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.
6: Wind velocity varies __________.
N a. directly with the temperature of the air mass Y b. directly with the pressure gradient N c. inversely with the barometric pressure N d. inversely with the absolute humidity 23: If Loran-C signals become unsynchronized, the receiver operator is warned because __________.
Y a. signals begin to blink N b. signals begin to shift N c. stations discontinue transmission N d. stations transmit grass 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 130: The distance between the surface of the water and the tidal datum is the __________.
N a. range of tide Y b. height of tide N c. charted depth N d. actual water depth 162: A chart with a scale of 1:80,000 would fall into the category of a __________.
N a. sailing chart N b. general chart Y c. coastal chart N d. harbor chart 199: Civil twilight occurs at 0558 zone time on 30 December 1981. Your DR position at that time is LAT 15°02'N, LONG 46°02'W. Which statement concerning the planets available for morning sights is TRUE?
Y a. At 0558, Mars can be used for an ex-meridian observation. N b. Venus, Jupiter, and Mars sights will yield a good three line fix. N c. Saturn will be near the prime vertical. N d. Venus will be visible low in the western sky. 351: Which buoy may be odd numbered?
N a. A spherical buoy Y b. An unlighted can buoy N c. A red buoy N d. A yellow buoy 382: Which would you consult for information about the general current circulation in the North Atlantic Ocean?
Y a. Pilot chart N b. Coast Pilot N c. Current Table N d. Climatological Atlas 409: On November 1st the zone time is 1700 EST (ZD +5) in LONG 75°W. What is the corresponding zone time and date in LONG 135°E?
Y a. 0700, November 2nd N b. 0700, November 1st N c. 2200, November 1st N d. 2200, October 31st 475: A correction for augmentation is included in the Nautical Almanac corrections for __________.
N a. the Sun Y b. the Moon N c. Venus N d. None of the above 533: You are using a radar in which your own ship is shown at the center, and the heading flash always points to 0°. If bearings are measured in relation to the flash, what type of bearings are produced?
Y a. Relative N b. True N c. Compass N d. Magnetic 553: The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?
N a. 052° N b. 056° Y c. 059° N d. 060° 746: Lines drawn through points on the Earth having the same atmospheric pressure are known as __________.
N a. isothermal N b. millibars Y c. isobars N d. seismics 770: You are plotting a running fix in an area where there is a determinable current. How should this current be treated in determining the position?
Y a. The course and speed made good should be determined and used to advance the LOP. N b. The drift should be added to the ship's speed. N c. The current should be ignored. N d. The set should be applied to the second bearing. 796: Cyclones tend to move __________.
N a. perpendicular to the isobars in their warm sectors Y b. parallel to the isobars in their warm sectors N c. parallel to the line of the cold front N d. perpendicular to the line of the cold front 895: The ecliptic is __________.
Y a. the path the Sun appears to take among the stars N b. the path the Earth appears to take among the stars N c. a diagram of the zodiac N d. a great circle on a gnomonic chart 930: Which statement about radio navigational warnings is TRUE?
Y a. The topics for warnings included in HYDROLANTS, HYDROPACS, and NAVAREA warnings are the same. N b. NAVAREA warnings concern only coastal navigation and inland navigation in large bays or sounds such as Puget Sound. N c. The United States is responsible for NAVAREA warnings in the North Atlantic north of 7°N, and west of 15°W. N d. Long range radio navigational warnings are usually broadcast by radiotelephone, radiotelegraph, and radio-teletypewriter. 1015: Which statement about the time diagram shown is correct? (D005NG )
N a. The Greenwich hour angle of the Sun is greater than 180°. N b. The meridian angle of the Sun is labeled west. N c. The date of Greenwich is the day after the date for observer at M. Y d. The Sun has already passed the lower branch of the observer's meridian. 1028: At what angle to the isobars do surface winds blow over the open sea?
N a. About 90° N b. About 50° N c. About 25° Y d. About 15° 1047: Which is NOT a contributing cause of ocean currents?
N a. Surface winds N b. Density differences in the water N c. Underwater topography Y d. Gravitational effects of celestial bodies 1051: Under the IALA Buoyage Systems, a cardinal mark may NOT be used to __________.
N a. indicate that the deepest water in an area is on the named side of the mark N b. indicate the safe side on which to pass a danger N c. draw attention to a feature in the channel such as a bend, junction, bifurcation, or end of a shoal Y d. indicate the port and starboard sides of well-defined channels 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° 1156: When cold air displaces warm air you have a(n) __________.
Y a. cold front N b. occluded front N c. stationary front N d. warm front 1191: You plot a fix using three lines of position and find they intersect in a triangle. The actual position of the vessel __________.
N a. is outside of the triangle N b. may be anywhere in the triangle Y c. may be inside or outside of the triangle N d. is the geometric center of the triangle 1252: Port side daymarks may be __________.
Y a. numbered N b. octagonal N c. black and white N d. of any shape 1267: What will be the velocity of the tidal current at Coxsackie, NY, at 0945 EST (ZD +5) on 11 March 1983?
N a. 0.3 knot Y b. 0.7 knot N c. 1.2 knots N d. 1.9 knots 1344: Which of the buoy symbols shown indicates a safe water mark? (D032NG )
Y a. D N b. C N c. B N d. A 1413: The gyrocompass error resulting from your vessel's movement in OTHER than an east-west direction is called __________.
N a. damping error N b. ballistic deflection N c. quadrantal error Y d. speed error 1445: The planet Mars will have its greatest magnitude when at __________.
N a. conjunction Y b. opposition N c. east quadrature N d. west quadrature 1447: What will be the velocity of the tidal current 6 miles south of Shoal Point, NY, at 1850 DST (ZD +4) on 9 July 1983?
N a. 0.2 knot ebb Y b. 0.2 knot flood N c. 1.2 knot ebb N d. 1.4 knot flood 1459: In a tropical cyclone, in the Northern Hemisphere, a vessel hove to with the wind shifting counterclockwise is __________.
N a. ahead of the storm center N b. in the dangerous semicircle Y c. in the navigable semicircle N d. directly in the approach path of the storm 1466: Advection fog is most commonly caused by __________.
N a. air being warmed above the dew point N b. saturation of cold air by rain N c. a rapid cooling of the air near the surface of the Earth at night Y d. warm moist air being blown over a colder surface 1581: Shown are the symbols used on radio facsimile weather charts. The symbol indicated at letter "I" represents __________. (D042NG )
N a. rain showers Y b. thunderstorms N c. snow storms N d. sand storms 1751: A tsunami is caused by a(n) __________.
N a. tidal wave N b. storm surge caused by a hurricane or tropical storm Y c. earthquake on the ocean's floor N d. tornado 1761: Chart legends which indicate a conspicuous landmark are printed in __________.
N a. italics N b. underlined letters Y c. capital letters N d. boldfaced print 1809: What occurs when rising air cools to the dew point?
N a. Advection fog forms N b. Humidity decreases N c. Winds increase Y d. Clouds form 1827: The position labeled "D" was plotted because __________. (D051NG )
N a. a dead reckoning position is plotted within 30 minutes of a running fix Y b. a dead reckoning position is plotted for each course change N c. the vessel's speed changed at 1125 N d. All of the above 1859: While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers this is a __________.
N a. special purpose signal N b. passing daymark Y c. crossing daymark N d. cable crossing 1920: Because the actual center of some planets may differ from the observed center, the navigator applies a correction known as the __________.
Y a. phase correction N b. refraction correction N c. semidiameter correction N d. augmentation correction 2097: 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 Y b. Broadcast Notice to Mariners N c. Light List Vol. V N d. None of the above 2126: Your chart indicates that there is an isolated rock and names the rock using vertical letters. This indicates the __________.
N a. rock is visible at low water springs only N b. rock is a hazard to deep draft vessels only Y c. rock is dry at high water N d. exact position of the rock is doubtful 2130: You are underway and pass by a lighthouse. Its light, which was white since you first sighted it, changes to red. This means __________.
N a. the light is characterized as alternately flashing N b. the lighthouse has lost power and has switched to emergency lighting N c. it is the identifying light characteristic of the lighthouse Y d. you have entered an area of shoal water or other hazard 2190: Clouds are classified according to their __________.
N a. size N b. moisture content Y c. altitude and how they were formed N d. location in a front 2322: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic north but the compass reads 356°. Which action should be taken?
N a. Use the fore-and-aft magnets and adjust the compass until it reads 358°. Y b. Use the athwartships magnets and adjust the compass until it reads 358°. N c. Use the fore-and-aft magnets and adjust the compass until it reads 000°. N d. Use the quadrantal spheres and adjust the compass until it reads 000°. 2328: Universal time (UTI) is another name for __________.
N a. sidereal time Y b. Greenwich mean time N c. ephemeris time N d. atomic time 2376: A large group of stars revolving around a center is known as a __________.
N a. cluster N b. shower N c. constellation Y d. galaxy 2382: What causes geocentric parallax?
N a. The varying distance between the Earth and Moon. Y b. The change in the Moon's position relative to the stars when viewed from the Earth's surface, as compared to the Earth's center. N c. The rapid change in declination of the Moon causes a rotational oscillation of its axis. N d. The nearness of the Moon causes an apparent increase in diameter as its altitude increases. 2423: IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________.
N a. red conical buoy Y b. green conical buoy N c. red can buoy N d. green can buoy 2468: Under the U.S. Aids to Navigation System on the Western Rivers, the buoys marking the starboard side of the channel when going upstream will be __________.
N a. black Y b. red N c. green N d. yellow 2476: At meridian transit, the diagram used by a navigator to illustrate the angles involved is based on the __________.
N a. celestial equator as observed from above the south celestial pole N b. celestial equator as observed from above the north celestial pole Y c. plane of the observer's meridian N d. plane of the Greenwich meridian 2498: The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers for lights on __________.
Y a. the right descending bank N b. the left descending bank N c. preferred channel buoys N d. daymarks with no lateral significance 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 2616: What is the equivalent of 4 min. 04 sec. in arc units?
N a. 60°16' N b. 8°08' N c. 2°08' Y d. 1°01' 2772: The direction in which a vessel should be steered between two points is the __________.
Y a. course N b. heading N c. bearing N d. course over the ground 2814: In low latitudes the range of the diurnal variation of pressure is up to __________.
N a. 0.5 millibar Y b. 3.0 millibars N c. 6.0 millibars N d. 10.0 millibars 2910: You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________.
N a. 60° N b. 45° Y c. 90° N d. 30° 3060: What information is NOT found in the chart title?
N a. Survey information N b. Scale Y c. Date of first edition N d. Projection 3076: An ECDIS is required to display which information?
N a. Radar targets N b. ARPA vectors Y c. Hydrographic data N d. All of the above 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 3095: ECDIS must have the capability to preserve the record of the track for the previous __________.
N a. 6 hours Y b. 12 hours N c. 18 hours N d. 24 hours