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 41: Mean high water is the reference plane used for __________.
N a. all vertical measurements Y b. heights above water of land features such as lights N c. soundings on the East and West Coasts N d. water depths on the East Coast only 76: In the Northern Hemisphere, a wind that shifts counterclockwise is a __________.
N a. veering wind Y b. backing wind N c. reverse wind N d. chinook wind 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 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 159: The apparent wind can be zero when the true wind is from __________.
N a. ahead and equal to the ship's speed Y b. astern and equal to the ship's speed N c. ahead and equal to twice the ship's speed N d. astern and equal to twice the ship's speed 205: The difference between local apparent time (LAT) and local mean time (LMT) is indicated by the __________.
Y a. equation of time N b. difference of longitude between the local and central meridian in time units N c. longitude in time units N d. zone description 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 275: Which statement concerning illustration is correct? (Soundings and heights are in meters) (D010NG )
Y a. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. N b. There is a 12-meter deep hole inside the 5-meter curve just west of Beito Island. N c. The position of the lightship is indicated by the center of the star on the symbol's mast. N d. Maury Lightship swings about her anchor on a circle with a 21-meter diameter. 279: As a vessel changes course to starboard, the compass card in a magnetic compass __________.
Y a. remains aligned with compass north N b. also turns to starboard N c. first turns to starboard then counterclockwise to port N d. turns counterclockwise to port 295: The difference (measured in degrees) between the GHA of the body and the longitude of the observer is the __________.
N a. right ascension Y b. meridian angle N c. SHA of the observer N d. zenith distance 512: On a gnomonic chart, a great circle track between Los Angeles and Brisbane will appear as a __________.
N a. loxodromic curve N b. curved line concave to the equator Y c. straight line N d. spiral approaching the poles as a limit 543: A radar display which is oriented, so that north is always at the top of the screen, is called a(n) __________.
N a. relative display N b. composite display Y c. stabilized display N d. unstabilized display 665: 17 degrees of latitude is equal to __________.
N a. 68 miles N b. 510 miles Y c. 1020 miles N d. 4080 miles 702: Which publication contains information on navigation regulations, landmarks, channels, anchorages, tides, currents, and clearances of bridges for Chesapeake Bay?
Y a. Coast Pilot N b. Light List N c. Sailing Directions N d. Pilot Charts 733: What would give the best radar echo?
N a. The beam of a three masted sailing vessel with all sails set. N b. A 110-foot fishing vessel with a radar reflector in its rigging. N c. A 300-foot tanker, bow on. Y d. A 600-foot freighter, beam on. 737: What describes an ebb current?
N a. Horizontal movement of the water away from the land following low tide N b. Horizontal movement of the water toward the land following low tide Y c. Horizontal movement of the water away from the land following high tide N d. Horizontal movement of the water toward the land following high tide 756: What is a common unit of measure for atmospheric pressure?
N a. centimeters Y b. Inches N c. Degrees N d. Feet 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 804: A relative bearing is always measured from __________.
N a. true north N b. magnetic north N c. the vessel's beam Y d. the vessel's head 852: What is published by the U.S. Coast Guard?
Y a. Light List N b. Nautical Charts N c. Tide Tables N d. U.S. Coast Pilot 859: At 1800 ZT on 31 October, your position is LAT 24°50'N, LONG 92°37'W. You are preparing a weather report form, WS Form B-80. How should you encode the first three groups after the call sign if you estimate the wind? (D041NG )
N a. 31123, 99929, 70249 N b. 31183, 99249, 79237 N c. 31243, 99249, 70926 Y d. 01003, 99248, 70926 864: Uniform, grayish-white cloud sheets that cover large portions of the sky, and are responsible for a large percentage of the precipitation in the temperate latitudes, are called __________.
Y a. altostratus N b. altocumulus N c. cirrostratus N d. cirrocumulus 877: Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the __________.
N a. Alaska Current N b. Subarctic Current N c. Kuroshio Current Y d. Oyashio Current 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 894: On a clear, warm day, you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead __________.
Y a. it will be preceded by a sudden increase in wind speed N b. it will be preceded by a sudden decrease in wind speed N c. the wind speed will not change as it passes N d. the wind will back rapidly to left in a counterclockwise direction as it passes 898: At 1200 ZT, on 31 July, your position is LAT 24°33'N, LONG 173°05'W. You are preparing a weather report form, WS Form, B-80. How should you encode the first three groups after the call sign if you estimate the wind? (D041NG )
Y a. 01003, 99245, 71731 N b. 01243, 92433, 71731 N c. 31243, 99245, 71731 N d. 31003, 92433, 71730 907: In which month will the equatorial counter current be strongest?
N a. January N b. April Y c. August N d. October 1044: The dry-bulb temperature is 78°F and the wet-bulb temperature is 62°F. What is the relative humidity?
N a. 16% N b. 24% Y c. 39% N d. 79% 1057: One of the causes of ocean currents is density differences in the water. This is true because __________.
N a. in an area of high density the water's surface is lower than in an area of low density Y b. surface water flows from an area of high density to one of low density N c. the lesser the density gradient the freer the water is to move N d. it is the density differences that cause the currents to stay in the troughs 1073: Chart legends printed in capital letters show that the associated landmark is __________.
N a. inconspicuous N b. a radio transmitter Y c. conspicuous N d. a government facility or station 1074: As the temperature for a given mass of air increases, the __________.
N a. dew point increases N b. dew point decreases N c. relative humidity increases Y d. relative humidity decreases 1200: You want to transit Pollock Rip Channel, MA, on 6 April 1983. What is the period of time around the 0955 (ZD +5) slack in which the current does not exceed 0.3 knot?
N a. 0911 to 0955 N b. 0940 to 1010 N c. 0955 to 1044 Y d. 0935 to 1017 1293: Deviation is caused by __________.
N a. changes in the earth's magnetic field N b. nearby magnetic land masses or mineral deposits Y c. magnetic influence inherent to that particular vessel N d. the magnetic lines of force not coinciding with the lines of longitude 1332: The longitude of the upper vertex of a great circle track is 169°E. What is the longitude of the lower vertex?
N a. 076°E N b. 169°W N c. 101°W Y d. 011°W 1343: Variation is a compass error that you __________.
N a. can correct by adjusting the compass card N b. can correct by adjusting the compensating magnets N c. can correct by changing the vessel's heading Y d. cannot correct 1455: Inferior conjunction is possible for __________.
Y a. Mercury N b. Saturn N c. Mars N d. Jupiter 1584: A decrease in barometric pressure is associated with all of the following except __________.
N a. rising warm air N b. proximity to a low pressure area N c. inward spiraling circulation Y d. clear dry weather 1699: In the Northern Hemisphere, when the center of a high pressure system is due east of your position, you can expect winds from the __________.
N a. south to west Y b. south to east N c. north to west N d. north to east 1772: The GP of a body for a high altitude sight is determined from the declination and the __________.
Y a. Greenwich hour angle N b. azimuth N c. zenith distance N d. right ascension 1798: The climate of the northern Gulf coast __________.
N a. is humid and subtropical throughout the year N b. has an east coast marine type of climate Y c. is a warm marine type of climate N d. varies from warm to subtropical 1829: 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 E in the illustration? (D036NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No light 1840: A vessel heading NW is on a course of __________.
N a. 274.5° N b. 292.5° Y c. 315.0° N d. 337.5° 1941: IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________.
N a. red can buoy N b. red conical buoy N c. green can buoy Y d. green conical buoy 1942: In the horizon system of coordinates what is equivalent to the declination of the equator system?
N a. Nadir N b. Azimuth angle Y c. Altitude N d. Zenith distance 2010: A vessel heading ESE is on a course of __________.
Y a. 112.5° N b. 135.0° N c. 157.5° N d. 180.0° 2067: The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 5 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
Y a. 6.3 miles N b. 7.4 miles N c. 8.4 miles N d. 9.0 miles 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 2119: Which stock number indicates an NGA (NIMA) chart designed for fixing positions at sea and DR plotting while on a long voyage?
Y a. WOAGN520 N b. PILOT16 N c. 16BCO16212 N d. WOPZC5245 2129: 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?
N a. No lights Y b. Three red lights N c. Two red lights N d. One red light 2130: You are underway and pass by a lighthouse. Its light, which was white since you first sighted it, changes to red. This means __________.
N a. the light is characterized as alternately flashing N b. the lighthouse has lost power and has switched to emergency lighting N c. it is the identifying light characteristic of the lighthouse Y d. you have entered an area of shoal water or other hazard 2174: By convention, the Earth's north magnetic pole is colored __________.
N a. red N b. white Y c. blue N d. black 2440: You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse?
N a. 003° N b. 227° Y c. 177° N d. 363° 2514: Sidereal time is NOT used __________.
N a. as the basis for star charts N b. to enter a star finder N c. in sight reduction using Pub 249 Y d. in sight reductions of planet observations 2652: The dividing meridian between zone descriptions -10 and -11 is __________.
N a. 135°30'E N b. 145°00'E N c. 150°00'E Y d. 157°30'E 2737: A lateral system buoy displaying a quick light __________.
N a. should be passed close aboard on either side Y b. indicates that special caution is required N c. is used at a channel bifurcation or junction N d. is painted with red and white vertical stripes 2876: On 13 November 1981 you observe a back sight of the lower limb of the Sun. The sextant altitude (hs) is 109°23.6'. The height of eye is 66 feet, and the index error is 2.0' off the arc. What is the observed altitude (Ho)?
N a. 71°01.2' Y b. 70°57.2' N c. 70°45.4 N d. 70°26.4' 2945: A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) __________.
Y a. estimated position N b. dead reckoning position N c. fix N d. None of the above 3078: Which data must ECDIS be able to record at one-minute intervals?
N a. Position N b. Electronic navigational chart source N c. Course made good history Y d. All of the above 3115: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?
Y a. Time stamp N b. Destination N c. Location of antenna N d. None of the above