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.
2: On an isomagnetic chart, the line of zero variation is the __________.
N a. zero variation line N b. isogonic line N c. variation line Y d. agonic line 26: Wind direction may be determined by observing all of the following EXCEPT __________.
N a. low clouds N b. waves N c. whitecaps Y d. swells 253: Loran-C is which type of system?
N a. Reflected electron N b. Electrical radiation N c. Quarterpoint electrical navigation Y d. Hyperbolic radio navigation 375: If the Sun's observed altitude is 47°50', the zenith distance is __________.
Y a. 42°10' N b. 42°50' N c. 47°50' N d. 132°10' 420: You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown. The range continues to open. What action should you take? (D047NG )
Y a. Alter course to the left until the range closes then steer to the left of 306°T. N b. Maintain course as it is normal for the range to open as you get close. N c. Alter course to the left to close the range, then alter course to 309°T. N d. Alter course to the right to 309°T or more to bring the range in line. 456: Which condition exists in the eye of a hurricane?
N a. Wind rapidly changing direction N b. A temperature much lower than that outside the eye N c. Towering cumulonimbus clouds Y d. An extremely low barometric pressure 469: Where are the prevailing westerlies of the Southern Hemisphere located?
N a. Between the Equator and 10° latitude N b. Between 10° and 20° latitude Y c. Between 30° and 60° latitude N d. Between 60° and 90° latitude 530: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
N a. the port side of the channel N b. the position of underwater cables Y c. safe water N d. a hazard to navigation 557: Your vessel has a draft of 23 feet. On 23 June 1983 you wish to pass over a temporary obstruction near Beaufort, SC, that has a charted depth of 22 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 1600 DST (ZD +4) that this passage can be made?
Y a. 1750 N b. 1815 N c. 1855 N d. 1944 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 612: Which statement is TRUE concerning a Mercator projection?
N a. Degrees of longitude decrease in length as latitude increases. Y b. The length of the meridians is increased to provide for equal expansion in all directions. N c. The mileage between the meridians is increased as the latitude increases. N d. All of the above 654: Your ARPA has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the ground. What should you expect under these circumstances?
N a. The generated CPA will be less than the actual CPA. N b. The generated TCPA will be later than the actual TCPA. N c. The range of initial target acquisition will be less than normal. Y d. The targets true course vector will be in error. 729: The doldrums are characterized by __________.
N a. steady, light to moderate winds Y b. frequent calms N c. clear skies N d. low humidity 774: Variation is not constant; it is different with every change in __________.
N a. speed N b. vessel heading Y c. geographical location N d. cargo 833: The magnetic compass magnets are acted on by the horizontal component of the Earth's total magnetic force. This magnetic force is GREATEST at the __________.
N a. north magnetic pole N b. south magnetic pole N c. magnetic prime vertical meridian Y d. magnetic equator 849: The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 30 feet (9.1 meters) and the visibility is 0.5 mile. At what approximate range will you first sight the light?
N a. 0.5 mile Y b. 1.4 miles N c. 5.2 miles N d. 12.0 miles 867: Which ocean current is "warm" based on the latitude in which it originates and on the effect it has on climate?
Y a. Kuroshio Current N b. Benguela Current N c. Peru Current N d. California Current 871: Under the IALA-A Buoyage System, a buoy marking the starboard side of the channel when approaching from seaward must have a(n) __________.
N a. pillar shape Y b. green color N c. square topmark N d. even number 881: Under the IALA-A Buoyage System, when entering from seaward, a buoy indicating the preferred channel is to starboard may have a __________.
N a. green light N b. long-flashing light characteristic Y c. square topmark N d. conical shape 966: Most high pressure areas in the United States are accompanied by __________.
N a. precipitation Y b. clear, cool weather N c. humid, sticky weather N d. cool fogs 981: The characteristic of a lighted cardinal mark may be __________.
Y a. very quick flashing N b. flashing N c. fixed N d. occulting 998: The navigable semicircle of a tropical storm in the South Indian Ocean is located on which side of the storm's track?
N a. Rear N b. Front N c. Left Y d. Right 1005: The refraction correction table given in the Nautical Almanac is based on a standard or average atmospheric density with a temperature of 50°F (10°C) and atmospheric pressure of __________.
N a. 29.72 inches (1006 millibars) Y b. 29.83 inches (1010 millibars) N c. 29.89 inches (1012 millibars) N d. 29.93 inches (1014 millibars) 1150: You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing?
Y a. 312° N b. 000° N c. 090° N d. 222° 1165: Which statement concerning the chartlet is TRUE? (Soundings and heights are in meters) (D010NG )
N a. Maury lightship is visible for 17 miles. Y b. There is a dangerous eddy southeast of Beito Island. N c. There is a 12-meter deep west of Beito Island and inside the 5-meter line. N d. The bottom to the south-southeast of the lightship is soft coral. 1196: In the Northern Hemisphere, gusty winds shifting clockwise, a rapid drop in temperature, thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies, indicate the passage of a(n) __________.
N a. warm front N b. tropical cyclone N c. anticyclone Y d. cold front 1239: While taking weather observations, you determine that the wind is blowing from the northeast. You would record the wind direction in the weather log as __________.
Y a. 045° N b. 090° N c. 135° N d. 225° 1296: After a cold front passes the barometric pressure usually __________.
N a. fluctuates N b. remains the same N c. remains the same, with clouds forming rapidly Y d. rises, often quite rapidly, with clearing skies 1338: Which type of cloud is indicated by the number 6? (D039NG )
N a. Altocumulus Y b. Stratocumulus N c. Altostratus N d. Cirrus 1364: The Sailing Directions are published in the Enroute format and the __________.
N a. Coastal editions N b. World Port Index N c. Pilot format Y d. Planning Guide 1520: The diurnal inequality of the tides is caused by __________.
Y a. the declination of the Moon N b. changing weather conditions N c. the Moon being at apogee N d. the Moon being at perigee 1582: Sextant C in illustration D043NG reads __________. (D043NG )
N a. 30°45.9' N b. 29°56.0' N c. 29°52.0' Y d. 29°47.5' 1592: A white buoy marked with an orange rectangle indicates __________.
N a. an anchorage N b. a fish net area N c. mid-channel Y d. general information 1608: When using a buoy as an aid to navigation which of the following should be considered?
N a. If the light is flashing the buoy should be considered to be in the charted location. Y b. The buoy may not be in the charted position. N c. The buoy should be considered to be in the charted position if it has been freshly painted. N d. The buoy should be considered to always be in the charted position. 1625: A sling psychrometer is used to measure __________.
N a. seawater temperature N b. engine temperature Y c. dry bulb and wet bulb temperatures N d. barometric pressure 1752: What is the major limitation in using the Sight Reduction Tables for Air Navigation Volume I (Pub. No. 249) for star sights?
N a. More accuracy is needed for celestial observations on board ship than what is tabulated. N b. Sights must be made at even time increments to benefit from the tables. Y c. Only certain stars are included and sights must be limited to those stars. N d. Only first magnitude stars are tabulated. 1762: In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.
N a. adding 30° of arc to the sight Y b. using a dip correction based on the height of eye above the ice N c. doubling the semidiameter correction N d. using a dip correction from table 22 in Bowditch Vol. II 1778: Illustration D037NG represents a movable dam. If the wickets are down and there are open weirs due to high water, what light(s) will be shown at A if the lock walls and piers are not awash? (D037NG )
Y a. One red light N b. Two red lights N c. Three red lights N d. One green light 1840: A vessel heading NW is on a course of __________.
N a. 274.5° N b. 292.5° Y c. 315.0° N d. 337.5° 1841: The letter A as shown represents the __________. (D006NG )
Y a. sensible horizon N b. geoidal horizon N c. visible horizon N d. celestial horizon 1852: When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________.
Y a. 90° - Ho N b. 180° - GHA N c. GHA - LHA N d. z - d 2200: Cloud formations are minimal when the __________.
Y a. surface temperature and temperature aloft are equal N b. surface temperature and temperature aloft differ greatly N c. barometric pressure is very low N d. relative humidity is very high 2224: By convention, the north seeking ends of a compass' magnets are colored __________.
N a. black N b. blue Y c. red N d. white 2330: You are heading in a northerly direction when you come across an easterly current. Your vessel will __________.
Y a. be pushed to starboard N b. be pushed to port N c. decrease in engine speed N d. remain on course 2366: The major problem with Moon sights is the __________.
N a. rapid changes in GHA and declination introduce errors into the calculations Y b. lack of a well defined limb during certain phases and positions in the sky N c. approximations used in the solution caused by the variable horizontal parallax N d. augmentation effect caused by the relatively short distance to the Moon 2429: The lock chamber is 600 feet X 110 feet. Your towboat is 150 feet X 35 feet. Which of these tows will require a double lockage?
N a. A set-over single N b. 4 standard barges abreast next to your boat's head and 3 jumbo abreast in the lead N c. 6 jumbo (3 abreast and 2 long) with a standard on each side of your boat Y d. 9 jumbo barges 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 2602: The lunar day is also known as the __________.
N a. lunitidal interval N b. vulgar establishment of the port N c. nodal day Y d. tidal day 2690: Right ascension is primarily used by the navigator for __________.
N a. calculating amplitudes N b. calculating great circle sailings by the Ageton method N c. entering the Air Navigation Tables (Selected Stars) Pub 249 Y d. plotting on star finders 2692: The dividing meridian between zone descriptions -2 and -3 is __________.
N a. 15°30'E N b. 30°00'E Y c. 37°30'E N d. 45°00'E 2708: You are approaching a drawbridge and have sounded the proper whistle signal requesting it to open. You hear a signal of one prolonged and one short blast from the bridge. Which action should you take?
N a. Anchor or use an alternate route because the bridge is out of service for an extended period of time. N b. Approach to a point not closer than 400 yards (360 meters) from the bridge and await further signals. N c. Hold in the channel as the bridge will open within 15 minutes. Y d. Approach under full control to pass through the bridge. 2842: The draw span of a floating drawbridge may be marked with __________.
N a. two white lights Y b. a yellow diamond N c. flashing blue lights N d. three red lights on each side of the draw 2870: Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.
N a. spring, around late evening N b. spring, around early evening Y c. fall, around early morning N d. fall, around midday 2886: On mid-ocean waters, the height of a wind-generated wave is not affected by the __________.
Y a. water depth exceeding 100 feet N b. fetch N c. wind's velocity N d. duration of the wind 2949: On 13 November 1981 you observe a back sight of the upper limb of the Sun. The sextant altitude (hs) is 109°26.3'. The height of eye is 66 feet, and the index error is 2.0' on the arc. What is the observed altitude (HO)?
N a. 70°56.6' N b. 70°38.0' Y c. 70°27.2' N d. 70°23.2' 2950: On an Army Corps of Engineers navigation map, each mile A.H.P. on the Lower Mississippi River is marked by a __________.
N a. dashed red line N b. number showing mileage N c. navigation light Y d. red circle 2956: On 23 August 1981 you observe a back sight of the upper limb of the Sun. The sextant altitude (hs) is 116°42.8'. The height of eye is 56 feet and the index error is 2.0' off the arc. What is the observed altitude (Ho)?
N a. 63°42.0' N b. 63°38.0' N c. 63°19.4' Y d. 63°06.2' 2958: Drawbridges equipped with radiotelephones display a __________.
N a. day signal of a yellow diamond marked with the call sign N b. white sign with the number 16 and the call sign on it N c. black and white diamond marked with RT 16 Y d. blue and white sign showing the radio's channels 3021: Which information is found in the chart title?
N a. Chart number Y b. Chart sounding datum N c. Revision and edition date N d. Variation information 3094: ECDIS must have the capability to preserve the record of the track for the previous __________.
Y a. 12 hours N b. 24 hours N c. 48 hours N d. 72 hours