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.
15: What is the length of a nautical mile?
N a. 1,800 meters N b. 2,000 yards Y c. 6,076 feet N d. 5,280 feet 70: The station located at "A" is the __________. (D001NG )
N a. on station N b. off station Y c. master station N d. secondary station 133: The line connecting the Loran-C master station with a secondary station is called the __________.
N a. focus line Y b. base line N c. side line N d. center line 171: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
Y a. safe water N b. a fish trap area N c. a hazard to navigation N d. a bifurcation in the channel 231: You are outbound in a buoyed channel on course 015°T. You sight a white light showing a Morse (A) characteristic bearing 359° relative. For safety, you should __________.
N a. change course to 359°T to pass near to the buoy Y b. stay in the channel and leave the buoy to port N c. alter course to 000°T and leave the buoy well clear to starboard N d. check the chart to see where the marked danger lies in relation to the buoy 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 244: To make sure of getting the full advantage of a favorable current, you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?
N a. One hour after the predicted time N b. At the predicted time N c. 30 minutes before flood, one hour after an ebb Y d. 30 minutes before the predicted time 304: In order to remove index error from a sextant, you should adjust the __________.
N a. index mirror to make it parallel to the horizon glass with the index set at zero Y b. horizon glass to make it parallel to the index mirror with the index set at zero N c. horizon glass to make it parallel to the sextant frame N d. telescope to make it perpendicular to the sextant frame 335: What is the geographic longitude of a body whose GHA is 232°27'?
Y a. 127°33'E N b. 52°27'E N c. 61°52'W N d. 61°52'E 455: The height of eye correction is smaller than geometrical dip because of __________.
N a. the angle between the horizontal and the line of sight to the visible horizon N b. index error N c. parallax Y d. terrestrial refraction 487: What will be the time after 0600 (ZD +3), on 6 March 1983, that the height of the tide at Puerto Rosales, Argentina, will be 9.0 feet (2.7 meters)?
N a. 0740 N b. 0754 N c. 0840 Y d. 0922 548: When the declination of the Moon is 0°12.5'S, you can expect some tidal currents in Gulf Coast ports to __________.
N a. have either a double ebb or a double flood N b. become reversing currents Y c. become weak and variable N d. exceed the predicted velocities 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' 606: Early indications of the approach of a hurricane may be all of the following EXCEPT __________.
Y a. short confused swells N b. gradually increasing white clouds (mare's tails) N c. pumping barometer N d. continuous fine mist-like rain 608: In which voyage, between two points, is the rhumb line distance NOT approximately the same as the great circle distance?
N a. The two points are in low latitudes in the same hemisphere. Y b. The two points are in high latitudes in the same hemisphere. N c. The two points are near the equator, but in different hemispheres. N d. One point is near the equator, one point is in a high latitude, and both are near the 180th meridian. 630: What kind of weather would you expect to accompany the passage of a tropical wave?
Y a. Heavy rain and cloudiness N b. Good weather N c. A tropical storm N d. Dense fog 650: What classification of tropical cyclone would have closed isobars, counter clockwise rotary circulation, and sustained winds between 34 and 63 knots?
N a. A tropical disturbance N b. A tropical depression Y c. A tropical storm N d. A hurricane 667: The navigable semicircle of a typhoon in the Southern Hemisphere is the area __________.
N a. behind the typhoon, measured from 90° to 180°From each side of the storm's track Y b. to the right of the storm's track N c. ahead of the typhoon, measured from the storm's track to 90° on each side N d. measured from due south, counterclockwise 180° 718: You are to sail from Elizabethport, NJ, on 22 May 1983 with a maximum draft of 28 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 27 feet. The steaming time from Elizabethport to the obstruction is 1h 40m. What is the earliest time (ZD +4) you can sail on the afternoon of 22 May and pass over the obstruction with 3 feet of clearance?
Y a. 1407 N b. 1331 N c. 1303 N d. 1242 721: Under the IALA Buoyage System, a red and white vertically-striped buoy would NOT indicate __________.
N a. a landfall Y b. the extreme end of an islet N c. a mid-channel N d. a center line 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 799: 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. green can buoy N b. red can buoy Y c. green conical buoy N d. red conical buoy 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 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 922: How is the intensity of a light expressed in the Light Lists?
N a. Luminous range N b. Geographic range Y c. Nominal range N d. Meteorological range 949: In Region A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a __________.
N a. black can buoy Y b. red can buoy N c. black conical buoy N d. red conical buoy 956: Good weather is usually associated with a region of __________.
N a. low barometric pressure Y b. high barometric pressure N c. falling barometric pressure N d. pumping barometric pressure 1027: In the Northern Hemisphere the major ocean currents tend to flow __________.
Y a. clockwise around the North Atlantic and North Pacific Oceans N b. clockwise or counterclockwise depending on whether it is warm or cold current N c. counterclockwise except in the Gulf Stream N d. counterclockwise around the North Atlantic and North Pacific Oceans 1180: You are on course 238°T. To check the course of your vessel you should observe a celestial body on which bearing?
N a. 180° N b. 238° Y c. 328° N d. 090° 1203: If the compass heading and the magnetic heading are the same then __________.
N a. the deviation has been offset by the variation N b. there is something wrong with the compass N c. the compass is being influenced by nearby metals Y d. there is no deviation on that heading 1214: The letter B in the diagram represents the __________. (D006NG )
N a. sensible horizon N b. visible horizon N c. celestial horizon Y d. geoidal horizon 1274: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a sandstorm? (D042NG )
N a. H Y b. O N c. P N d. K 1275: How is variation indicated on a small-scale nautical chart?
N a. Magnetic compass table N b. Magnetic meridians Y c. Isogonic lines N d. Variation is not indicated on small-scale nautical charts. 1276: Which weather change accompanies the passage of a cold front in the Northern Hemisphere?
N a. Wind shift from northeast, clockwise to southwest N b. Steady dropping of barometric pressure N c. Steady precipitation, gradually increasing in intensity Y d. A line of cumulonimbus clouds 1491: You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing?
N a. 138° N b. 270° N c. 318° Y d. 000° 1506: You are steaming southward along the west coast of the United States when you sight a buoy showing a flashing green light. How should you pass this buoy?
N a. Leave it to your port. Y b. Leave it to your starboard. N c. Pass it close aboard on either side. N d. Pass it on either side but well clear of it. 1550: Cirrus clouds are indicated by which number? (D039NG )
Y a. 1 N b. 4 N c. 5 N d. 7 1577: Yesterday your chronometer read 11h 59m 59s at 1200 GMT time tick. Today the chronometer reads 12h 00m 01s at the 1200 GMT tick. What is the chronometer rate?
N a. -1s N b. +1s N c. -2s Y d. +2s 1882: The GP of a body for a high altitude sight is determined from the Greenwich hour angle and the __________.
N a. circle of equal altitude N b. zenith distance N c. azimuth angle Y d. declination 1922: 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? (D030NG )
N a. A N b. B Y c. C N d. D 1972: The point on the celestial sphere that is directly over the observer is the __________.
N a. node N b. pole Y c. zenith N d. nadir 2000: A vessel heading SE is on a course of __________.
N a. 112.5° Y b. 135.0° N c. 157.5° N d. 180.0° 2044: What is the relative bearing of an object broad on the port quarter?
N a. 195° Y b. 225° N c. 240° N d. 265° 2054: The diagram is of a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter B? (D038NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No lights 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 2216: A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 317°. What action should be taken to remove this error during compass adjustment?
N a. Move the quadrantal spheres out. Y b. Move the quadrantal spheres in. N c. If the spheres are in as far as possible replace them with smaller spheres. N d. If the spheres are out as far as possible replace them with smaller spheres. 2274: A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. 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 lower the athwartships tray. N b. If the blue ends of the magnets are to port, and the athwartships tray is at the top, you should reverse the magnets. N c. If the red ends of the magnet are aft, and the fore-and-aft tray is at the top, you should add some more magnets. Y d. If the red ends of the magnets are aft you should lower the fore-and-aft tray. 2298: The period of rotation of the Moon on its axis is __________.
N a. about 19 years N b. 365 days Y c. about 27.3 days N d. 24 hours 2364: The immediate surroundings of what constellation contain the most first magnitude stars?
N a. Libra N b. Cassiopeia N c. Pegasus Y d. Orion 2402: 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°. You should now adjust the compass until it reads __________.
Y a. 358° N b. 000° N c. 002° N d. 004° 2408: What is the equivalent of 42 min. 48 sec. in arc units?
N a. 21°24' N b. 18°16' N c. 11°19' Y d. 10°42' 2442: 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 004°. You should now adjust the compass until it reads __________.
N a. 356° N b. 358° N c. 000° Y d. 002° 2505: At the approaches to Savannah, GA, with the wind coming out of the west, the wind-driven current will be flowing approximately __________.
N a. 280° N b. 260° N c. 100° Y d. 080° 2740: When one upbound vessel is overtaking another vessel and both are pushing a tow ahead, what reaction may you expect?
N a. Both towheads will tend to drift apart, and the overtaking vessel will be slowed down. N b. Both towheads will tend to drift together, and the overtaking vessel will be slowed down. Y c. Both towheads will tend to drift apart, and the overtaken vessel will be slowed down. N d. Both towheads will tend to drift together, and the overtaken vessel will be slowed down. 2866: Some locations maintain a zone time of -13. What are the zone time and date if the Greenwich time and date are 2152, 10 January?
N a. 1052, 9 January N b. 0852, 10 January N c. 1052, 10 January Y d. 1052, 11 January 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 2961: Which position includes the effects of wind and current?
N a. Dead reckoning positions Y b. Estimated positions N c. Leeway position N d. Set position 2962: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 4 1/2 seconds after the signal was sounded. What is the distance to the shore?
N a. 405 yards N b. 628 yards N c. 730 yards Y d. 825 yards 2980: What volume of the Coast Guard Light List is used for the Mississippi River system?
N a. I N b. II N c. IV Y d. V 3037: The letter H in illustration D006NG represents the __________.
Y a. visible horizon N b. celestial horizon N c. geoidal horizon N d. refractive horizon