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.
16: The direction of the surface wind is __________.
N a. directly from high pressure toward low pressure N b. directly from low pressure toward high pressure Y c. from high pressure toward low pressure deflected by the earth's rotation N d. from low pressure toward high pressure deflected by the earth's rotation 97: The lunar or tidal day is __________.
N a. about 50 minutes shorter than the solar day Y b. about 50 minutes longer than the solar day N c. about 10 minutes longer than the solar day N d. the same length as the solar day 155: The velocity of the current in large coastal harbors is __________.
Y a. predicted in Tidal Current Tables N b. unpredictable N c. generally constant N d. generally too weak to be of concern 202: On charts of U.S. waters, a magenta marking is NOT used for marking a __________.
N a. radio beacon N b. lighted buoy N c. prohibited area Y d. 5-fathom curve 210: The position labeled C is a(n) __________. (D051NG )
N a. fix Y b. running fix N c. estimated position N d. dead reckoning position 211: The light rhythm of Morse (A) is shown on __________.
N a. preferred-channel buoys N b. starboard- or port-side buoys N c. special marks Y d. safe water buoys 241: A spherical buoy may be __________.
N a. numbered Y b. lettered N c. green N d. red 283: Loran-C operates on a single frequency centered on __________.
Y a. 100 kHz N b. 500 kHz N c. 1,850 kHz N d. 1,950 kHz 297: The tides in Boston Harbor generally __________.
N a. are diurnal in nature N b. have their variations caused by the changing declination of the Moon Y c. have a greater range than the tides in Gulf Coast ports N d. All of the above 368: A great circle crosses the equator at 134°E. It will also cross the equator at what other longitude?
Y a. 46°W N b. 124°W N c. 134°W N d. 34°E 419: The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the __________.
N a. abyssal plain Y b. continental shelf N c. borderland N d. offshore terrace 478: The velocity of the apparent wind can be more than the true wind, and come from the same direction, if certain conditions are present. One condition is that the __________.
N a. ship's speed must be less than the true wind velocity N b. true wind must be from dead astern N c. true wind velocity must be faster than the ship's speed Y d. true wind must be from dead ahead 569: A line of position formed by sighting two charted objects in line is called a(n) __________.
N a. relative bearing Y b. range line N c. track line N d. estimated position 598: A great circle crosses the equator at 141°E. It will also cross the equator at what other longitude?
N a. 180°E N b. 41°E N c. 141°W Y d. 39°W 600: The dangerous semicircle of a typhoon in the Southern Hemisphere is that area __________.
N a. measured from due south clockwise 180° N b. measured from due south counterclockwise 180° Y c. to the left of the storm's track N d. ahead of the typhoon measured from the storm's track to 90° on each side 614: A marine chronometer should be rewound once every __________.
N a. 12 hours Y b. day N c. 3 days N d. week 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 701: In the IALA Buoyage System, buoys with alternating red and green horizontal bands are used to indicate __________.
N a. fishing areas N b. spoil grounds Y c. the preferred channel N d. isolated dangers 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 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 777: With respect to a reversing current, slack water occurs when there is __________.
Y a. little or no horizontal motion of the water N b. little or no vertical motion of the water N c. a weak ebb or flood current N d. when winds cause water to back up in a river mouth 856: The flow of air around an anticyclone in the Southern Hemisphere is __________.
N a. clockwise and outward Y b. counterclockwise and outward N c. clockwise and inward N d. counterclockwise and inward 992: Which publication contains information on Naval Control of Shipping (NCS) in time of emergency or war?
Y a. Pub. 117, Radio Navigational Aids N b. Appropriate volume of the Sailing Directions N c. Pub. 102, International Code of Signals N d. Light List 1032: What is the approximate geographic range of Point Judith Light, Rhode Island, if your height of eye is 62 feet (18.9 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS" .
N a. 9.6 nm N b. 16.5 nm Y c. 18.6 nm N d. 20.7 nm 1131: On navigational aids, what does the light characteristic "Fl(2+1)" mean?
N a. A flashing light combined with a fixed light of greater brightness Y b. Light flashes combined in groups, with a different number of flashes in each group N c. A light showing groups of two or more flashes at regular intervals N d. A fixed light varied at regular intervals by groups of two or more flashes of greater brightness 1153: Heeling error is defined as the change of deviation for a heel of __________.
N a. 2°While the vessel is on an intercardinal heading Y b. 1°While the vessel is on a compass heading of 000° N c. 2° and is constant on all headings N d. 1° while the vessel is on a compass heading of 180° 1238: What will be the height of tide at Three Mile Harbor Entrance, Gardiners Bay, NY, at 0700 (ZD +5) on 14 Nov 1983?
N a. 1.1 feet (0.3 meters) Y b. 1.7 feet (0.5 meters) N c. 1.9 feet (0.6 meters) N d. 2.2 feet (0.7 meters) 1345: A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol in illustration D015NG?
N a. D N b. C Y c. B N d. A 1363: True heading differs from magnetic heading by __________.
N a. deviation Y b. variation N c. compass error N d. northerly error 1463: If the gyrocompass error is east, what describes the error and the correction to be made to gyrocompass headings to obtain true headings?
Y a. The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true N b. The readings are too low and the amount of the error must be subtracted from the compass to obtain true N c. The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true N d. The readings are too high and the amount of the error must be subtracted from the compass to obtain true 1499: You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?
Y a. Starting with a dash and extending radially outward from the target N b. As a broken line from center of PPI to the target N c. Starting with a dot and extending radially inward from the target N d. Starting with a dash and extending to the right of the target 1509: Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours. You should __________.
N a. expect to see cirrus clouds followed by altostratus and nimbostratus clouds N b. alter course to remain in the navigable semicircle Y c. prepare for gusty winds, thunderstorms, and a sudden wind shift N d. expect clear weather, with steady winds and pressure, until the front passes 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. 1688: Which type of front forms when a cold front overtakes and forces a warm front upwards?
N a. A cold front Y b. An occluded front N c. A warm front N d. A stationary front 1696: Two well-developed high pressure areas may be separated by a __________.
N a. hill of low pressure Y b. trough of low pressure N c. valley of low pressure N d. ridge of low pressure 1721: A storm's track is characterized by all of the following except __________.
N a. the direction the storm has come from N b. the direction in which the storm is moving Y c. the speed at which the storm is moving N d. the path taken by the storm 1754: The dumping of refuse in a lock is permitted __________.
N a. when approved by the lockmaster N b. when locking downbound Y c. at no time N d. during high water only 1780: While in port, you can follow the approach of a dangerous cyclonic storm by inspecting __________.
N a. the Coast Pilot or Sailing Directions N b. the National Weather Service Observing Handbook No.1, Marine Surface Observations Y c. a newspaper N d. the sky overhead 1990: The navigational triangle uses parts of two systems of coordinates, one of which is the celestial equator system, the other system is the __________.
N a. terrestrial system Y b. horizon system N c. astronomical system N d. ecliptic system 2079: Permission to enter the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal?
N a. One short blast N b. Two short blasts N c. One long blast Y d. Two long blasts 2098: Which magnetic compass corrector(s) can be set while the vessel is on a heading of magnetic east or magnetic west?
N a. Quadrantal spheres N b. Heeling magnets Y c. Fore-and-aft magnets N d. Athwartships magnets 2101: 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 __________.
Y a. Broadcast Notice to Mariners N b. Light List Vol. V N c. U.S. Coast Pilot N d. All of the above 2110: You are underway in a vessel with a draft of 6.0 feet. You are in an area where the charted depth of the water is 4 fathoms. You would expect the depth of water beneath your keel to be approximately __________.
N a. 12 feet Y b. 18 feet N c. 24 feet N d. 30 feet 2111: Vessels regularly navigating Ohio and Mississippi rivers above Cairo, Illinois, and their tributaries, shall at all times have on board a copy of __________.
N a. Tide Tables N b. U.S. Coast Pilot Y c. U.S. Army Corps of Engineers Navigation Regulations (Blue Book) N d. Sailing Directions 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 2248: A vessel is heading magnetic north and its magnetic compass indicates a heading of 356°. 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 raise the athwartships tray. N b. If the red ends of the magnets are to port, and the athwartships tray is at the top, you should add some more magnets. N c. If the red ends of the magnets are to starboard you should lower the athwartships tray. Y d. If the red ends of the magnets are to starboard, and the athwartships tray is at the top, you should add some more magnets. 2409: You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?
N a. Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach N b. Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges N c. Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. Y d. Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. 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° 2464: Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which topmark shown? (D046NG )
N a. A Y b. B N c. C N d. D 2666: The following boats are approaching a lock. Which has priority for locking?
N a. An 85-foot yacht Y b. Corps of Engineer towboat running empty-headed N c. "Delta Queen" (passenger vessel) N d. An integrated chemical tow 2710: In the horizon system of coordinates what is equivalent to the local hour angle of the celestial equator system?
N a. Altitude Y b. Azimuth N c. Zenith distance N d. Colongitude 2720: When pushing barges ahead close to a steep revetment where there is no current, what is MOST likely to occur?
N a. The stern of the towboat will tend to sheer away from the revetment. N b. Your speed over the ground will increase. Y c. The head of the tow will tend to sheer away from the revetment. N d. All of the above 2774: Your radar is set on a true motion display. Which of the following will NOT appear to move across the PPI scope?
Y a. Echoes from a buoy N b. Own ship's marker N c. Echo from a ship on the same course at the same speed N d. Echo from a ship on a reciprocal course at the same speed 2782: Your radar is set on a true motion display. Which of the following will appear to move across the PPI scope.
Y a. Own ship's marker N b. Echo from a ship at anchor N c. Echoes from land masses N d. All of the above 2804: The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs. This procedure should not be used __________.
N a. when the declination and latitude are of different names N b. when the declination is greater than and the same name as the latitude N c. if the vessel is stopped or making bare steerageway Y d. on a fast vessel on northerly or southerly headings 2826: 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° Y b. 102° N c. 144° N d. 201° 3022: A green-and-red banded daymark, green band uppermost, will have the shape shown at letter __________. (D045NG )
Y a. A N b. B N c. C N d. D 3063: Which of the following must the electronic chart of an ECDIS display, as required by IMO/IHO?
N a. Hydrography N b. Ferry routes N c. Regulatory boundaries Y d. All of the above 3112: With respect to automatic identification systems (AIS) which of the following information is broadcast every one to ten seconds?
N a. Vessel's draft N b. Air Draft Y c. Navigational status N d. Dimensions of vessel 3122: The short text messaging feature of the automatic identification system (AIS) allows for messages of up to ___.
N a. 96 characters Y b. 158 characters N c. 256 characters N d. 384 characters