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.
9: When displayed under a single-span fixed bridge, red lights indicate __________.
Y a. the channel boundaries N b. that vessels must stop N c. the bridge is about to open N d. that traffic is approaching from the other side 78: A single line of position combined with a dead-reckoning position results in a(n) __________.
N a. assumed position Y b. estimated position N c. fix N d. running fix 87: A tide is called diurnal when __________.
Y a. only one high and one low water occur during a lunar day N b. the high tide is higher and the low tide is lower than usual N c. the high tide and low tide are exactly six hours apart N d. two high tides occur during a lunar day 138: The path that a vessel is expected to follow, represented on a chart by a line drawn from the point of departure to the point of arrival, is the __________.
N a. DR plot Y b. track line N c. heading N d. estimated course 141: You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042°T, 105 miles from you. What is the time to intercept if you make 10 knots?
N a. 12h 30m N b. 12h 44m Y c. 12h 58m N d. 13h 22m 209: The West Wind Drift is located __________.
Y a. near 60°S N b. on each side of the Equatorial Current N c. in the North Atlantic between Greenland and Europe N d. in the South Pacific near 5°S 399: Where will you find information about the duration of slack water?
N a. American Practical Navigator N b. Sailing Directions N c. Tide Tables Y d. Tidal Current Tables 471: Yellow lights may appear on __________.
Y a. special purpose buoys N b. vertically-striped buoys N c. horizontally-banded buoys N d. spherical buoys 504: Barometer readings in weather reports are given in terms of pressure at __________.
Y a. sea level N b. Washington, D.C. N c. the weather station N d. the broadcasting station 511: A survey (special purpose mark) buoy __________.
N a. must be lighted N b. may have a flashing red light N c. may have a fixed white light Y d. None of the above 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 652: What agency of the U.S. Government issues charts of U.S. waters and Coast Pilots?
Y a. National Ocean Service N b. National Imagery and Mapping Agency N c. U.S. Coast Guard N d. U.S. Naval Observatory 686: The pressure gradient between the horse latitudes and doldrums runs __________.
N a. east to west Y b. north to south N c. northeast to southwest N d. northwest to southeast 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 749: You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 264°T at 68 miles from you. What is the course to steer at 13 knots to intercept vessel A?
N a. 249° Y b. 256° N c. 262° N d. 268° 750: On a working copy of a weather map, a cold front is represented by what color line?
N a. Red Y b. Blue N c. Alternating red and blue N d. Purple 765: Diurnal aberration is due to __________.
N a. motion of the Earth in its orbit Y b. rotation of the Earth on its axis N c. the body's orbital motion during the time required for its light to reach the Earth N d. a false horizon 781: The IALA Buoyage Systems do NOT apply to __________.
N a. the sides and centerlines of navigable channels N b. natural dangers and other obstructions, such as wrecks Y c. lighthouses and lightships N d. areas in which navigation may be subject to regulation 917: As the South Equatorial Current approaches the east coast of Africa, it divides with the main part flowing south to form the warm __________.
Y a. Agulhas Current N b. Canary Current N c. Benguela Current N d. Madagascar Current 1031: While steaming north of the Irish coast, you sight a buoy which shows the light rhythm shown in illustration D028NG. How would you pass this buoy? (D028NG )
N a. North of the buoy Y b. East of the buoy N c. South of the buoy N d. West of the buoy 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 1041: You are steaming along the coast of Ireland in the Irish Sea. You sight a lighted buoy with a white flashing light showing a group of two flashes. The buoy indicates you __________.
N a. must pass south of the buoy N b. must pass north of the buoy Y c. should pass well clear on either side of the buoy N d. must pass the buoy close to starboard 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 1135: A position on the Earth has a longitude of 74°10'E. Its celestial counterpart would have a __________.
Y a. GHA of 285°50' N b. SHA of 74°10' N c. SHA of 285°50' N d. LHA of 74°10'E 1171: A light that has a light period shorter than its dark period is described as __________.
Y a. flashing N b. pulsating N c. occulting N d. alternating 1201: What is NOT true concerning color sectors of lights?
Y a. Color sectors are expressed in degrees from the light toward the vessel. N b. Color sectors may indicate dangerous waters. N c. Color sectors may indicate the best water across a shoal. N d. Color sectors may indicate a turning point in a channel. 1234: Which information does the outer ring of a compass rose on a nautical chart provide?
N a. Variation Y b. True directions N c. Magnetic directions N d. Annual rate of variation change 1250: Daylight savings time is a form of zone time that adopts the time __________.
Y a. one zone to the east N b. one zone to the west N c. two zones to the east N d. two zones to the west 1255: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. extension of the low pressure ridge N b. direction of circulation and pressure gradient N c. recurvature effect Y d. the wind circulation and forward motion of the storm 1274: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a sandstorm? (D042NG )
N a. H Y b. O N c. P N d. K 1530: In shallow water, waves that are too steep to be stable, causing the crests to move forward faster than the rest of the wave, are called __________.
N a. rollers Y b. breakers N c. white caps N d. surfers 1542: To find a magnetic course from a true course you must apply __________.
N a. magnetic anomalies (local disturbances) N b. deviation Y c. variation N d. deviation and variation 1569: Three or four feet of the total height of a storm surge in a hurricane can be attributed to __________.
N a. an increase in temperature N b. an increase in the wave period N c. the wind velocity Y d. the decrease in atmospheric pressure 1658: Fog forms when the air temperature is at or below __________.
N a. 32° F N b. the wet bulb temperature Y c. the dew point N d. the dry bulb temperature 1759: Which magnetic compass corrector(s) can be set while the vessel is on a heading of magnetic north or magnetic south?
N a. Quadrantal spheres Y b. Heeling magnets N c. Flinders bar N d. Fore-and-aft magnets 1806: Sometimes foreign charts are reproduced by NGA (NIMA). On such a chart a wire dragged (swept) area may be shown in purple or __________.
Y a. green N b. red N c. magenta N d. yellow 1818: In order to utilize the capacity of a lock to its maximum, pleasure craft are locked through with all of the following EXCEPT __________.
N a. coal barges Y b. oil barges N c. sand barges N d. cement barges 1824: 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 C in the illustration? (DO36NG )
N a. One red light N b. Two green lights Y c. Three green lights N d. No light 1976: The Moon is nearest to the Earth at __________.
Y a. perigee N b. the vernal equinox N c. the new Moon N d. the full Moon 2016: Which statement about the Flinders bar of the magnetic compass is CORRECT?
Y a. It compensates for the error caused by the vertical component of the Earth's magnetic field. N b. It compensates for error caused by the heeling of a vessel. N c. It compensates for quadrantal deviation. N d. It is only needed in equatorial waters. 2050: The point where the vertical rise or fall of tide has stopped is referred to as __________.
N a. slack water N b. the rip tide Y c. the stand of the tide N d. the reverse of the tide 2080: You are on course 030°T. The relative bearing of a lighthouse is 45°. What is the true bearing?
N a. 015° Y b. 075° N c. 255° N d. 345° 2099: You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T. The range appears as shown and is closing. Which action should you take? (D047NG )
N a. Continue on the present heading until the range is in line, then alter course to the left. Y b. Continue on course until the range is closed, then alter course to the right. N c. Immediately alter course to the right to bring the range in line. N d. Immediately alter course to 309°T. 2103: The description "Racon" beside an illustration on a chart would mean a __________.
N a. radar calibration beacon N b. circular radio beacon N c. radar conspicuous beacon Y d. radar transponder beacon 2142: Which lights would you see on the Illinois waterway 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. Green over amber (yellow) Y b. Red over amber (yellow) N c. Red over blue N d. Green over red 2164: The line connecting the points of the earth's surface where there is no dip is the __________.
N a. agonic line Y b. magnetic equator N c. isodynamic N d. isopor 2366: The major problem with Moon sights is the __________.
N a. rapid changes in GHA and declination introduce errors into the calculations Y b. lack of a well defined limb during certain phases and positions in the sky N c. approximations used in the solution caused by the variable horizontal parallax N d. augmentation effect caused by the relatively short distance to the Moon 2380: The navigation regulations applicable to a U.S. inland waterway can be found in the __________.
N a. Notices to Mariners N b. Channel Reports N c. Sailing Directions Y d. Coast Pilots 2394: 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 red ends of the magnets are aft, and the fore-and-aft tray is at the top, you should remove some magnets. N b. If the red ends of the magnet are aft, and the fore-and-aft tray is at the bottom, you should reverse the magnets. Y c. If the red ends of the magnets are aft you should raise the fore-and-aft tray. N d. If the blue ends of the magnets are forward you should remove some magnets from the fore-and-aft tray. 2397: The letter D in illustration D006NG represents the __________.
N a. sensible horizon N b. celestial horizon N c. visible horizon Y d. geometrical horizon 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° 2500: When correcting the sextant altitude to apparent altitude you are correcting for inaccuracies in the reading and __________.
Y a. for inaccuracies in the reference level N b. the equivalent reading at the center of the body N c. the equivalent reading from the center of the Earth N d. the bending of the rays of light from the body 2510: When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________.
N a. the equivalent reading to the center of the body N b. the equivalent reading from the center of the Earth N c. the bending of the rays of light from the body Y d. inaccuracies in the reference level 2546: A structure, usually made of stone, or cement pilings, which extends from the bank at approximately right angles to the current is called a __________.
Y a. dike N b. revetment N c. cutoff N d. crib 2703: Which publication indicates the HYDROLANTS or HYDROPACS issued since the previous working day?
N a. Broadcast Notice to Mariners N b. Local Notice to Mariners Y c. Daily Memorandum N d. Summary of Corrections 2724: Which condition indicates that your radar needs maintenance?
Y a. Serrated range rings N b. Indirect echoes N c. Multiple echoes N d. Blind sector 2788: The Light List indicates that a dayboard is a type KGW. You should __________.
N a. see a green and white diamond N b. leave it to port when southbound on the Atlantic Coast ICW N c. pass it close aboard on either side Y d. look for another daymark to form the range 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 3017: A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately __________.
N a. 3 hours N b. 6 1/4 hours Y c. 12 1/2 hours N d. 18 3/4 hours 3091: Which of the following must an ECDIS system be able to perform?
N a. Conversion of "graphical coordinates" to "display coordinates" N b. Transformation of local datum to WGS-'84 datum N c. Calculation of true azimuth and distance between two geographical points Y d. All of the above