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.
6: Wind velocity varies __________.
N a. directly with the temperature of the air mass Y b. directly with the pressure gradient N c. inversely with the barometric pressure N d. inversely with the absolute humidity 111: Green lights may appear on __________.
Y a. horizontally banded buoys N b. vertically striped buoys N c. yellow buoys N d. spherical buoys 118: What describes an accurate position that is NOT based on any prior position?
N a. Dead-reckoning position N b. Estimated position Y c. Fix N d. Running fix 349: The direction of the southeast trade winds is a result of the __________.
N a. equatorial current N b. humidity Y c. rotation of the earth N d. change of seasons 365: The Sun at a maximum declination north would be approximately at __________.
Y a. aphelion N b. perihelion N c. autumnal equinox N d. first point of Aries 396: Your vessel is on course 150°T, speed 17 knots. The apparent wind is from 40° off the starboard bow, speed 15 knots. What is the speed of the true wind?
N a. 9.0 knots N b. 10.2 knots Y c. 11.0 knots N d. 12.0 knots 482: Which statement about a gnomonic chart is correct?
N a. A rhumb line appears as a straight line. N b. Distance is measured at the mid-latitude of the track line. N c. Meridians appear as curved lines converging toward the nearer pole. Y d. Parallels, except the equator, appear as curved lines. 502: A gnomonic projection is based on a(n) __________.
Y a. plane tangent at one point N b. cylinder tangent at the equator N c. cone tangent at one parallel N d. infinite series of cones tangent at selected parallels 601: White and orange buoys, if lighted, show which color light?
Y a. White N b. Orange N c. Red N d. Alternating yellow and white 609: A tropical wave is located 200 miles due west of your position, which is north of the equator. Where will the wave be in 24 hours?
Y a. Farther away to the west N b. Farther away to the east N c. In the same place N d. Closer and to the west 716: Standard atmospheric pressure in inches of mercury is __________.
N a. 30.00 N b. 28.92 Y c. 29.92 N d. 29.00 742: You are preparing to take a tow from San Diego to Portland, OR. Good seamanship would require that you have on board, available for reference and use, all of the following EXCEPT the __________.
N a. Coast Pilot N b. harbor and coastal charts for ports of refuge enroute Y c. Sailing Directions (Enroute) N d. Light List 751: Under the IALA Buoyage Systems, a yellow buoy may mark __________.
N a. fish net areas N b. spoil areas N c. military exercise zones Y d. All of the above 764: Magnetic variation changes with a change in __________.
N a. the vessel's heading N b. sea conditions N c. seasons Y d. the vessel's position 772: You are hove to in a hurricane on a heading of 328°T. The wind is from 030° true at 119 knots. How should this be encoded on the weather report form under Nddff. (D041NG )
N a. 80312 N b. 83011 N c. 83099 Y d. 80399 806: Temperature and moisture characteristics are modified in a warm or cold air mass due to __________.
N a. pressure changes in the air mass Y b. movement of the air mass N c. the heterogeneous nature of the air mass N d. upper level atmospheric changes 809: The compass rose on a nautical chart indicates both variation and __________.
N a. deviation Y b. annual rate of variation change N c. precession N d. compass error 833: The magnetic compass magnets are acted on by the horizontal component of the Earth's total magnetic force. This magnetic force is GREATEST at the __________.
N a. north magnetic pole N b. south magnetic pole N c. magnetic prime vertical meridian Y d. magnetic equator 870: Vessels should maintain a sharp lookout, especially during December through March, when navigating the right whale's only known calving grounds which lie off the coasts of __________.
N a. Nova Scotia N b. Maine and Massachusetts Y c. Georgia and NE Florida N d. California and Mexico 885: The daily path of a celestial body that is parallel to the celestial equator is the __________.
N a. altitude circle N b. vertical circle Y c. diurnal circle N d. hour circle 943: You should plot your dead reckoning position __________.
N a. when you obtain an estimated position N b. ONLY in piloting waters Y c. at every speed change N d. All of the above are correct. 966: Most high pressure areas in the United States are accompanied by __________.
N a. precipitation Y b. clear, cool weather N c. humid, sticky weather N d. cool fogs 991: You are underway in the North Sea on course 328°T when you sight a buoy broad on your port bow. You are in the best navigable water if the buoy __________.
N a. has a topmark of two cones with points down N b. is a western quadrant buoy N c. is painted yellow on the top half and black on the bottom Y d. exhibits a light with the characteristic of VQ(3)5s 1047: Which is NOT a contributing cause of ocean currents?
N a. Surface winds N b. Density differences in the water N c. Underwater topography Y d. Gravitational effects of celestial bodies 1061: In waters where the cardinal system is used you would expect to find danger __________.
N a. lying to the south of an eastern quadrant buoy Y b. lying to the south of a northern quadrant buoy N c. lying to the east of an eastern quadrant buoy N d. beneath or directly adjacent to the buoy 1103: The vertical component of the Earth's magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation?
Y a. The Flinders bar N b. The heeling magnet N c. Quadrantal soft iron spheres N d. Bar magnets in the binnacle 1137: When the declination of the Moon is 0°12.5'S, you can expect some tidal currents in Gulf Coast ports to __________.
Y a. become weak and variable N b. exceed the predicted velocities N c. become reversing currents N d. have either a double ebb or a double flood 1161: What is characteristic of an occulting light?
N a. 1 sec. flash, 2 sec. eclipse, 1 sec. flash, 5 sec. eclipse N b. 5 sec. flash, 5 sec. eclipse Y c. 4 sec. flash, 2 sec. eclipse, 3 sec. flash, 2 sec. eclipse N d. 6 sec. flash, 6 sec. eclipse 1366: Clouds appearing in the following order: cirrus, cirrostratus, altostratus, stratus, and nimbostratus usually indicate the approach of a(n) __________.
Y a. warm front N b. occluded front N c. medium front N d. cold front 1456: The fog produced by warm moist air passing over a cold surface is called __________.
N a. conduction fog N b. radiation fog N c. frontal fog Y d. advection fog 1618: The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 4 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
Y a. 7.5 miles N b. 9.6 miles N c. 11.2 miles N d. 14.0 miles 1623: Which of the following statements is FALSE?
N a. An anemometer measures wind speed. N b. A barometer measures atmospheric pressure. N c. A thermometer measures temperature. Y d. A psychrometer measures wind pressure. 1633: To find a magnetic compass course from a true course you must apply __________.
Y a. deviation and variation N b. deviation N c. variation N d. magnetic anomalies (local disturbances) 1635: An isotherm is __________.
N a. a line on a weather map connecting equal points of both temperature and pressure N b. an instrument that measures the climatological effects of temperature N c. a line connecting points of equal barometric pressure on a weather map Y d. a line connecting points of equal temperature on a weather map 1651: From which type of cloud can a tornado or waterspout develop?
N a. Nimbostratus N b. Altostratus Y c. Cumulonimbus N d. Cirrus 1677: The position labeled "E" was plotted because __________. (D051NG )
N a. a dead reckoning position is plotted within a half-hour of each course change Y b. a dead reckoning position is plotted for each speed change N c. the position is a running fix 1125 N d. the vessel's position was fixed at 1145 1718: A hurricane is characterized by winds of __________.
N a. up to 33 knots N b. 34 to 47 knots N c. 48 to 63 knots Y d. 64 knots or greater 1860: A vessel heading WSW is on a course of __________.
N a. 202.5° N b. 225.0° Y c. 247.5° N d. 271.0° 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 1924: The point on the celestial sphere that is directly below an observer is the __________.
N a. pole Y b. nadir N c. node N d. zenith 1952: The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?
N a. Libration in longitude Y b. Geocentric libration N c. Diurnal libration N d. Physical libration 1974: Ocean currents are well defined and __________.
N a. create large waves in the direction of the current N b. change direction 360° during a 24 hour period Y c. remain fairly constant in direction and velocity throughout the year N d. are characterized by a light green color 2092: Descending boats, while awaiting their turn to enter a lock, shall NOT block traffic from the lock. They shall be above the lock by at LEAST __________.
N a. 100 feet N b. 200 feet N c. 300 feet Y d. 400 feet 2102: The subregions of the United States Gulf and East Coasts are numbered 11, 12 and 13 within the chart numbering system. Which chart number indicates a chart for either the Gulf or East Coast?
N a. 21214 Y b. 11314 N c. 14313 N d. 14114 2141: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
N a. Red over green N b. Green over red Y c. Red over amber (yellow) N d. Green over amber (yellow) 2345: You should plot your dead reckoning position __________.
N a. from every estimated position N b. every three minutes in pilotage waters N c. only in pilotage waters Y d. from every fix or running fix 2361: The range of tide is the __________.
N a. maximum depth of the water at high tide N b. duration of time between high and low tide N c. distance the tide moves out from the shore Y d. difference between the heights of high and low tide 2387: You are on a voyage from New Orleans to Boston and navigating off the Florida coast. You will get the greatest benefit from the Gulf Stream if you navigate __________.
N a. about 5 miles east of Cape Canaveral N b. about 15 miles east of Daytona N c. along the 50-fathom curve Y d. about 20 miles east of Jupiter Inlet 2438: The radar control that reduces weak echoes out to a limited distance from the ship is the __________.
Y a. sensitivity time control (sea-clutter control) N b. receiver gain control N c. brilliance control N d. fast time constant (differentiator) 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° 2479: The equation of time measures the __________.
N a. difference between local apparent time and Greenwich apparent time N b. longitude in time units N c. difference between sidereal time and local time at the Greenwich meridian Y d. time between the passage of the mean sun and the apparent sun over a meridian 2522: The letter H in illustration D006NG represents the __________. (D006NG )
N a. celestial horizon N b. geoidal horizon Y c. visible horizon N d. refractive horizon 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 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. 2752: A daymark used to indicate the safe water in a channel will have which of the shapes shown? (D045NG )
N a. A N b. B Y c. C N d. D 2896: You are navigating in pilotage waters. The maximum time between fixes should be about __________.
N a. 5 minutes Y b. 30 minutes N c. 1 hour N d. 4 hours 2936: Information on search and rescue procedures and special, local communications used in Mexican waters will be found in the __________.
N a. World Port Index N b. International Code of Signals (Pub 102) Y c. Sailing Directions (Planning Guides) N d. International Aeronautical and Maritime Search and Rescue Manual 3076: An ECDIS is required to display which information?
N a. Radar targets N b. ARPA vectors Y c. Hydrographic data N d. All of the above 3080: Which feature, when set to zero, might allow a GPS unit to have an accuracy equivalent to Precise Positioning Service receiver capability?
N a. Transit Y b. Selective Availability N c. Auto-correlation N d. Anti-spoofing 3082: Which type of GPS receiver has at least four channels to process information from several satellites simultaneously?
N a. Sequential Y b. Continuous N c. Multiplex N d. None of the above