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.
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 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 174: The position labeled D is a(n) __________. (D051NG )
N a. fix N b. running fix N c. estimated position Y d. dead reckoning position 198: You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 343°T at 92 miles from you. What is the time to intercept if you make 9 knots?
N a. 7h 44m N b. 7h 12m Y c. 6h 43m N d. 6h 08m 234: When the declination of the Moon is 0°12.5'S, you can expect some tidal currents in Gulf Coast ports to __________.
N a. exceed the predicted velocities N b. become reversing currents N c. have either a double ebb or a double flood Y d. become weak and variable 309: You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 120°T, 110 miles from your position. The hurricane is moving towards 285°T at 25 knots. What course should you steer at 12 knots to have the maximum CPA?
N a. 332° N b. 339° Y c. 346° N d. 357° 354: In order to remove side error from a sextant, you should adjust the __________.
N a. horizon glass to make it parallel to the horizon mirror with the index set at zero N b. horizon glass to make it perpendicular to the index mirror with the index set at zero Y c. horizon glass to make it perpendicular to the sextant frame N d. telescope to make it parallel to the sextant frame 384: Which is a nonadjustable error of the sextant?
N a. Error of perpendicularity N b. Side error N c. Error of collimation Y d. Centering error 530: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
N a. the port side of the channel N b. the position of underwater cables Y c. safe water N d. a hazard to navigation 558: A buoy bears 176°T at 3000 yards. What is the course to make good to leave the buoy 100 yards to starboard?
Y a. 174°T N b. 176°T N c. 178°T N d. 180°T 565: The letter B as shown represents the __________. (D006NG )
Y a. geoidal horizon N b. celestial horizon N c. visible horizon N d. sensible horizon 587: Your vessel has a draft of 34 feet. On 8 October 1983 you wish to pass over an obstruction near Jaffrey Point, NH, that has a charted depth of 31 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 0900 DST (ZD +4) that this passage can be made?
N a. 0920 Y b. 1029 N c. 1120 N d. 1159 612: Which statement is TRUE concerning a Mercator projection?
N a. Degrees of longitude decrease in length as latitude increases. Y b. The length of the meridians is increased to provide for equal expansion in all directions. N c. The mileage between the meridians is increased as the latitude increases. N d. All of the above 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. 733: What would give the best radar echo?
N a. The beam of a three masted sailing vessel with all sails set. N b. A 110-foot fishing vessel with a radar reflector in its rigging. N c. A 300-foot tanker, bow on. Y d. A 600-foot freighter, beam on. 762: Chart correction information is NOT disseminated through the __________.
N a. Summary of Corrections N b. Local Notice to Mariners N c. Daily Memorandum Y d. Chart Correction Card 775: A sidereal day is shorter than a solar day. This difference is due to __________.
N a. irregularities in the daily rotational rate of the Sun N b. the space motion of the solar system N c. the precession of the equinoxes Y d. the use of different reference points 872: Which agency publishes the Light Lists?
Y a. United States Coast Guard N b. National Ocean Service N c. Oceanographic Office N d. Army Corps of Engineers 937: The north equatorial current flows to the __________.
N a. east N b. northeast N c. southwest Y d. west 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 964: The thin, whitish, high clouds composed of ice crystals, popularly known as "mares' tails" are __________.
Y a. cirrus N b. cirrocumulus N c. altostratus N d. nimbostratus 980: 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 Y b. become weak and variable N c. become reversing currents N d. exceed the predicted velocities 998: The navigable semicircle of a tropical storm in the South Indian Ocean is located on which side of the storm's track?
N a. Rear N b. Front N c. Left Y d. Right 1006: An air mass is termed "warm" if __________.
N a. it is above 70°F Y b. the ground over which it moves is cooler than the air N c. it originated in a high pressure area N d. it originated in a low pressure area 1069: What do the numbers on isobars indicate?
Y a. barometric pressure N b. temperature N c. rain in inches N d. wind speed 1126: When a warm air mass is adjacent to a cold air mass, the separation line between the two is called a(n) __________.
Y a. front N b. isobar N c. isotherm N d. equipotential line 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 1210: 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. N b. Maintain course as it is normal for the range to open as you get close. Y c. Alter course to the left until the range closes, then steer to the left of 306°T. N d. Alter course to the left to close the range, then alter course to 309°T. 1262: A safe water daymark has what shape?
N a. Triangular N b. Diamond N c. Circular Y d. Octagonal 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 1399: You are bound for Baltimore via Cape Henry on a 15 knot ship. If the flood at Chesapeake Bay entrance begins at 1800 EST (ZD +5), at what time would you depart from the Chesapeake Bay entrance to have the most favorable current?
N a. 1700 hours N b. 1800 hours N c. 1900 hours Y d. 2030 hours 1428: The speed of sound in water is approximately __________.
N a. 1.5 times its speed in air N b. 2.5 times its speed in air N c. 3.5 times its speed in air Y d. 4.5 times its speed in air 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 1489: Cumulonimbus clouds can produce __________.
N a. dense fog and high humidity Y b. gusty winds, thunder, rain or hail, and lightning N c. clear skies with the approach of a cold front N d. a rapid drop in barometric pressure followed by darkness 1544: The height of a tide can be increased by __________.
Y a. a storm surge N b. a high pressure area N c. the jet stream N d. a cold front 1544: The height of a tide can be increased by __________.
Y a. a storm surge N b. a high pressure area N c. the jet stream N d. a cold front 1566: The illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates thunderstorms? (D042NG )
Y a. I N b. K N c. L N d. M 1744: Which condition suggests that your present position lies in the navigable semicircle of a tropical storm?
Y a. A backing wind N b. A veering wind N c. Sustained gale force winds N d. A strong wind that maintains a constant speed and direction 1777: If the current and wind are in the same direction, the sea surface represents a wind speed __________.
Y a. lower than actually exists N b. higher than actually exists N c. that actually exists N d. that has no proportional relationship 1779: The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 14 miles and your height of eye is 20 feet, at which approximate distance will you sight the light?
N a. 7.5 miles Y b. 11.2 miles N c. 14.0 miles N d. 18.1 miles 1870: A vessel heading SW is on a course of __________.
N a. 202.5° Y b. 225.0° N c. 247.5° N d. 270.0° 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 1919: The nadir is the point on the celestial sphere that is __________.
N a. 90° away from the zenith N b. over Greenwich N c. on the western horizon Y d. directly below the observer 1978: A celestial body's complete orbit around another body is __________.
N a. a rotation Y b. a revolution N c. space motion N d. nutation 2043: Stormy weather is usually associated with regions of __________.
N a. changing barometric pressure N b. high barometric pressure N c. steady barometric pressure Y d. low barometric pressure 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 2187: The diagram 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. No lights N b. Three red lights N c. Two red lights Y d. One red lights 2224: By convention, the north seeking ends of a compass' magnets are colored __________.
N a. black N b. blue Y c. red N d. white 2330: You are heading in a northerly direction when you come across an easterly current. Your vessel will __________.
Y a. be pushed to starboard N b. be pushed to port N c. decrease in engine speed N d. remain on course 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' 2539: Under the IALA cardinal system, a mark with quick white light showing 3 flashes every 10 seconds indicates that the safest water in the area is on the __________.
N a. north side of the mark N b. west side of the mark Y c. east side of the mark N d. south side of the mark 2707: You will find information about the duration of slack water in the __________.
Y a. Tidal Current Tables N b. Tide Tables N c. American Practical Navigator N d. Sailing Directions 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 2821: The height of tide is the __________.
N a. difference between the depth of the water at high tide and the depth of the water at low tide N b. depth of water at a specific time due to tidal effect Y c. difference between the depth of the water and the area's tidal datum N d. difference between the depth of the water and the high water tidal level 2940: On the Corps of Engineer's Navigation Maps, the channel is __________.
N a. midway between the banks N b. indicated by depths (in feet) Y c. indicated by a broken line N d. not indicated 3003: The height of tide is the __________.
Y a. difference between the depth of the water and the area's tidal datum N b. depth of water at a specific time due to tidal effect 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 3013: A white buoy with an orange rectangle on it displays __________.
Y a. directions N b. dangers N c. exclusion areas N d. All of the above 3014: Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN?
N a. C 356°T, Sp 5.5 knots Y b. C 162°T, Sp 27 knots N c. C 095°T, Sp 30 knots N d. C 268°T, Sp 22 knots 3101: The typical operating range of automatic identification systems (AIS) at sea is nominally __________.
N a. 2 nm N b. 8 nm Y c. 20 nm N d. 40 nm 3114: With respect to automatic identification systems (AIS), which information is expected to be broadcast every 1 to 10 seconds?
N a. Rate of turn N b. Latitude and longitude N c. Navigational status Y d. All of the above