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.
2: On an isomagnetic chart, the line of zero variation is the __________.
N a. zero variation line N b. isogonic line N c. variation line Y d. agonic line 164: The part of a sextant mounted directly over the pivot of the index arm is the __________.
Y a. index mirror N b. horizon glass N c. micrometer drum N d. telescope 215: The equation of time is 12m 00s and the mean Sun is ahead of the apparent Sun. If you are on the central meridian of your time zone, at what zone time will the apparent Sun cross the meridian?
N a. 1148 N b. 1200 Y c. 1212 N d. It cannot be determined from the information given. 229: The shoreline on charts generally represents the mean __________.
Y a. high water line N b. low water line N c. low water spring line N d. tide level 239: As you enter a channel from seaward in a U.S. port, the numbers on the starboard side buoys __________.
N a. decrease and the buoys are black N b. increase and the buoys are green N c. decrease and the buoys are red Y d. increase and the buoys are red 381: A nun buoy will __________.
N a. be green in color Y b. have an even number N c. be left to port when entering from seaward N d. be cylindrical in shape 408: A buoy bears 176°T at 3000 yards. What is the course to make good to leave the buoy 100 yards to port?
N a. 174°T N b. 176°T Y c. 178°T N d. 180°T 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 468: Which of the symbols shown represents a cold front? (D018NG )
N a. A Y b. B N c. C N d. D 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 519: The chart of a beach area shows a very flat slope to the underwater beach bottom. What type of breakers can be expected when trying to land a boat on this beach?
N a. Surging Y b. Spilling N c. Plunging N d. Converging 610: The apparent wind's speed can be zero, but only when two conditions are present. One condition is that the true wind __________.
N a. must be from dead ahead N b. speed must be zero Y c. must be from dead astern N d. must be on the beam 708: Which statement about Radio Navigational Warning Broadcasts is TRUE?
N a. Radio navigational warnings are valid for 10 days, unless cancelled earlier. N b. NAVAREA warnings cover coastal areas only, while HYDROLANTS or HYDROPACS cover entire ocean areas. Y c. Radio navigational warnings issued by NGA (NIMA) are published in the Daily Memorandum and the Notice to Mariners. N d. HYDROLANTS and HYDROPACS cover the same geographical areas as NAVAREA warnings, but are for the use of military vessels only. 803: Which buoy will NOT display white retroreflective material?
N a. Safe water mark N b. Isolated danger mark Y c. Preferred channel mark N d. Daymark of no lateral significance 808: On a working copy of a weather map, a stationary front is represented by which color line?
N a. Red N b. Blue Y c. Alternating red and blue N d. Purple 816: Cyclones that have warm sectors usually move __________.
N a. westerly Y b. parallel to the isobars in the warm sector N c. toward the nearest high pressure area N d. faster than the accompanying cold front 874: Altocumulus clouds are defined as __________.
N a. high clouds Y b. middle clouds N c. low clouds N d. vertical development clouds 875: Sidereal hour angle is always __________.
N a. measured westward from the hour circle containing the first point of Aries N b. measured from the point on the celestial sphere occupied by the Sun at the vernal equinox N c. subtracted from the LHA of the star to obtain the LHA of Aries Y d. All of the above 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 890: If several navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List?
N a. Rhythm N b. Period Y c. Intensity N d. Color 954: A thin, whitish, high cloud popularly known as "mares' tails" is __________.
N a. altostratus N b. stratus N c. cumulus Y d. cirrus 1011: You are underway in the North Sea on course 127°T. You sight a buoy with the topmarks shown bearing two points on the starboard bow. Which action must be taken? (D025NG )
N a. Alter course to starboard until the buoy is at least two points on the port bow, then hold course. N b. Alter course to port until the buoy is broad on the starboard quarter, then hold course. N c. Change course to have the buoy close aboard either side. Y d. Ensure the bearings change to the right. 1128: In 1981, when would Jupiter and Saturn be visible in temperate latitudes for both evening and morning stars?
N a. 10 January Y b. 27 March N c. 22 June N d. 8 October 1163: The total magnetic effects which cause deviation of a vessel's compass can be broken down into a series of components which are referred to as __________.
N a. divisional parts Y b. coefficients N c. fractional parts N d. equations 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 1183: The principal purpose of magnetic compass adjustment is to __________.
N a. reduce the variation as much as possible Y b. reduce the deviation as much as possible N c. reduce the magnetic dip as much as possible N d. allow the compass bowl to swing freely on its gimbals 1193: If a ship is proceeding towards the magnetic equator, the uncorrected deviation due to permanent magnetism __________.
N a. increases N b. remains the same Y c. decreases N d. is unimportant and may be neglected 1215: Daylight savings time is a form of zone time that adopts the time __________.
N a. two zones to the east N b. two zones to the west Y c. one zone to the east N d. one zone to the west 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 1315: What is a lighted safe water mark fitted with to aid in its identification?
N a. Red and white retroreflective material N b. A sequential number Y c. A spherical topmark N d. A red and white octagon 1352: Weather observations provided by each weather station include all of the following except __________.
N a. temperature N b. visibility Y c. predicted weather for the next twelve hours N d. barometric pressure and change in the last three hours 1360: Which type of cloud is composed entirely of ice crystals and is found at very high altitudes?
N a. Cumulus Y b. Cirrus N c. Stratus N d. Nimbostratus 1435: Inferior conjunction is possible for __________.
N a. Mars Y b. Venus N c. Saturn N d. Jupiter 1510: During daylight savings time the meridian used for determining the time is located farther __________.
N a. west Y b. east N c. east in west longitude and west in east longitude N d. west in west longitude and east in east longitude 1587: In general, the most effective period for observing stars and planets occurs during the darker limit of __________.
N a. sunset Y b. civil twilight N c. nautical twilight N d. astronomical twilight 1597: The dense black cumulonimbus clouds surrounding the eye of a hurricane are called __________.
N a. spiral rainbands Y b. cloud walls N c. funnel clouds N d. cyclonic spirals 1602: Most modern Loran-C receivers automatically detect secondary station blink which __________.
N a. indicates the station is transmitting normally N b. automatically shuts down the receiver Y c. triggers alarm indicators to warn the operator N d. causes the receiver to shift automatically to another Loran chain 1653: In a weather report, the term "visibility" expresses __________.
N a. how far you can see with the "naked eye" N b. how far you can see with a telescope or binoculars N c. how well you can identify an object at night Y d. the distance in miles at which prominent objects are identifiable 1741: The left half of the storm is called the navigable semicircle because __________.
N a. the wind speed is decreased by the storm's forward motion N b. the wind tends to blow vessels away from the storms track Y c. Both A and B N d. Neither A nor B 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 1753: On a weather map, a large letter "H" means __________.
Y a. a high pressure area with cool, dry air, and fair weather N b. a high pressure area with warm, moist air, and inclement weather N c. horse latitudes, with rough seas and strong winds N d. a heavy squall line near the "H" 1793: Which weather element cannot be measured accurately while on board a moving vessel?
N a. relative humidity N b. temperature Y c. true wind speed N d. atmospheric pressure 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 2122: A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) __________.
Y a. fix N b. running fix N c. estimated position N d. dead-reckoning position 2144: Yesterday your chronometer read 02h 59m 58s at the 1500 GMT time tick. Today the chronometer reads 03h 00m 02s at the 1500 GMT time tick. What is the chronometer error?
Y a. 02s fast N b. 03h 00m 02s fast N c. +3s N d. -3s 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 2183: 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. Three red lights N b. Two red lights Y c. One red light N d. No light 2183: 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. Three red lights N b. Two red lights Y c. One red light N d. No light 2244: Capella is found in what constellation?
N a. Gemini Y b. Auriga N c. Libra N d. Crab 2298: The period of rotation of the Moon on its axis is __________.
N a. about 19 years N b. 365 days Y c. about 27.3 days N d. 24 hours 2390: You are in a channel in U.S. waters near an industrial plant with a load/discharge facility for barges. You hear a siren being sounded at the facility. What does this indicate?
Y a. There is danger at the facility due to a fire or cargo release. N b. A towboat with a hazardous cargo barge is being moved to or from the facility. N c. The facility is warning a barge to shut down transfer operations due to weather conditions (electrical storms, tornado, etc.). N d. A barge at the facility has commenced loading or discharging operations. 2478: On 23 August 1981 you observe a back sight of the lower limb of the Sun. The sextant altitude (hs) is 116°42.8'. The height of eye is 56 feet and the index error is 2.0' on the arc. What is the observed altitude (Ho)?
Y a. 63°42.0' N b. 63°38.0' N c. 63°19.4' N d. 62°49.6' 2529: A bridge over a navigable waterway is being repaired. There is a traveler platform under the bridge's deck that significantly reduces the vertical clearance. If required by the CG district commander, how will this be indicated at night?
N a. Illumination by flood lights Y b. A quick flashing red light at each lower corner N c. A strobe light visible both up and downstream N d. Fixed amber lights under the extreme outer edges of the traveler 2585: The letter D as shown represents the __________. (D006NG )
N a. visible horizon Y b. geometrical horizon N c. sensible horizon N d. celestial horizon 2741: A general chart could have a scale of __________.
Y a. 1:200,000 N b. 1:1,000,000 N c. 1:50,000 N d. not more than 1:25,000 2776: For a well made and well maintained sextant, the maximum value of which correction is usually so small that it can be ignored?
N a. Personal correction Y b. Instrument correction N c. Phase N d. Dip correction 2778: A special daymark is a __________.
N a. red-and-white octagon N b. daymark with a yellow stripe on it N c. green square Y d. yellow diamond 2790: A towboat has the same draft as the barges it is pushing ahead. If the distance from the stern of the towboat to the head of the tow is 800 feet, where is the approximate location of the pivot point of the unit?
N a. At the head of the tow Y b. 250 feet from the head of the tow N c. 400 feet from the head of the tow N d. 600 feet from the head of the tow 2800: Where is the pivot point of a towboat with a tow ahead?
N a. One-third the length of the combined unit forward of the towboat Y b. One-third the length of the combined unit back from the head N c. At the head of the towboat N d. One-half the length of the combined unit 2920: Navigation charts of the Upper Mississippi River are published by __________.
N a. National Ocean Service N b. Lake Survey Y c. Corps of Engineers, U.S. Army N d. U.S. Coast Guard