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.
28: When using a buoy as an aid to navigation which of the following should be considered?
N a. The buoy should be considered to always be in the charted location. N b. If the light is flashing, the buoy should be considered to be in the charted location. Y c. The buoy may not be in the charted position. N d. The buoy should be considered to be in the charted position if it has been freshly painted. 57: The height of tide is the __________.
N a. depth of water at a specific time due to tidal effect Y b. difference between the depth of the water and the area's tidal datum N c. difference between the depth of the water and the high water tidal level N d. difference between the depth of the water at high tide and the depth of the water at low tide 80: When the moon is at first quarter or third quarter phase, what type of tides will occur?
N a. Apogean N b. Perigean Y c. Neap N d. Spring 95: The difference in local time between an observer on 114°W and one on 119°W is __________.
N a. 1.25 minutes N b. 5 minutes Y c. 20 minutes N d. 75 minutes 115: The date is the same all over the world at __________.
N a. 0000 GMT Y b. 1200 GMT N c. 0000 LMT for an observer at 90°E longitude N d. no time 264: Which of the four adjustable errors in the sextant is the principle cause of index error?
N a. Telescope not being parallel to the frame Y b. Index mirror and horizon glass not being parallel N c. Index mirror not being perpendicular to the frame N d. Horizon glass not being perpendicular to the frame 267: 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 )
N a. Alter course to the right to 309°T or more to bring the range in line. Y b. Alter course to the left until the range closes, then steer to the left of 306°T. N c. Alter course to the left to close the range, then alter course to 309°T. N d. Maintain course as it is normal for the range to open as you get close. 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 341: Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?
N a. Flashing N b. Quick flashing Y c. Composite group flashing N d. Equal interval (isophase) 429: A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude?
N a. 127°E Y b. 53°E N c. 27°E N d. 27°W 563: Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. The gyro error is 1°E. Which true bearing should be plotted on the chart?
N a. 313° N b. 314° Y c. 316° N d. 317° 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 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 735: The period of the Earth's revolution from perihelion to perihelion is the __________.
N a. astronomical year Y b. anomalistic year N c. solar year N d. sidereal year 757: The term "flood current" refers to that time when the water __________.
Y a. is flowing towards the land N b. is moving towards the ocean N c. level is not changing N d. level is rising because of heavy rains 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. 785: An amplitude of the Sun in high latitudes __________.
N a. is most accurate before sunrise N b. is most accurate after sunset N c. should only be observed when the Sun's lower limb is above the horizon Y d. is most accurate when the Sun's center is observed on the visible horizon 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 828: The true wind has been determined to be from 210°T, speed 12 knots. You desire the apparent wind to be 30 knots from 10° on the port bow. What course must you steer, and what speed must you make for this to occur?
Y a. 235°T, 18.6 knots N b. 245°T, 20.0 knots N c. 325°T, 22.4 knots N d. 335°T, 23.6 knots 869: Tropical storms and hurricanes are most likely to form in the Southern hemisphere during __________.
Y a. January through March N b. April through May N c. June through August N d. September through November 935: The Light List shows that a navigational light has a nominal range of 5 miles and a height above water of 21 feet (6.4 meters). Your height of eye is 32 feet (9.8 meters) and the visibility is 1.0 mile. At what approximate range will you first sight the light?
N a. 1.0 mile Y b. 1.5 miles N c. 5.0 miles N d. 11.7 miles 1008: The Light List indicates that a light has a nominal range of 18 miles and is 38 feet high. If the visibility is 6 miles and your height of eye is 15 feet, at which distance will you sight the light?
N a. 18.0 nm N b. 14.8 nm Y c. 11.7 nm N d. 6.0 nm 1016: A source of an air mass labeled mTw is __________.
N a. the equator Y b. the Gulf of Mexico N c. Alaska N d. Canada 1050: The passing of a low pressure system can be determined by periodically checking the __________.
N a. thermometer N b. hygrometer Y c. barometer N d. anemometer 1070: Chart legends which indicate a conspicuous landmark are printed in __________.
N a. underlined letters Y b. capital letters N c. italics N d. boldface print 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 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 1175: Solid green arrows on the main body of a pilot chart indicate __________.
N a. prevailing wind directions Y b. prevailing ocean current directions N c. probable surface current flow N d. shortest great circle routes 1201: What is NOT true concerning color sectors of lights?
Y a. Color sectors are expressed in degrees from the light toward the vessel. N b. Color sectors may indicate dangerous waters. N c. Color sectors may indicate the best water across a shoal. N d. Color sectors may indicate a turning point in a channel. 1266: A line of clouds, sharp changes in wind direction, and squalls are most frequently associated with a(n) __________.
N a. occluded front N b. warm front Y c. cold front N d. warm sector 1280: A current perpendicular to a vessel's track has the greatest effect on the vessel's course made good __________.
N a. at high vessel speeds Y b. at low vessel speeds N c. in shallow water N d. in deep water 1308: On a voyage from Cape Town to London, the favorable ocean current off the coast of Africa is the __________.
N a. Canary Current Y b. Benguela Current N c. Agulhas Current N d. South Atlantic Current 1329: Yesterday your chronometer read 03h 01m 56s at the 1500 GMT time tick. Today your chronometer read 03h 01m 54s at the 1500 GMT time tick. What is the chronometer rate?
N a. 1m 54s fast N b. 2s fast Y c. -2s N d. +2s 1346: Cirrus clouds followed by cirrostratus then altostratus, stratus, and occasionally nimbostratus indicate the approach of a(n) __________.
N a. cold front Y b. warm front N c. tropical front N d. occluded front 1346: Cirrus clouds followed by cirrostratus then altostratus, stratus, and occasionally nimbostratus indicate the approach of a(n) __________.
N a. cold front Y b. warm front N c. tropical front N d. occluded front 1357: You will transit the Cape Cod Canal on 7 November 1983. If you arrive at the R R Bridge at 1655 EST (ZD +5), for what period of time during your transit will you have currents of not more than 0.5 knot?
N a. 1631 to 1719 N b. 1638 to 1655 Y c. 1648 to 1702 N d. 1655 to 1709 1498: A true bearing of a charted object, when plotted on a chart, will establish a __________.
N a. fix Y b. line of position N c. relative bearing N d. range 1503: A radar range to a small, charted object such as a light will provide a line of position in which form?
N a. Straight line Y b. Arc N c. Parabola N d. Hyperbola 1539: You are steaming in the open ocean of the North Pacific between the Aleutian Chain and Hawaii. A warning broadcast indicates that an earthquake has occurred in the Aleutians and has generated a tsunami that is predicted to hit Hawaii. What action is necessary for the ship's safety?
N a. Calculate the tsunami's ETA at your position and turn to a course that will head into the Tsunami. N b. Securely stow all loose gear, check deck lashings, and prepare for extreme rolls. Y c. No special action as tsunamis are inconspicuous in the open ocean N d. Prepare for sudden, high-velocity wind gusts from rapidly changing directions. 1555: Under the U.S. Aids to Navigation System, a yellow buoy is a __________.
N a. safe water buoy N b. junction buoy N c. cardinal mark Y d. special purpose mark 1585: The sidereal day begins when the __________.
Y a. first point of Aries is over the upper branch of the reference meridian N b. Sun is over the lower branch of the reference meridian N c. Sun is over the upper branch of the reference meridian N d. first point of Aries is over the lower branch of the reference meridian 1617: The inner cloud bands of a hurricane, when viewed from a distance, form a mass of dense, black cumulonimbus clouds called the __________.
Y a. bar of the storm N b. eye of the storm N c. funnel N d. front 1706: In the Northern Hemisphere a wind is said to veer when the wind __________.
Y a. changes direction clockwise, as from north to east, etc. N b. changes direction violently and erratically N c. remains constant in direction and speed N d. changes direction counterclockwise, as from south to east, etc. 1734: The eye of the hurricane has __________.
N a. very high barometric pressure N b. average barometric pressure Y c. the lowest barometric pressure N d. no change in barometric pressure 1750: Clearance gauges at bridges indicate __________.
N a. the height of the tide N b. depth of water under the bridge N c. charted vertical clearance at mean low water Y d. distance from the water to low steel of the bridge 1760: A Doppler log in the bottom return mode indicates the __________.
N a. velocity of the current N b. bottom characteristics N c. depth of the water Y d. speed over the ground 1799: The letter D in illustration D006NG represents the __________.
N a. celestial horizon N b. visible horizon Y c. geometrical horizon N d. geoidal horizon 2053: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
N a. a sharp turn in the channel to the right Y b. the port side of the channel N c. a junction with the preferred channel to the left N d. a wreck to be left on the vessel's starboard side 2075: 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. Light List Vol. V N b. U.S. Coast Pilot Y c. Broadcast Notice to Mariners N d. Sailing Directions 2083: 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. U.S. Coast Pilot Y b. Broadcast Notice to Mariners N c. Sailing Directions N d. Light List Vol. V 2248: A vessel is heading magnetic north and its magnetic compass indicates a heading of 356°. What action should be taken to remove this error during compass adjustment?
N a. If the red ends of the magnets are to port you should raise the athwartships tray. N b. If the red ends of the magnets are to port, and the athwartships tray is at the top, you should add some more magnets. N c. If the red ends of the magnets are to starboard you should lower the athwartships tray. Y d. If the red ends of the magnets are to starboard, and the athwartships tray is at the top, you should add some more magnets. 2284: Bellatrix is found in what constellation?
N a. Canis Minor N b. Gemini N c. Taurus Y d. Orion 2290: Magnets in the binnacles of magnetic compasses are used to reduce the effect of __________.
Y a. deviation N b. variation N c. local attraction N d. All of the above 2306: In the North Sea area, you sight a buoy showing a quick white light with 9 flashes every 15 seconds. Which of the four topmarks shown would be fitted to the buoy? (D031NG )
Y a. A N b. B N c. C N d. D 2317: The Light List indicates that a light has a nominal range of 13 miles and is 36 feet high (11.0 meters). If the visibility is 7.0 miles and your height of eye is 25 feet (7.6 meters), at what approximate distance will you sight the light?
Y a. 10.0 miles N b. 12.9 miles N c. 14.2 miles N d. 17.0 miles 2384: On U.S. charts, you can tell if a named feature such as a rock (i.e. Great Eastern Rock in Block Island Sound) is submerged by the __________.
N a. color of ink used to print the name Y b. style of type used to print the name N c. dashed circle around the feature N d. magenta circle around the feature 2450: You are on course 180°T and take a relative bearing of a lighthouse of 225°. What is the true bearing of the lighthouse?
Y a. 045° N b. 135° N c. 180° N d. 270° 2638: A vessel crossing a river on the Western Rivers has the right of way over __________.
N a. vessels ascending the river N b. vessels descending the river N c. all vessels ascending and descending the river Y d. None of the above 2887: The letter B in illustration D006NG represents the __________.
N a. visible horizon N b. sensible horizon Y c. geoidal horizon N d. celestial horizon 3087: With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.
Y a. a warning of loss of position N b. a cross-track error alarm N c. an indication of a change in satellite configuration N d. an alarm if engine speed is suddenly reduced