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.
121: A safe water mark may be __________.
N a. vertically striped N b. spherical N c. showing a white light Y d. All of the above 124: An electronic depth finder operates on the principle that __________.
N a. radio signals reflect from a solid surface Y b. sound waves travel at a constant speed through water N c. radar signals travel at a constant speed through water N d. pressure increases with depth 158: Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, the current could be __________.
N a. with you at 10 knots N b. against you at 10 knots Y c. slack N d. with you at 2 knots 203: In any Loran-C chain, there are three or more stations transmitting pulses which radiate in all directions. One of the stations is the master station, and the others in the chain are the __________.
N a. radio stations Y b. secondary stations N c. monitor stations N d. pulse stations 225: The equation of time is 8m 40s. The apparent Sun is ahead of the mean Sun. If you are on the central meridian of your time zone, the apparent Sun will cross your meridian at __________.
Y a. 11-51-20 ZT N b. 12-00-00 ZT N c. 12-04-20 ZT N d. 12-08-40 ZT 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 330: You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________.
Y a. 90° N b. 30° N c. 45° N d. 60° 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. 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 571: The Coast Guard Captain of the Port has excluded all traffic from a section of a port, while a regatta is taking place. The buoys marking this exclusion area will be __________.
N a. nun- or can-shaped to conform to the overall direction of navigation N b. yellow Y c. orange and white N d. marked with a spherical topmark 646: You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere. What action should you take to avoid the storm?
N a. Place the wind on the starboard quarter and hold that course. N b. Place the wind on the port quarter and hold that course. N c. Place the wind on the port bow and hold that course. Y d. Place the wind on the starboard bow and hold that course. 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 655: The equator is __________.
Y a. the primary great circle of the Earth perpendicular to the axis N b. the line to which all celestial observations are reduced N c. the line from which a celestial body's altitude is measured N d. All of the above 679: A tropical wave is usually preceded by __________.
N a. tropical storms Y b. good weather N c. heavy rain and cloudiness N d. heavy seas 693: Which general statement concerning radar is FALSE?
N a. Raising the antenna height increases the radar range. Y b. The ability of radar to detect objects is unaffected by weather conditions. N c. Radar bearings are less accurate than radar ranges. N d. Radar should be checked regularly during clear weather to ensure that it is operating properly. 736: A line on a weather chart connecting places which have the same barometric pressure is called an __________.
N a. isotherm N b. isallobar Y c. isobar N d. isotope 778: The navigable semicircle of a hurricane in the Northern Hemisphere is that area of the storm measured __________.
N a. from true north clockwise to 180°T N b. from true north counterclockwise to 180°T N c. from the bow counterclockwise to 180° relative Y d. from the direction of the storm's movement counterclockwise 180° 824: An "atoll cloud" forming over an island due to heating of the land during the daytime would be which type?
N a. Cirrus Y b. Cumulus N c. Stratus N d. Nimbus 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 850: When is the peak of the hurricane season in the western North Pacific?
N a. January through March N b. April through June Y c. July through October N d. November through December 986: A warm air mass is characterized by __________.
Y a. stability N b. instability N c. gusty winds N d. good visibility 1035: The approximate positions of the stars are based on sidereal time, which is based upon rotation of the Earth relative to __________.
N a. winter solstice N b. autumnal equinox N c. summer solstice Y d. vernal equinox 1057: One of the causes of ocean currents is density differences in the water. This is true because __________.
N a. in an area of high density the water's surface is lower than in an area of low density Y b. surface water flows from an area of high density to one of low density N c. the lesser the density gradient the freer the water is to move N d. it is the density differences that cause the currents to stay in the troughs 1063: When adjusting a magnetic compass using the fore-and-aft permanent magnets, you should __________.
N a. use the magnets one at a time, putting one in one side and then one on the opposite side, one step higher. N b. use the magnets in pairs, starting at the top, with trays at the highest point of travel Y c. use the magnets in pairs, from the bottom up, with the trays at the lowest point of travel N d. fill all the trays with magnets, then remove them one-by-one until the deviation is removed 1071: A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the __________.
Y a. north side of the mark N b. west side of the mark N c. east side of the mark N d. south side of the mark 1112: Considering the general circulation of the atmosphere, the wind system between latitudes 30°N and 60°N is commonly called the __________.
Y a. prevailing westerlies N b. horse latitudes N c. trade winds N d. subpolar low pressure belts 1188: The magnitude of three stars is indicated. Which star is the brightest?
N a. Antares + 1.2 N b. Altair + 0.9 Y c. Vega + 0.1 N d. Cannot be determined; magnitude indicates size not brightness 1202: As shown in the illustration, which wind speeds are reported at position A? (D049NG )
N a. 10 knots Y b. 15 knots N c. 20 knots N d. 25 knots 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 1469: The charted channel depth at Eastport, ME, is 28 feet. You are drawing 31.5 feet and wish 2 feet clearance under the keel. What is the earliest time after 1700 (ZD +4) on 6 September 1983 that you can enter the channel?
N a. 1825 N b. 1903 Y c. 1915 N d. 2003 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 1540: You are sailing south on the Intracoastal Waterway (ICW) when you sight a green can buoy with a yellow square painted on it. Which of the following is TRUE?
N a. You should pass the buoy close aboard on either side. N b. The buoy marks the end of the ICW in that area. Y c. You should leave the buoy to port. N d. The yellow square is retroreflective material used to assist in sighting the buoy at night. 1715: The hurricane season generally occurs from __________.
N a. August to January N b. July to December Y c. June to November N d. January to June 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 1816: A white buoy with an orange circle marked on it indicates __________.
N a. danger N b. vessels are excluded from the area N c. a mooring buoy Y d. operating restrictions are in effect 1928: "Rotation" is the __________.
N a. wobbling of the Earth about its axis N b. motion of bodies in the solar system relative to the stars N c. motion of a celestial body in its orbit Y d. spinning of a celestial body about its axis 1987: An instrument useful in predicting fog is the __________.
Y a. sling psychrometer N b. microbarograph N c. anemometer N d. aneroid barometer 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 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 2165: The illustration 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? (D037NG )
Y a. Three red lights N b. Two red lights N c. One red light N d. One amber light 2176: The illustration 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 D if the lock walls and piers are not awash? (D037NG )
N a. Three red lights N b. Two red lights Y c. One red light N d. One amber light 2182: 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 D if the lock walls and piers are not awash?
N a. No lights Y b. One red light N c. Two red lights N d. Three red lights 2210: A dead reckoning (DR) plot __________.
Y a. ignores the effect of surface currents N b. is most useful when in sight of land N c. must be plotted using magnetic courses N d. may be started at an assumed position 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. 2354: A vessel is heading magnetic east and its magnetic compass indicates a heading of 093°. What action should be taken to remove this error during compass adjustment?
N a. If the blue ends of the magnets are to port you should raise the athwartships tray. N b. If the red ends of magnets are to port you should lower the athwartships tray. N c. If the red ends of the magnets are aft you should lower the fore-and-aft tray. Y d. If the blue ends of the magnets are forward you should raise the fore-and-aft tray. 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 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 2639: Under the U.S. Aids to Navigation System used on the Western Rivers, aids to navigation lights on the right descending bank show __________.
Y a. white or green lights N b. white or red lights N c. green lights only N d. white lights only 2688: The 10-cm radar as compared to a 3-cm radar of similar specifications will __________.
N a. be more suitable for river and harbor navigation N b. provide better range performance on low lying targets during good weather and calm seas Y c. have a wider horizontal beam width N d. have more sea return during rough sea conditions 2726: A daymark used as a special mark is indicated by which letter in the diagram? (D045NG )
N a. A Y b. B N c. C N d. D 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 2839: Privately maintained aids to navigation included in the Light List __________.
N a. are painted white and must use a white light if lighted N b. must be conspicuously marked by a signboard with the words "PRIVATE AID" Y c. must conform to the standards of the U.S. Aids to Navigation System N d. are not permitted in or along first-class waterways and may be authorized for second- and third-class waterways 2840: The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with?
N a. A downbound vessel N b. An upbound vessel Y c. Current reaction when the lock chamber is being emptied N d. Current reaction when the lock chamber is being filled 2840: The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with?
N a. A downbound vessel N b. An upbound vessel Y c. Current reaction when the lock chamber is being emptied N d. Current reaction when the lock chamber is being filled 2875: A harbor chart could have a scale of __________.
N a. not more than 1:25,000 Y b. 1:35,000 N c. 1:150,000 N d. not less than 1:500,000 2925: A single line of position combined with a dead-reckoning position results in a(n) __________.
N a. running fix N b. fix N c. assumed position Y d. estimated position 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 2960: What is NOT found in the Mississippi River System Light List?
Y a. Distance that a lighted aid to navigation can be seen at night N b. Distance between major points on the Mississippi River N c. A color plate showing the details of the aids to navigation used on the Mississippi River N d. Times of Coast Guard broadcasts concerning river stages 3083: Which theoretical minimum number of measurements from satellites does a GPS receiver need in order to provide an exact three-dimensional position?
N a. Five Y b. Four N c. Three N d. Two 3115: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?
Y a. Time stamp N b. Destination N c. Location of antenna N d. None of the above