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.
4: Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are __________.
N a. accurate only in the Polar regions Y b. accurate electronic servomechanisms N c. hand operated N d. accurate only if the vessel is underway 5: A vessel is steaming in east longitude on January 25 and crosses the International Date Line on an eastbound course at 0900 zone time. What is the date and time at Greenwich when the vessel crosses the line?
N a. 0900, 24 January Y b. 2100, 24 January N c. 2100, 25 January N d. 0900, 26 January 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 56: A strong, often violent, northerly wind occurring on the Pacific coast of Mexico, particularly during the colder months, is called __________.
Y a. Tehuantepecer N b. Papagayo N c. Norther N d. Pampero 61: Red lights may appear on __________.
Y a. horizontally banded buoys N b. vertically striped buoys N c. yellow buoys N d. spherical buoys 186: In the doldrums you will NOT have __________.
N a. high relative humidity N b. frequent showers and thunderstorms Y c. steep pressure gradients N d. frequent calms 200: When navigating using GPS, what is an indicator of the geometry of the satellites that your receiver is locked onto?
Y a. Horizontal Dilution of Precision N b. Selective Availability N c. Doppler Shifting N d. Precision Coding 299: Steady precipitation is typical of __________.
N a. coming cold weather conditions Y b. a warm front weather condition N c. high pressure conditions N d. scattered cumulus clouds 388: You are underway on course 120°T and your maximum speed is 12 knots. The eye of a hurricane bears 150°T, 120 miles from your position. The hurricane is moving towards 295°T at 20 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?
N a. 89 miles N b. 96 miles N c. 105 miles Y d. 117 miles 420: 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 )
Y a. Alter course to the left until the range closes then steer to the left of 306°T. N b. Maintain course as it is normal for the range to open as you get close. N c. Alter course to the left to close the range, then alter course to 309°T. N d. Alter course to the right to 309°T or more to bring the range in line. 491: A special purpose buoy shall be __________.
N a. lighted with a white light N b. striped black and red N c. lighted with a red light Y d. yellow 499: Which of the symbols shown represents an occluded front? (D018NG )
N a. A N b. B N c. C Y d. D 654: Your ARPA has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the ground. What should you expect under these circumstances?
N a. The generated CPA will be less than the actual CPA. N b. The generated TCPA will be later than the actual TCPA. N c. The range of initial target acquisition will be less than normal. Y d. The targets true course vector will be in error. 769: What does not contribute to the commercial GPS receiver position error?
N a. Satellite clock Y b. Ship's speed N c. Atmospheric/Ionospheric propagation N d. Satellites' orbits 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 813: At the magnetic equator there is no induced magnetism in the vertical soft iron because __________.
N a. the lines of force cross the equator on a 0°-180° alignment N b. the quadrantal error is 0° Y c. there is no vertical component of the Earth's magnetic field N d. the intercardinal headings have less than 1° error 826: In the U.S., in which direction do air masses usually move?
Y a. Easterly N b. Southerly N c. Northerly N d. Southwesterly 868: Your ship received a HYDROLANT advising of a special warning to mariners from the Department of State for ships in the Persian Gulf. You are 400 miles south of, and bound for, the Persian Gulf. What action should you take?
N a. Continue on course as the warning is advisory in nature only. Y b. Send an AMVER report and acknowledge receipt of the warning. N c. Remain a minimum of 500 miles outside the Persian Gulf and maintain radio silence. N d. Send a MERWARN message advising your position, course, speed and intentions. 906: In the Northern Hemisphere, an area of counterclockwise wind circulation surrounded by higher pressure is a __________.
Y a. low N b. high N c. warm front N d. cold front 965: In order for a star to be used for a sight at lower transit, the star must __________.
Y a. be circumpolar N b. have a declination equal to or greater than your latitude N c. have a GHA of 180° N d. have the SHA equal to or less than the LHA 1010: What is a characteristic of a rhumb line?
N a. It is the shortest distance between two points on the Earth. N b. It plots as a straight line on a Lambert conformal chart. Y c. It cuts each meridian at the same angle. N d. The course angle constantly changes to form the loxodromic curve. 1069: What do the numbers on isobars indicate?
Y a. barometric pressure N b. temperature N c. rain in inches N d. wind speed 1077: A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing, the water of __________.
N a. high density will be on the left in the Northern Hemisphere N b. high density will be on the right in the Southern Hemisphere Y c. low density will be on the left in the Northern Hemisphere N d. low density will be on the left in the Southern Hemisphere 1098: A chart position enclosed by a square is a(n) __________.
N a. fix Y b. estimated position N c. dead reckoning position N d. running fix 1148: The numeral in the center of a wind rose circle on a pilot chart indicates the __________.
N a. total number of observations N b. average wind force on the Beaufort scale N c. average wind force in knots Y d. percentage of calms 1155: Which aid is NOT marked on a chart with a magenta circle?
N a. Radar station Y b. Aero light N c. Radio beacon N d. Radar transponder beacon 1166: A series of brief showers accompanied by strong, shifting winds may occur along or some distance ahead of a(n) __________.
N a. upper front aloft N b. cyclone N c. occluded front Y d. cold front 1198: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a dust storm? (D042NG )
N a. I N b. H Y c. O N d. P 1224: NGA (NIMA) charts are adopting the metric system. In order to change a charted depth in meters to feet you may use the conversion table found __________.
N a. in the Light List N b. in Bowditch Vol. II N c. on the chart Y d. All of the above 1259: General information on enroute weather and climate is found in __________.
Y a. the Sailing Directions and the Coast Pilot N b. a weather fax N c. the Local Notice to Mariners N d. the Light List 1316: When a warm air mass overtakes a cold air mass, the contact surface is called a __________.
N a. line squall N b. water spout N c. cold front Y d. warm front 1355: The parallax of the Moon is greatest when the Moon is __________.
N a. in the zenith at perigee N b. on the horizon at apogee N c. at its maximum altitude at apogee Y d. on the horizon at perigee 1376: What is typical of warm front weather conditions?
N a. An increase in pressure N b. A wind shift from southwest to northwest N c. Scattered cumulus clouds Y d. Steady precipitation 1557: A Doppler log in the volume reverberation mode indicates __________.
N a. speed being made good Y b. speed through the water N c. the set of the current N d. the depth of the water 1594: The Illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "P" represents __________. (D042NG )
N a. snow N b. hail Y c. freezing rain N d. sleet 1607: When your barometer reading changes from 30.25 to 30.05 in a 12-hour period it indicates __________.
N a. rapidly changing weather N b. improving weather N c. high winds within the next six hours Y d. little or no immediate change 1683: As it approaches, a typical warm front will bring __________.
Y a. rising temperatures and falling barometric pressure N b. falling temperature and pressure N c. falling temperatures and rising pressure N d. rising barometric pressure and temperatures 1701: Which general weather conditions should you expect to find in a low pressure system?
N a. Fair weather Y b. Precipitation and cloudiness N c. Scattered clouds at high elevations N d. Gradual clearing and cooler temperatures 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 1720: In the Southern Hemisphere winds in a low pressure system rotate in a __________.
Y a. clockwise direction N b. northeasterly direction N c. northerly direction N d. counterclockwise direction 1738: In the Northern Hemisphere, the right half of the storm is known as the dangerous semicircle because __________.
N a. The wind speed is greater here since the wind is traveling in the same general direction as the storm's track N b. the direction of the wind and seas might carry a vessel into the path of the storm N c. the seas are higher because of greater wind speed Y d. All of the above 1744: Which condition suggests that your present position lies in the navigable semicircle of a tropical storm?
Y a. A backing wind N b. A veering wind N c. Sustained gale force winds N d. A strong wind that maintains a constant speed and direction 1762: In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.
N a. adding 30° of arc to the sight Y b. using a dip correction based on the height of eye above the ice N c. doubling the semidiameter correction N d. using a dip correction from table 22 in Bowditch Vol. II 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 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 1944: In the horizon system of coordinates what is the equivalent to the celestial equator of the celestial equator system?
Y a. Horizon N b. Prime vertical circle N c. Prime meridian N d. Principal vertical circle 2186: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic west but the compass reads 266°. What action should be taken?
N a. Adjust the compass with the athwartships magnets until the compass reads 268°. N b. Adjust the compass with the fore-and-aft magnets until the compass reads 270°. N c. Adjust the compass with the quadrantal spheres until the compass reads 274°. Y d. Adjust the compass with the fore-and-aft magnets until the compass reads 268°. 2188: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?
Y a. If the red ends are to starboard the athwartships magnets should be lowered. N b. If the blue ends are forward the fore-and-aft magnets should be raised. N c. If the red ends are to starboard and the tray is at the top add some athwartships magnets. N d. If the blue ends are aft the fore-and-aft magnets should be raised. 2189: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?
N a. If the blue ends are to port and the athwartships tray is at the bottom, you should add some more magnets. N b. If the blue ends are to port and the athwartships tray is at the top, you should add some more magnets. N c. If the red ends are to port, you should lower the athwartships tray. Y d. If the red ends are to port and the tray is at the bottom, you should raise the tray. 2269: One of the factors which affects the circulation of ocean currents is __________.
N a. humidity Y b. varying densities of water N c. vessel traffic N d. the jet stream 2326: A double star is a star that __________.
N a. has a declination equal to twice that of the Sun Y b. comprises two stars that appear close together N c. is twice as bright as a single star N d. suddenly becomes much brighter and then fades 2332: Magnetic dip is a measurement of the angle between the __________.
N a. geographic pole and the magnetic pole N b. lubber's line and true north Y c. horizontal and the magnetic line of force N d. compass heading and the magnetic heading 2420: You are on course 355°T and take a relative bearing of a lighthouse of 275°. What is the true bearing of the lighthouse?
N a. 080° N b. 085° N c. 280° Y d. 270° 2518: In low latitudes, the full Moon will always rise at about __________.
N a. sunrise N b. 1200 LMT Y c. sunset N d. 2400 LMT 2539: Under the IALA cardinal system, a mark with quick white light showing 3 flashes every 10 seconds indicates that the safest water in the area is on the __________.
N a. north side of the mark N b. west side of the mark Y c. east side of the mark N d. south side of the mark 2779: The buoy indicated by the letter B in illustration D044NG is a __________.
N a. nun N b. can Y c. spar N d. pillar 2896: You are navigating in pilotage waters. The maximum time between fixes should be about __________.
N a. 5 minutes Y b. 30 minutes N c. 1 hour N d. 4 hours 2938: You take a bearing of 176° of a lighthouse. What bearing of another object would give the best fix?
N a. 000° N b. 021° N c. 189° Y d. 272° 3082: Which type of GPS receiver has at least four channels to process information from several satellites simultaneously?
N a. Sequential Y b. Continuous N c. Multiplex N d. None of the above 3088: With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.
N a. an alarm if engine speed is suddenly increased Y b. an alarm if a new position has not been calculated within the last two seconds N c. an indication of a change in the number of satellites N d. None of the above.