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 74: When operated over a muddy bottom, a fathometer may indicate __________.
N a. a shallow depth reading N b. a zero depth reading N c. no depth reading Y d. two depth readings 127: Mean low water is the average height of __________.
N a. the surface of the sea N b. high waters and low waters Y c. all low waters N d. the lower of the two daily low tides 214: A sextant having an index error that is "on the arc" has a __________.
N a. positive correction N b. dip error Y c. negative correction N d. semidiameter error 243: The loran lines drawn on navigation charts represent __________.
Y a. ground waves N b. skywaves N c. either ground waves or skywaves interchangeably N d. an average between ground wave and skywave positions 254: The range of tide is the __________.
Y a. difference between the heights of high and low tide N b. distance the tide moves out from the shore N c. duration of time between high and low tide N d. maximum depth of the water at high tide 294: What is a nonadjustable error of the sextant?
Y a. Prismatic error N b. Index error N c. Side error N d. Error of collimation 305: IN REGION A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a __________.
Y a. red can buoy N b. black can buoy N c. red conical buoy N d. black conical buoy 310: Which sextant shown has an index error of 3'30" off the arc? (D050NG )
N a. A Y b. B N c. C N d. D 347: The illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates rain? (D042NG )
Y a. N N b. M N c. I N d. G 426: The wind speed and direction observed from a moving vessel is known as __________.
N a. coordinate wind N b. true wind Y c. apparent wind N d. anemometer wind 435: If an observer is at 35°N latitude, his zenith is __________.
N a. 55°S of the celestial equator N b. at the north celestial pole Y c. 35°N of the celestial equator N d. 55°N of the celestial equator 564: A hygrometer is a device used for determining __________.
N a. the absolute temperature N b. atmospheric pressure N c. wind velocity Y d. relative humidity 631: A light characteristic of composite group flashing indicates that there is a(n) __________.
N a. sharp turn in the channel N b. narrowing in the channel at that point Y c. junction in the channel N d. obstruction that must be left to port 778: The navigable semicircle of a hurricane in the Northern Hemisphere is that area of the storm measured __________.
N a. from true north clockwise to 180°T N b. from true north counterclockwise to 180°T N c. from the bow counterclockwise to 180° relative Y d. from the direction of the storm's movement counterclockwise 180° 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 820: A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) __________.
N a. dead-reckoning position Y b. running fix N c. estimated position N d. fix 895: The ecliptic is __________.
Y a. the path the Sun appears to take among the stars N b. the path the Earth appears to take among the stars N c. a diagram of the zodiac N d. a great circle on a gnomonic chart 904: All of the following are associated with cumulonimbus clouds EXCEPT __________.
Y a. steady rainfall N b. hail storms N c. thunderstorms N d. tornadoes or waterspouts 1055: The radius of a circle of equal altitude for a body equals the body's __________.
N a. declination N b. polar distance N c. altitude Y d. zenith distance 1069: What do the numbers on isobars indicate?
Y a. barometric pressure N b. temperature N c. rain in inches N d. wind speed 1186: As a cold front passes an observer, pressure __________.
N a. drops and winds become variable Y b. rises and winds become gusty N c. drops and winds become gusty N d. rises and winds become variable 1241: Which picture shows a fixed and flashing light? (D034NG )
Y a. A N b. B N c. C N d. D 1304: The distance to the nearest vertex from any point on a great circle track cannot exceed __________.
Y a. 5400 nautical miles N b. 5840 nautical miles N c. 6080 nautical miles N d. 10,800 nautical miles 1335: Plain language is usually used on marine weather __________.
Y a. forecasts N b. observations N c. analyses N d. reports 1338: Which type of cloud is indicated by the number 6? (D039NG )
N a. Altocumulus Y b. Stratocumulus N c. Altostratus N d. Cirrus 1374: On a working copy of a weather map, a warm front is represented by what color line?
Y a. Red N b. Blue N c. Alternating red and blue N d. Purple 1492: You are planning a voyage from San Francisco to Japan. Which publication contains information on the ocean routes?
N a. Coast Pilot Y b. Sailing Directions (Planning Guide) N c. Sailing Directions (Enroute) N d. World Port Index 1540: You are sailing south on the Intracoastal Waterway (ICW) when you sight a green can buoy with a yellow square painted on it. Which of the following is TRUE?
N a. You should pass the buoy close aboard on either side. N b. The buoy marks the end of the ICW in that area. Y c. You should leave the buoy to port. N d. The yellow square is retroreflective material used to assist in sighting the buoy at night. 1628: As the temperature of the air reaches the dew point, __________.
N a. rain must develop Y b. fog may form N c. it begins to snow N d. water freezes 1658: Fog forms when the air temperature is at or below __________.
N a. 32° F N b. the wet bulb temperature Y c. the dew point N d. the dry bulb temperature 1665: Air circulation is caused or affected by __________.
N a. the rotation of the earth on its axis N b. convection currents caused by differences in radiant heating between equatorial and polar regions N c. mountain ranges Y d. All of the above 1700: Generally speaking, you should expect to find low atmospheric pressure prevailing in the earth's __________.
Y a. equatorial area N b. polar regions N c. mid-latitudes N d. All of the above 1711: An instrument that indicates wind direction is known as a(n) __________.
Y a. weather vane, wind vane or wind sock N b. hydrometer N c. hygrometer N d. sling psychrometer 1733: An instrument which maintains a continuous record of temperature changes is called a __________.
N a. thermometer N b. barometer Y c. thermograph N d. hygrograph 1775: The letter A in illustration D006NG represents the __________.
N a. celestial horizon N b. geoidal horizon Y c. sensible horizon N d. visible horizon 1890: A vessel heading SSE is on a course of __________.
N a. 112.5° N b. 135.0° Y c. 157.5° N d. 180.0° 1956: In the North Sea area, you sight a buoy showing a quick white light with 6 flashes, followed by one long flash at 15 second intervals. Which of the four topmarks shown would be fitted to this buoy? (D030NG )
Y a. A N b. B N c. C N d. D 1976: The Moon is nearest to the Earth at __________.
Y a. perigee N b. the vernal equinox N c. the new Moon N d. the full Moon 2061: Fog is likely to occur when there is little difference between the dew point and the __________.
N a. relative humidity Y b. air temperature N c. barometric pressure N d. absolute humidity 2175: 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, which light(s) will be shown at D if the lock walls and piers are not awash?
N a. One amber light Y b. One red light N c. Two red lights N d. Three red lights 2241: The letter C in illustration D006NG represents the __________.
N a. visible horizon N b. geoidal horizon N c. sensible horizon Y d. celestial horizon 2304: 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 longitude N b. Diurnal libration Y c. Vertical libration N d. Libration in latitude 2351: A position obtained by applying ONLY your vessel's course and speed to a known position is a __________.
N a. running fix N b. probable position N c. fix Y d. dead-reckoning position 2399: Which statement about the time diagram shown is TRUE? (D008NG )
N a. The Greenwich date is one day later than your date. N b. The diagram is valid only if you are in the southern hemisphere. N c. The LHA of the Sun is approximately 40°. Y d. The diagram represents a morning Sun sight. 2460: You are on course 344°T and take a relative bearing of a lighthouse of 270°. What is the true bearing to the lighthouse?
N a. 016° N b. 074° N c. 090° Y d. 254° 2474: A vessel is heading magnetic north and its magnetic compass indicates a heading of 356°. What action should be taken to remove this error during compass adjustment?
N a. If the blue ends of the magnets are to port, and the athwartships tray is at the top, you should remove some of the magnets. Y b. If the blue ends of the magnets are to starboard, and the athwartships tray is at the bottom, you should remove some magnets. N c. If the red ends of the magnets are to starboard, and the athwartships tray is at the bottom, you should reverse the magnets. N d. If the blue ends of the magnets are to starboard, you should raise the athwartships tray. 2482: When a vessel changes course from one cardinal heading to another cardinal heading while adjusting the compass, which action should be taken?
N a. The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings. Y b. After the new heading is reached, the vessel should steam on that course for at least two minutes before the adjustment. N c. During the course change, you should gently tap the compass to remove any error caused by friction on the pivot bearing. N d. After steadying on the new heading, the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error. 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 2851: You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________.
N a. dead-reckoning position Y b. estimated position N c. running fix N d. fix 2899: You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?
N a. 356° N b. 073° N c. 192° Y d. 309° 2936: Information on search and rescue procedures and special, local communications used in Mexican waters will be found in the __________.
N a. World Port Index N b. International Code of Signals (Pub 102) Y c. Sailing Directions (Planning Guides) N d. International Aeronautical and Maritime Search and Rescue Manual 2958: Drawbridges equipped with radiotelephones display a __________.
N a. day signal of a yellow diamond marked with the call sign N b. white sign with the number 16 and the call sign on it N c. black and white diamond marked with RT 16 Y d. blue and white sign showing the radio's channels 2988: The buoy indicated by the letter A is a __________. (D044NG )
N a. nun Y b. can N c. spar N d. pillar 3018: You take a bearing of 356° of a lighthouse. Which bearing of another object would give the best fix?
N a. 013° N b. 178° Y c. 256° N d. 342° 3033: A navigator fixing a vessel's position by radar __________.
Y a. can use radar information from one object to fix the position N b. should never use radar bearings N c. should only use radar bearings when the range exceeds the distance to the horizon N d. must use information from targets forward of the beam 3041: The letter H in illustration D006NG represents the __________.
N a. refractive horizon N b. geoidal horizon N c. celestial horizon Y d. visible horizon 3087: With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.
Y a. a warning of loss of position N b. a cross-track error alarm N c. an indication of a change in satellite configuration N d. an alarm if engine speed is suddenly reduced 3110: While underway, automatic identification systems (AIS) broadcast all of the following information every 1 to 10 seconds EXCEPT the __________.
N a. speed over ground N b. latitude and longitude N c. course over ground Y d. ship's scantlings 3126: Which of the following statements is TRUE regarding automatic identification systems (AIS)?
N a. AIS will not provide information on another vessel if that vessel is indistinguishable in radar sea clutter. N b. AIS can be relied upon as the sole means to determine risk of collision and safe speed. N c. AIS is designed to replace ARPA, maneuvering boards, and visual bearings as a means to ascertain the risk of collision. Y d. AIS provides the other vessel's identity, dimensions and navigational status regardless of visibility.