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 10: The wind at Frying Pan shoals has been northwesterly at an average velocity of 22 knots. The predicted set and drift of the rotary current are 125° at 0.6 knot. What current should you expect?
Y a. 119° at 0.9 knot N b. 172° at 1.1 knots N c. 225° at 0.6 knot N d. 340° at 0.4 knot 106: A local wind which occurs during the daytime and is caused by the different rates of warming of land and water is a __________.
N a. foehn N b. chinook N c. land breeze Y d. sea breeze 176: Which wind pattern has the most influence over the movement of frontal weather systems over the North American continent?
N a. Subpolar easterlies N b. Northeast trades Y c. Prevailing westerlies N d. Dominant southwesterly flow 193: In using Loran-C, skywave reception gives greater range but is __________.
N a. only accurate during daylight hours Y b. much less accurate N c. only accurate at twilight N d. more accurate than using ground waves 195: The equation of time is 8m 00s. The mean Sun is ahead of the apparent Sun. If you are 2°W of the central meridian of your time zone, when will the apparent Sun cross your meridian?
Y a. 1216 N b. 1208 N c. 1200 N d. 1152 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 221: In United States waters, a buoy having red and white vertical stripes has a light characteristic of __________.
N a. group occulting Y b. Morse (A) N c. interrupted quick flashing N d. quick flashing 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 251: A mid-channel buoy, if lighted, will show a __________.
N a. fixed red light Y b. Morse (A) white light N c. green light N d. flashing red light 253: Loran-C is which type of system?
N a. Reflected electron N b. Electrical radiation N c. Quarterpoint electrical navigation Y d. Hyperbolic radio navigation 258: You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.
N a. cirrus clouds N b. long swells N c. smoother seas and warmer water Y d. steeper waves, closer together 267: 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. Y b. Alter course to the left until the range closes, then steer to the left of 306°T. N c. Alter course to the left to close the range, then alter course to 309°T. N d. Maintain course as it is normal for the range to open as you get close. 348: When using a radar in an unstabilized mode, fixes are determined most easily from __________.
N a. center bearings N b. tangent bearings N c. objects that are close aboard Y d. ranges 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 490: You are underway on course 050°T and your maximum speed is 10 knots. The eye of a hurricane bears 100°T, 90 miles from your position. The hurricane is moving towards 285°T at 19 knots. Which course should you steer at 10 knots to have the maximum CPA?
N a. 221° Y b. 226° N c. 233° N d. 238° 536: You are enroute from Puerto Rico to New York. A hurricane makes up and is approaching. If the wind veers steadily, this indicates that your vessel is __________.
Y a. in the dangerous semicircle N b. in the navigable semicircle N c. directly in the path of the storm N d. in the storm center 560: On 14 April 1981, a back sight is observed of the lower limb of the Sun. The height of eye is 45 feet. The index error is 2.5' on the arc. The sextant altitude (hs) is 117°14.6'. What is the observed altitude (Ho)?
N a. 63°01.9' N b. 63°03.4' N c. 63°07.4' Y d. 63°09.9' 638: Swell is the rise and fall of the ocean's surface due to __________.
N a. fetch Y b. distant winds N c. local storms N d. the pull of the moon 650: What classification of tropical cyclone would have closed isobars, counter clockwise rotary circulation, and sustained winds between 34 and 63 knots?
N a. A tropical disturbance N b. A tropical depression Y c. A tropical storm N d. A hurricane 690: What level of development of a tropical cyclone has a hundred mile radius of circulation, gale force winds, less than 990 millibars of pressure and vertically formed cumulonimbus clouds?
N a. A tropical disturbance N b. A tropical depression Y c. A tropical storm N d. A typhoon 706: A steep barometric gradient indicates __________.
N a. calms N b. light winds Y c. strong winds N d. precipitation 767: What describes a flood current?
N a. Horizontal movement of the water toward the land after high tide Y b. Horizontal movement of the water toward the land after low tide N c. Horizontal movement of the water away from the land following high tide N d. Horizontal movement of the water away from the land following low tide 784: Variation is the angular measurement between __________.
N a. compass north and magnetic north N b. compass north and true north Y c. magnetic meridian and the geographic meridian N d. your vessel's heading and the magnetic meridian 785: An amplitude of the Sun in high latitudes __________.
N a. is most accurate before sunrise N b. is most accurate after sunset N c. should only be observed when the Sun's lower limb is above the horizon Y d. is most accurate when the Sun's center is observed on the visible horizon 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 871: Under the IALA-A Buoyage System, a buoy marking the starboard side of the channel when approaching from seaward must have a(n) __________.
N a. pillar shape Y b. green color N c. square topmark N d. even number 939: That half of the hurricane to the right hand side of its track (as you face the same direction that the storm is moving) in the Northern Hemisphere is called the __________.
N a. windward side N b. leeward side N c. safe semicircle Y d. dangerous semicircle 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 1008: The Light List indicates that a light has a nominal range of 18 miles and is 38 feet high. If the visibility is 6 miles and your height of eye is 15 feet, at which distance will you sight the light?
N a. 18.0 nm N b. 14.8 nm Y c. 11.7 nm N d. 6.0 nm 1017: Which statement(s) concerning the effect of Coriolis force on ocean currents is(are) correct?
N a. The deflection of the current is to the left in the Northern Hemisphere. N b. The Coriolis force is greater in the lower latitudes. Y c. The Coriolis force is more effective in deep water. N d. All of the above 1028: At what angle to the isobars do surface winds blow over the open sea?
N a. About 90° N b. About 50° N c. About 25° Y d. About 15° 1354: A ship is in longitude 54°00'W on a true course of 090°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?
N a. 45°00'W Y b. 52°30'W N c. 60°00'W N d. 67°30'W 1357: You will transit the Cape Cod Canal on 7 November 1983. If you arrive at the R R Bridge at 1655 EST (ZD +5), for what period of time during your transit will you have currents of not more than 0.5 knot?
N a. 1631 to 1719 N b. 1638 to 1655 Y c. 1648 to 1702 N d. 1655 to 1709 1359: The distance in longitude from the intersection of a great circle and the equator to the lower vertex is how many degrees of longitude?
N a. 45° Y b. 90° N c. 135° N d. 180° 1373: The reaction of a gyrocompass to an applied force is known as __________.
Y a. precession N b. earth rate N c. gyroscopic inertia N d. gravity effect 1435: Inferior conjunction is possible for __________.
N a. Mars Y b. Venus N c. Saturn N d. Jupiter 1442: A great circle track provides the maximum saving in distance on __________.
Y a. easterly courses in high latitudes N b. southerly courses in high latitudes N c. westerly courses in low latitudes N d. easterly courses in low latitudes that cross the equator 1503: A radar range to a small, charted object such as a light will provide a line of position in which form?
N a. Straight line Y b. Arc N c. Parabola N d. Hyperbola 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 1581: Shown are the symbols used on radio facsimile weather charts. The symbol indicated at letter "I" represents __________. (D042NG )
N a. rain showers Y b. thunderstorms N c. snow storms N d. sand storms 1742: In the Northern hemisphere which semicircle of a hurricane is the navigable semicircle?
Y a. Left N b. Right N c. Front N d. Back 1799: The letter D in illustration D006NG represents the __________.
N a. celestial horizon N b. visible horizon Y c. geometrical horizon N d. geoidal horizon 1859: While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers this is a __________.
N a. special purpose signal N b. passing daymark Y c. crossing daymark N d. cable crossing 1892: The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.
N a. lower low water N b. low water N c. tide level Y d. high water 2004: The velocity of the wind, its steady direction, and the amount of time it has blown determines a wind driven current's __________.
N a. temperature N b. density N c. deflection Y d. speed 2022: The GP of a body for a high altitude sight is determined from the declination and the __________.
N a. right ascension N b. sidereal hour angle Y c. Greenwich hour angle N d. observed altitude 2072: The Illustration represents a movable dam. If a bear trap is open what will be displayed at the lock to indicate this condition? (D037NG )
Y a. An amber light under a red light N b. A white square N c. A green triangle N d. A yellow pentagon 2170: The temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur is referred to as the __________.
N a. precipitation point N b. vapor point Y c. dew point N d. absolute humidity 2220: A dead reckoning (DR) plot __________.
N a. must utilize magnetic courses N b. must take set and drift into account N c. should be replotted hourly Y d. should be started each time the vessel's position is fixed 2314: A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. What action should be taken to remove this error during compass adjustment?
N a. If the blue ends of the magnets are forward you should raise the fore-and-aft tray. N b. If the blue ends of the magnets are aft you should lower the fore-and-aft tray. Y c. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the top, you should add some magnets. N d. If the blue ends of the magnets are aft, and the fore-and-aft tray is at the bottom, you should reverse the magnets. 2341: Which statement concerning illustration D010NG is correct? (Soundings and heights are in meters)
N a. Maury Lightship swings about her anchor on a circle with a 21-meter diameter. N b. The position of the lightship is indicated by the center of the star on the symbol's mast. Y c. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. N d. There is a 12-meter deep hole inside the 5-meter curve just west of Beito Island. 2344: 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 latitude N b. Diurnal libration N c. Physical libration Y d. Horizontal libration 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' 2609: The letter A in illustration D006NG represents the __________. (D006NG )
N a. geoidal horizon N b. celestial horizon N c. visible horizon Y d. sensible horizon 2762: You take a bearing of 176° of a lighthouse. Which bearing of another object would give the best fix?
Y a. 079° N b. 151° N c. 176° N d. 292° 2770: What is most likely to happen when you push a multiple tow into a countercurrent?
N a. Going upstream you will make better speed with no danger involved. N b. Going downstream you will be slowed down but will keep control of the tow. Y c. There is a good chance you will break up the tow. N d. No danger exists as long as you steer a straight course through the eddy. 2816: The length of a wave is the length __________.
N a. of the wave's crest N b. of the wave's trough N c. measured from crest to trough Y d. measured from crest to crest 3025: You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________.
Y a. estimated position N b. dead-reckoning position N c. fix N d. running fix 3090: NOAA VHF weather reports are continuously broadcast on VHF channels WX-1, WX-2 and WX-3 on a frequency of __________.
N a. 156.8, 157.1, 162.55 MHz N b. 162.55, 162.00, 171.5 KHz Y c. 162.55, 162.40, 162.475 MHz N d. 2182, 2638, 2670 KHz