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.
170: Which of the buoy symbols in illustration D032NG indicates a safe water mark?
Y a. D N b. C N c. B N d. A 193: In using Loran-C, skywave reception gives greater range but is __________.
N a. only accurate during daylight hours Y b. much less accurate N c. only accurate at twilight N d. more accurate than using ground waves 200: When navigating using GPS, what is an indicator of the geometry of the satellites that your receiver is locked onto?
Y a. Horizontal Dilution of Precision N b. Selective Availability N c. Doppler Shifting N d. Precision Coding 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 271: Your vessel is leaving New York harbor in dense fog. As the vessel slowly proceeds toward sea, you sight a green can buoy on the starboard bow. Which action should you take?
N a. Turn hard right to get back into the channel. N b. Pass the buoy close to, leaving it to your port. N c. Stop and fix your position. Y d. Stand on, leaving the buoy to your starboard. 316: According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northwest wind, the center of low pressure is located to the __________.
Y a. northeast N b. west-southwest N c. northwest N d. south-southeast 318: Vessels required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
N a. distance to the next port Y b. speed of the vessel over the ground or through the water N c. time of the next navigational satellite pass N d. None of the above 379: The steady current circling the globe at about 60°S is the __________.
N a. Prevailing Westerly N b. Sub-Polar Flow Y c. West Wind Drift N d. Humboldt Current 388: You are underway on course 120°T and your maximum speed is 12 knots. The eye of a hurricane bears 150°T, 120 miles from your position. The hurricane is moving towards 295°T at 20 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?
N a. 89 miles N b. 96 miles N c. 105 miles Y d. 117 miles 416: A ship is on course 195° at a speed of 15 knots. The apparent wind is from 40° on the port bow, speed 30 knots. The direction and speed of the true wind are __________.
N a. 068°T, 30 knots Y b. 127°T, 21 knots N c. 263°T, 42 knots N d. 292°T, 42 knots 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 508: Which statement about the chartlet is TRUE? (Soundings and heights are in meters) (D010NG )
Y a. There is a dangerous eddy southeast of Beito Island. N b. Maury lightship is visible for 17 miles. N c. The bottom to the south-southeast of the lightship is soft coral. N d. There is a 12-meter deep west of Beito Island and inside the 5-meter line. 542: The only cylindrical chart projection widely used for navigation is the __________.
N a. Lambert conformal Y b. Mercator N c. azimuthal N d. gnomonic 560: On 14 April 1981, a back sight is observed of the lower limb of the Sun. The height of eye is 45 feet. The index error is 2.5' on the arc. The sextant altitude (hs) is 117°14.6'. What is the observed altitude (Ho)?
N a. 63°01.9' N b. 63°03.4' N c. 63°07.4' Y d. 63°09.9' 561: Buoys which mark dredging areas are painted __________.
N a. black Y b. yellow N c. green N d. red 613: Your radar indicates a target; however, there is no visible object at the point indicated. A large mountain, approximately 50 miles away on the same bearing as the target, is breaking the horizon. You should suspect the radar target is caused by __________.
N a. a submerged submarine Y b. ducting N c. sub-refraction N d. ionospheric skip waves 613: Your radar indicates a target; however, there is no visible object at the point indicated. A large mountain, approximately 50 miles away on the same bearing as the target, is breaking the horizon. You should suspect the radar target is caused by __________.
N a. a submerged submarine Y b. ducting N c. sub-refraction N d. ionospheric skip waves 647: You will enter Argentia, Newfoundland, at 1200 on 5 October 1983, while keeping zone description +3 on the ship's clocks. What will be the height of tide at this time (based on the Canadian chart datum)?
N a. 0.5 feet N b. 1.2 feet Y c. 2.1 feet N d. 3.4 feet 713: The closest point of approach (CPA) of a contact on a relative motion radar may be determined __________.
N a. immediately when the contact is noted on radar N b. only if the radar scope is watched constantly Y c. after the contact has been marked at least twice N d. by an occasional glance at the radar 723: If there is any doubt as to the proper operation of a radar, which statement is TRUE?
N a. Only a radar expert can determine if the radar is operating. N b. All radars have indicator lights and alarms to signal improper operation. Y c. A radar range compared to the actual range of a known object can be used to check the operation of the radar. N d. The radar resolution detector must be energized to check the radar. 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 1003: The quadrantal spheres are used to __________.
Y a. remove deviation on the intercardinal headings N b. remove deviation on the cardinal compass headings N c. remove heeling error N d. compensate for induced magnetism in vertical soft iron 1045: The Light List shows that a navigational light has a nominal range of 15 miles and a height above water of 40 feet (12.2 meters). Your height of eye is 25 feet (7.6 meters) and the visibility is 5 miles. At about what range will you FIRST sight the light?
N a. 6.2 miles Y b. 9.5 miles N c. 12.9 miles N d. 14.2 miles 1080: Information on northern right whales can be found in __________.
Y a. the Coast Pilot N b. HO 229 N c. the Nautical Almanac N d. Ship's Medicine Chest and Medical Aid at Sea 1147: To make sure of getting the full advantage of a favorable current, you should reach an entrance or strait at which time in relation to the predicted time of the favorable current?
N a. One hour after N b. At the predicted time Y c. 30 minutes before N d. 30 minutes before flood, one hour after an ebb 1164: The largest waves (heaviest chop) will usually develop where the wind blows __________.
N a. at right angles to the flow of the current Y b. against the flow of the current N c. in the same direction as the flow of the current N d. over slack water 1199: The Sailing Directions (Enroute) contain information on __________.
N a. well-charted inner dangers N b. port facilities Y c. coastal anchorages N d. offshore traffic separation schemes 1343: Variation is a compass error that you __________.
N a. can correct by adjusting the compass card N b. can correct by adjusting the compensating magnets N c. can correct by changing the vessel's heading Y d. cannot correct 1427: Determine the duration of the first PM slack water on 3 March 1983, east of the Statue of Liberty, when the current is less than 0.1 knot?
N a. 10 minutes Y b. 13 minutes N c. 16 minutes N d. 19 minutes 1458: When navigating coastwise and hurricane warnings are received, you should __________.
N a. call the Coast Guard to request further information N b. call the NWS for further information N c. just begin to react and make plans Y d. have battened down and be heading for the nearest port of refuge 1565: Determine the approximate geographic visibility of an object, with a height above the water of 85 feet (25.9 meters), for an observer with a height of eye of 60 feet (18.3 meters).
N a. 18.4 nm Y b. 19.9 nm N c. 20.8 nm N d. 21.5 nm 1663: What is the primary source of the earth's weather?
N a. The oceans N b. The moon Y c. The sun N d. The solar system 1710: A gale is characterized by a wind speed of __________.
N a. 10 to 20 knots Y b. 34 to 47 knots N c. 48 to 63 knots N d. 64 to 83 knots 1717: A tropical storm is a tropical cyclone that generates winds of __________.
N a. between 20 and 33 knots Y b. between 34 and 63 knots N c. over 63 knots N d. None of the above 1755: Which weather system produces strong cold winds called "Northers" during the winter months in the Gulf of Mexico?
N a. An anticyclone N b. A high pressure system N c. A cyclone Y d. Both A and B 1776: A vessel operating on the Great Lakes, and whose position is southeast of an eastward-moving storm center, would NOT experience __________.
N a. a falling barometer N b. lowering clouds and drizzle Y c. a northeast wind N d. rain or snow 1829: The illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter E in the illustration? (D036NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No light 1829: The illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter E in the illustration? (D036NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No light 1874: Lighted white and orange buoys must show which color light?
N a. Orange N b. Red N c. Alternating yellow and white Y d. White 1884: If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?
N a. 1648 fathoms N b. 1248 fathoms N c. 1048 fathoms Y d. 824 fathoms 1910: What sextant correction corrects the apparent altitude to the equivalent reading at the center of the Earth?
N a. Phase Y b. Parallax N c. Semidiameter N d. Augmentation 2028: Which stock number indicates an NGA (NIMA) chart designed for navigation and anchorage in a small waterway?
N a. WOAZC17 N b. LCORR5876 Y c. 15XHA15883 N d. PILOT55 2128: Diagram number D037NG represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at B if the lock walls and piers are not awash?
Y a. Three red lights N b. Two red lights N c. One red lights N d. No lights 2159: Induced magnetism is found in __________.
N a. hard iron Y b. soft iron N c. vertical iron only N d. horizontal iron only 2162: The new Moon cannot be seen because the Moon is __________.
N a. in the opposite direction of the Sun N b. below the horizon Y c. between the Earth and the Sun N d. at quadrature 2232: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. Which action should be taken to remove this error during compass adjustment?
N a. If the red ends are to starboard you should raise the athwartships tray. Y b. If the red ends are to starboard, and the athwartships tray is at the bottom, you should remove some magnets. N c. If the red ends are to port, and the athwartships tray is at the top, you should reverse the magnets. N d. If the red ends are to port, and the athwartships tray is at the top, you should lower the tray. 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. 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 2381: The difference between the heights of low and high tide is the __________.
N a. period N b. distance N c. depth Y d. range 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 2528: Illustration D038NG represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter A in the illustration? (D038NG )
N a. One red light N b. Two red lights N c. Two green lights Y d. No light 2579: A phase correction may be applicable to correct the sextant altitude correction of __________.
N a. any star N b. the Sun N c. third magnitude stars only Y d. some planets 2600: A parallel of latitude other than the equator is a __________.
N a. great circle N b. loxodromic curve Y c. small circle N d. gnomonic curve 2812: A line of position from a celestial observation is a segment of a __________.
Y a. circle of equal altitude N b. parallel of declination N c. parallel of altitude N d. vertical circle 2876: On 13 November 1981 you observe a back sight of the lower limb of the Sun. The sextant altitude (hs) is 109°23.6'. The height of eye is 66 feet, and the index error is 2.0' off the arc. What is the observed altitude (Ho)?
N a. 71°01.2' Y b. 70°57.2' N c. 70°45.4 N d. 70°26.4' 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 2899: You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?
N a. 356° N b. 073° N c. 192° Y d. 309° 3064: ECDIS units incorporate Digital Chart Data Formats, which include __________.
N a. vector only N b. raster only Y c. vector and raster N d. imposed viewing 3068: Which of the following data layer categories is NOT displayed on ECDIS?
N a. Notice to Mariners information N b. ECDIS warnings and messages Y c. Ship hydrodynamic information N d. Hydrographic Office data 3073: ECDIS must give an alarm for which of the following cases?
Y a. If the ship is going to reach a critical point on the planned route N b. When the speed of a dangerous target exceeds a set limit N c. If the ship's ETA has changed beyond the set limit N d. All of the above