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.
51: In the U.S. Aids to Navigation System, red and green horizontally-banded buoys mark __________.
N a. channels for shallow draft vessels N b. general anchorage areas N c. fishing grounds Y d. junctions or bifurcations 55: Your longitude is 179°59'W. The LMT at this longitude is 23h 56m on the 4th day of the month. Six minutes later, your position is 179°59'E longitude. Your LMT and date are __________.
N a. 00h 02m on the 4th N b. 00h 02m on the 5th N c. 23h 50m on the 5th Y d. 00h 02m on the 6th 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 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 114: All echo-sounders can measure the __________.
N a. actual depth of water Y b. actual depth of water below keel N c. average depth from waterline to hard bottom N d. average depth of water to soft bottom 158: Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, the current could be __________.
N a. with you at 10 knots N b. against you at 10 knots Y c. slack N d. with you at 2 knots 191: Safe water buoys may show ONLY __________.
N a. flashing red lights N b. flashing green lights Y c. white lights N d. yellow lights 247: Neap tides occur __________.
N a. at the start of spring, when the Sun is nearly over the equator N b. only when the Sun and Moon are on the same sides of the Earth and are nearly in line Y c. when the Sun and Moon are at approximately 90° to each other, as seen from the Earth N d. when the Sun, Moon, and Earth are nearly in line, regardless of alignment order 315: Which statement about the time diagram shown DO08NG is TRUE?
N a. You are in west longitude. N b. Your date is ahead of Greenwich. Y c. The meridian angle of the Sun is east. N d. The GHA of the Sun is less than 180°. 337: To predict the actual depth of water using the Tide Tables, the number obtained from the Tide Tables is __________.
N a. the actual depth Y b. added to or subtracted from the charted depth N c. multiplied by the charted depth N d. divided by the charted depth 337: To predict the actual depth of water using the Tide Tables, the number obtained from the Tide Tables is __________.
N a. the actual depth Y b. added to or subtracted from the charted depth N c. multiplied by the charted depth N d. divided by the charted depth 363: Your dead reckoning position should be plotted __________.
N a. whenever an estimated position is plotted N b. when it agrees with your loran position N c. when coming on or going off soundings Y d. at least every hour on the hour in the open waters of the sea 418: In most cases, the direction of the apparent wind lies between the bow and __________.
Y a. the direction of the true wind N b. true north N c. the beam on the windward side N d. the beam on the lee side 442: In very high latitudes, the most practical chart projection is the __________.
N a. Mercator N b. gnomonic N c. azimuthal Y d. Lambert conformal 757: The term "flood current" refers to that time when the water __________.
Y a. is flowing towards the land N b. is moving towards the ocean N c. level is not changing N d. level is rising because of heavy rains 801: You are entering an African port and see ahead of you a red can-shaped buoy. What action should you take?
Y a. Alter course to leave the buoy to port N b. Alter course to leave the buoy to starboard N c. Pass the buoy close aboard on either side N d. Pass the buoy well clear on either side 837: The Brazil Current flows in which general direction?
N a. Northwesterly Y b. Southwesterly N c. Southeasterly N d. Northerly 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 923: A magnetic compass card is marked in how many degrees?
N a. 90 N b. 180 Y c. 360 N d. 400 953: The magnetic compass operates on the principle that __________.
N a. like magnetic poles attract N b. unlike magnetic poles repel Y c. unlike poles attract N d. the poles of the compass line up with the geographic poles of the earth 1064: The dew point temperature is __________.
N a. always higher than the air temperature N b. always lower than the air temperature N c. equal to the difference between the wet and dry bulb temperatures Y d. the temperature at which the air is saturated with water vapor 1067: The two most effective generating forces of surface ocean currents are __________.
N a. temperature and salinity differences in the water Y b. wind and density differences in the water N c. water depth and underwater topography N d. rotation of the Earth and continental interference 1069: What do the numbers on isobars indicate?
Y a. barometric pressure N b. temperature N c. rain in inches N d. wind speed 1070: Chart legends which indicate a conspicuous landmark are printed in __________.
N a. underlined letters Y b. capital letters N c. italics N d. boldface print 1150: You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing?
Y a. 312° N b. 000° N c. 090° N d. 222° 1185: An orange and white buoy with a rectangle on it displays __________.
N a. directions N b. distances N c. locations Y d. All of the above 1191: You plot a fix using three lines of position and find they intersect in a triangle. The actual position of the vessel __________.
N a. is outside of the triangle N b. may be anywhere in the triangle Y c. may be inside or outside of the triangle N d. is the geometric center of the triangle 1396: On the approach of a warm front the barometric pressure usually __________.
Y a. falls N b. rises N c. is steady N d. is unreliable 1419: The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is __________.
Y a. nonmagnetic N b. weatherproof N c. corrosion resistant N d. capable of being permanently affixed to the vessel 1487: At the approaches to Savannah, GA, with the wind coming out of the west, the wind-driven current will be flowing approximately __________.
Y a. 080° N b. 100° N c. 260° N d. 280° 1609: A rapid rise or fall of the barometer indicates __________.
N a. heavy rain within six hours N b. a decrease in wind velocity Y c. a change in the present weather conditions N d. that fog will soon set in 1634: A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________.
Y a. red light N b. white light N c. green light N d. light characteristic of Morse (A) 1642: Which type of cloud formation should be of immediate concern to small craft operators?
N a. cirrus N b. altostratus N c. nimbostratus Y d. cumulonimbus 1663: What is the primary source of the earth's weather?
N a. The oceans N b. The moon Y c. The sun N d. The solar system 1677: The position labeled "E" was plotted because __________. (D051NG )
N a. a dead reckoning position is plotted within a half-hour of each course change Y b. a dead reckoning position is plotted for each speed change N c. the position is a running fix 1125 N d. the vessel's position was fixed at 1145 1735: A vessel entering the eye of a hurricane should expect __________.
N a. moderating winds and heavy confused seas to strike his vessel from all directions N b. the winds to increase to hurricane force and strike from a different direction as the eye passes N c. the barometer to reach the lowest point Y d. All of the above 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 1827: The position labeled "D" was plotted because __________. (D051NG )
N a. a dead reckoning position is plotted within 30 minutes of a running fix Y b. a dead reckoning position is plotted for each course change N c. the vessel's speed changed at 1125 N d. All of the above 1899: What is the relative bearing of an object broad on the starboard beam?
N a. 045° N b. 060° N c. 075° Y d. 090° 1987: An instrument useful in predicting fog is the __________.
Y a. sling psychrometer N b. microbarograph N c. anemometer N d. aneroid barometer 2021: While on watch, you notice that the air temperature is dropping and is approaching the dew point. Which type of weather should be forecasted?
N a. Hail N b. Heavy rain N c. Sleet Y d. Fog 2081: 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. 30° N b. 45° N c. 60° Y d. 90° 2104: A white buoy marked with an orange rectangle indicates __________.
N a. mid-channel N b. a fish net area Y c. general information N d. an anchorage 2150: On a Mercator chart, 1 nautical mile is equal to __________.
N a. 1 minute of longitude N b. 1 degree of longitude Y c. 1 minute of latitude N d. 1 degree of latitude 2176: The illustration 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? (D037NG )
N a. Three red lights N b. Two red lights Y c. One red light N d. One amber light 2176: The illustration 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? (D037NG )
N a. Three red lights N b. Two red lights Y c. One red light N d. One amber light 2180: Relative humidity is defined as __________.
N a. the maximum vapor content the air is capable of holding N b. the minimum vapor content the air is capable of holding Y c. the ratio of the actual vapor content at the current temperature to the air's vapor holding capability N d. the relation of the moisture content of the air to barometric pressure 2232: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. Which action should be taken to remove this error during compass adjustment?
N a. If the red ends are to starboard you should raise the athwartships tray. Y b. If the red ends are to starboard, and the athwartships tray is at the bottom, you should remove some magnets. N c. If the red ends are to port, and the athwartships tray is at the top, you should reverse the magnets. N d. If the red ends are to port, and the athwartships tray is at the top, you should lower the tray. 2243: Which aid is NOT marked on a chart with a magenta circle?
N a. Radar station N b. Radar transponder beacon Y c. Aero light N d. Radio beacon 2334: Other than the Sun and Moon, the brightest object in the sky is __________.
N a. Sirius N b. Canopus Y c. Venus N d. Jupiter 2464: Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which topmark shown? (D046NG )
N a. A Y b. B N c. C N d. D 2569: The mean sun used to measure time moves __________.
N a. along the ecliptic at 15° per hour N b. along the celestial equator at 15° per day N c. along the ecliptic at 15° per day Y d. along the celestial equator at 15° per hour 2625: Stormy weather is usually associated with regions of __________.
N a. high barometric pressure N b. changing barometric pressure Y c. low barometric pressure N d. steady barometric pressure 2672: When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________.
Y a. continue on the present course N b. come left N c. come right N d. wait until the lights are no longer in a vertical line 2686: The standard time meridian for description +12 is __________.
N a. 172.5°E Y b. 180.0° N c. 172.5°W N d. 165.0°W 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 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 3037: The letter H in illustration D006NG represents the __________.
Y a. visible horizon N b. celestial horizon N c. geoidal horizon N d. refractive horizon 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 3085: An ECDIS is required to display which information?
N a. Water temperature N b. Climatology data N c. Speed of advance Y d. Depth contours