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 18: A vessel's position should be plotted using bearings of __________.
N a. buoys close at hand Y b. fixed known objects on shore N c. buoys at a distance N d. All of the above 62: Charted depth is the __________.
N a. vertical distance from the chart sounding datum to the ocean bottom, plus the height of tide Y b. vertical distance from the chart sounding datum to the ocean bottom N c. average height of water over a specified period of time N d. average height of all low waters at a place 67: What is the definition of height of tide?
Y a. The vertical distance from the tidal datum to the level of the water at any time N b. The vertical difference between the heights of low and high water N c. The vertical difference between a datum plane and the ocean bottom N d. The vertical distance from the surface of the water to the ocean floor 84: When using an echo sounder in deep water, it is NOT unusual to __________.
Y a. receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night N b. receive a first return near the surface during the day, and a strong return at about 200 fathoms (366 meters) at night N c. receive false echoes at a constant depth day and night N d. have to recalibrate every couple of days due to inaccurate readings 102: Which statement about an NGA (NIMA) chart with stock no.23BHA23433 is TRUE?
N a. This is a non-navigational or special purpose chart. N b. It is not included in the portfolio. Y c. It is a chart of an area in subregion 23. N d. It depicts a major portion of an ocean. 111: Green lights may appear on __________.
Y a. horizontally banded buoys N b. vertically striped buoys N c. yellow buoys N d. spherical buoys 135: The standard meridian for the time zone +1 is __________.
N a. 0° N b. 7 1/2°W Y c. 15°W N d. 7 1/2°E 161: How is a safe water mark, that can be passed close aboard on either side, painted and lighted?
N a. Black and white stripes with an interrupted quick flashing light N b. Black and red stripes with a Morse (A) light N c. Black and red stripes with an interrupted quick flashing light Y d. Red and white stripes with a Morse (A) light 217: In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n) __________.
N a. apogean tide Y b. double high water N c. perigean tide N d. bore 231: You are outbound in a buoyed channel on course 015°T. You sight a white light showing a Morse (A) characteristic bearing 359° relative. For safety, you should __________.
N a. change course to 359°T to pass near to the buoy Y b. stay in the channel and leave the buoy to port N c. alter course to 000°T and leave the buoy well clear to starboard N d. check the chart to see where the marked danger lies in relation to the buoy 245: Yesterday you took a time tick using the 1200 GMT broadcast, and the chronometer read 11h 59m 59s. Today at the 1200 GMT time tick the chronometer read 00h 00m 01s. What is the chronometer error?
N a. Gaining 2 seconds N b. Losing 2 seconds N c. Fast 2 seconds Y d. Fast 1 second 328: The direction of prevailing winds in the Northern hemisphere is caused by the __________.
N a. magnetic field at the North Pole N b. Gulf Stream Y c. Earth's rotation N d. Arctic cold fronts 357: On 10 August 1983 you will dock near Days Point, Weehawken, on the Hudson River, at 1800 DST (ZD +4). The charted depth alongside the pier is 24 feet (7.3 meters). What will be the depth of water when you dock?
N a. 23.5 feet (7.1 m) Y b. 23.9 feet (7.2 m) N c. 24.9 feet (7.5 m) N d. 26.3 feet (8.0 m) 371: Which buoy may be odd numbered?
N a. Mid-channel buoy N b. Unlighted nun buoy Y c. Lighted green buoy N d. All of the above 412: If you were sailing in the North Pacific and were interested in the ice and iceberg limits, you could find this information in the __________.
Y a. Pilot Chart N b. Coast Pilot N c. Notice to Mariners N d. None of the above 469: Where are the prevailing westerlies of the Southern Hemisphere located?
N a. Between the Equator and 10° latitude N b. Between 10° and 20° latitude Y c. Between 30° and 60° latitude N d. Between 60° and 90° latitude 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 597: You will be loading in Boston Harbor to a maximum draft of 32'06". The charted depth of an obstruction in the channel near Boston Light is 30 feet and you wish to have 3 feet of keel clearance. The steaming time from the pier to the obstruction is 01h 05m. What is the latest time (ZD +4) you can sail on 17 May 1983 and meet these requirements?
N a. 1610 Y b. 1728 N c. 1821 N d. 2350 614: A marine chronometer should be rewound once every __________.
N a. 12 hours Y b. day N c. 3 days N d. week 740: A very light breeze that causes ripples on a small area of still water is a __________.
Y a. cat's paw N b. hog's breath N c. williwaw N d. chinook 786: The greater the pressure difference between a high and a low pressure center, the __________.
N a. dryer the air mass will be N b. cooler the temperature will be Y c. greater the force of the wind will be N d. warmer the temperature will be 795: The path of a celestial body during its daily apparent revolution around the Earth is called its __________.
N a. ecliptic Y b. diurnal circle N c. altitude circle N d. circle of position 853: The standard magnetic compass heading differs from the true heading by __________.
Y a. compass error N b. latitude N c. variation N d. deviation 1043: You are about to go to sea and adjust the magnetic compass. To expedite the adjustment at sea, in what order should the following dockside adjustments be made?
N a. Flinders bar first, then the heeling magnet and spheres N b. Heeling magnet first, then the Flinders bar and spheres Y c. Flinders bar first, then the spheres and heeling magnet N d. Spheres first, then the Flinders bar and heeling magnet 1092: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. extension of the low pressure ridge Y b. wind circulation and forward motion of the storm N c. recurvature effect N d. direction of circulation and pressure gradient 1122: A barometer showing falling pressure indicates the approach of a __________.
N a. high pressure system Y b. low pressure system N c. high dew point N d. low dew point 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 1190: Which type of cloud is indicated by the number 2? (D039NG )
N a. Cumulus Y b. Cirrostratus N c. Stratocumulus N d. Altostratus 1237: What will be the velocity of the tidal current at Port Royal, VA, at 1505 DST (ZD +4) on 4 June 1983?
N a. 0.0 knot N b. 0.1 knot Y c. 0.4 knot N d. 0.7 knot 1279: For 3 November 1983, at 0830 EST (ZD +5) at Catskill, NY, what is the predicted height of tide?
N a. +0.1 foot (+0.0 m) Y b. -0.6 foot (-0.2 m) N c. +0.9 foot (+0.3 m) N d. -1.3 feet (-0.4 m) 1334: The Illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "H" represents __________. (D042NG )
N a. ice N b. snow N c. rain Y d. hail 1348: Vessel required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
Y a. speed of the vessel over the ground or through the water N b. distance to the next port N c. time of the next navigational satellite pass N d. None of the above 1348: Vessel required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
Y a. speed of the vessel over the ground or through the water N b. distance to the next port N c. time of the next navigational satellite pass N d. None of the above 1455: Inferior conjunction is possible for __________.
Y a. Mercury N b. Saturn N c. Mars N d. Jupiter 1611: What indicates a dual purpose buoy?
N a. Red buoy with a horizontal yellow band N b. Red and white vertically-striped buoy with a vertical yellow stripe N c. Red and white vertically-striped buoy with a red spherical topmark Y d. Green buoy with a yellow square 1674: The letter D in illustration D006NG represents the __________.
N a. visible horizon Y b. geometrical horizon N c. celestial horizon N d. geoidal horizon 1707: "Surface circulation" is another term for __________.
N a. cyclones N b. air in motion at all levels of the atmosphere Y c. wind in the lower troposphere N d. ocean currents 1724: What is the first visible indication of the presence of a tropical cyclone or hurricane?
N a. Stratocumulus clouds or strange birds N b. Rain and increasing winds Y c. An exceptionally long swell N d. Dark clouds and the "bar" of the storm 1841: The letter A as shown represents the __________. (D006NG )
Y a. sensible horizon N b. geoidal horizon N c. visible horizon N d. celestial horizon 1902: Under the numbering system used by NGA (NIMA), a four digit number is used for __________.
N a. large scale charts of infrequently navigated areas such as the polar regions N b. charts of rivers or canal systems such as the Ohio River or Erie Canal Y c. non-navigational materials, such as a chart correction template or maneuvering board N d. foreign charts reproduced by NGA (NIMA) 1987: An instrument useful in predicting fog is the __________.
Y a. sling psychrometer N b. microbarograph N c. anemometer N d. aneroid barometer 2166: 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. One amber light Y b. Three red lights N c. Two red lights N d. One red light 2262: The Milky Way is an example of a __________.
N a. cluster Y b. galaxy N c. nova N d. nebula 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 2462: Under ideal viewing conditions, the dimmest star that can be seen with the unaided eye is of what magnitude?
N a. First N b. Third N c. Fourth Y d. Sixth 2462: Under ideal viewing conditions, the dimmest star that can be seen with the unaided eye is of what magnitude?
N a. First N b. Third N c. Fourth Y d. Sixth 2492: A star that suddenly becomes several magnitudes brighter and then gradually fades is a __________.
N a. double star N b. variable star Y c. nova N d. nebula 2502: The major factor that causes the color difference between a red star (Betelgeuse) and a blue star (Rigel) is __________.
Y a. its surface temperature N b. the elevation above the horizon N c. the mass of the star N d. the contrast to nearby stars 2506: Which is TRUE on the Western Rivers when a vessel downbound with a following current is meeting an upbound vessel?
Y a. She has the right of way only if she is a power-driven vessel. N b. She has the right of way only if she has a tow. N c. She does not have the right of way, since the other vessel is not crossing the river. N d. She must wait for a whistle signal from the upbound vessel. 2619: In low latitudes, a first quarter Moon will always rise at about __________.
N a. sunrise Y b. 1200 LMT N c. sunset N d. 2400 LMT 2752: A daymark used to indicate the safe water in a channel will have which of the shapes shown? (D045NG )
N a. A N b. B Y c. C N d. D 2766: In low latitudes, the high(s) of the diurnal variation of pressure occur(s) at __________.
N a. noon N b. noon and midnight Y c. 1000 and 2200 N d. 1600 2822: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 2 seconds after the signal was sounded. What is the distance to the shore?
Y a. 360 yards N b. 320 yards N c. 280 yards N d. 140 yards 2841: You are required to enter a lock on your voyage. Information on the lock regulations, signals, and radio communications can be found in __________.
Y a. Coast Pilot N b. Corps of Engineer Information Bulletin N c. Bowditch N d. the publication "Key to the Locks" 2892: The Light List indicates that a dayboard is a type NB. You should __________.
N a. see a black triangle N b. look for another daymark forming a range Y c. expect a daymark of no lateral significance N d. check to enter the correct channel at the junction daymark 2910: You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________.
N a. 60° N b. 45° Y c. 90° N d. 30° 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 2931: The vertical distance from the tidal datum to the level of the water is the __________.
N a. range of tide Y b. height of tide N c. actual water depth N d. charted depth 3068: Which of the following data layer categories is NOT displayed on ECDIS?
N a. Notice to Mariners information N b. ECDIS warnings and messages Y c. Ship hydrodynamic information N d. Hydrographic Office data