d. absolute humidity 2088: Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained by consulting the __________.
N a. Sailing Directions N b. Light List Vol. V N c. U.S. Coast Pilot Y d. Broadcast Notice to Mariners 2114: Vessels regularly navigating rivers above Cairo, Illinois, shall at all times have on board a copy of __________.
N a. Sailing Directions N b. Nautical Almanac for the year N c. U.S. Coast Pilot Y d. U.S. Army Corps of Engineers Regulations (Blue Book) 2121: In plotting a running fix, how many fixed objects are needed to take your lines of position from?
N a. Three N b. Two Y c. One N d. None 2174: By convention, the Earth's north magnetic pole is colored __________.
N a. red N b. white Y c. blue N d. black 2207: Yesterday your chronometer read 11h 59m 58s at the 1200 GMT time tick. Today your chronometer reads 12h 00m 00s at the 1200 time tick. What is the chronometer rate?
N a. Nil N b. 12h Y c. +2s N d. -2s 2209: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic west but the compass reads 266°. You should now adjust the compass until it reads __________.
Y a. 268° N b. 270° N c. 274° N d. Do not adjust the compass, just record the error. 2229: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?
Y a. If the red ends are to port the athwartships magnets should be raised. N b. If the blue ends are to port the athwartships magnets should be raised. N c. If the red ends are forward the fore-and-aft magnets should be lowered. N d. If the blue ends are forward the fore-and-aft magnets should be raised. 2269: One of the factors which affects the circulation of ocean currents is __________.
N a. humidity Y b. varying densities of water N c. vessel traffic N d. the jet stream 2270: The lubber's line of a magnetic compass __________.
N a. always shows true north direction Y b. indicates the vessel's heading N c. is always parallel to the vessel's transom N d. is located on the compass card 2481: The letter D as shown represents the __________. (D006NG )
N a. celestial horizon N b. sensible horizon Y c. geometrical horizon N d. visible horizon 2508: Normal pool elevation is the height in feet of the section of river above a dam. This height is measured from __________.
N a. low steel on the Huey P. Long Bridge Y b. mean sea level N c. the local water table N d. the minimum dam control level 2527: In the doldrums you can expect __________.
N a. steady, constant winds Y b. frequent rain showers and thunderstorms N c. steep pressure gradients N d. low relative humidity 2587: Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN?
Y a. C 166°T, Sp 24 knots N b. C 013°T, Sp 7 knots N c. C 291°T, Sp 25 knots N d. C 112°T, Sp 4 knots 2626: What information is found in the chart title?
N a. Date of the first edition N b. Date of the edition and, if applicable, the revision Y c. Information on the sounding datum N d. Information on which IALA buoyage system applies 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) 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 2730: When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind, the approach is best made __________.
Y a. with bow out, stern in N b. with bow in, stern out N c. parallel to the dock, as close in as possible N d. parallel to the dock, as far out as possible 2820: A towboat is pushing barges ahead at a dangerously fast speed when __________.
N a. the towboat vibrates when backing down N b. the roostertail exceeds the height of the main deck N c. a strain is placed on the face wires Y d. water comes over the foredeck of the lead barges 2849: You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix?
Y a. 000° N b. 066° N c. 112° N d. 271° 2878: Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN?
N a. C 356°T, Sp 5 knots N b. C 099°T, Sp 17 knots Y c. C 192°T, Sp 23 knots N d. C 278°T, Sp 6 knots 3038: In low latitudes, the low(s) of the diurnal variation of pressure occur(s) at __________.
N a. noon N b. noon and midnight N c. 1000 and 2200 Y d. 0400 and 1600 3125: Which of the following statements is TRUE regarding automatic identification systems (AIS)?
N a. AIS is designed to replace ARPA, maneuvering boards, and visual bearings as a means to ascertain the risk of collision. Y b. AIS provides near real-time information regarding another vessel's speed over ground and heading regardless of visibility. N c. AIS will not provide information on another vessel if that vessel is indistinguishable in radar sea clutter. N d. AIS can be relied upon as the sole means to determine course changes due to other AIS equipped traffic.