BK NUM ANS QUESTION ANSWER A ANSWER B ANSWER C ANSWER D ILLUST The prevailing westerlies of the Southern Hemisphere during the summer 3 458 A blow 18 - 30 knots __________. all year long months only during the winter only during spring only A buoy bears 178°T at 3000 yards (2700 meters). What is the course to make good to leave the buoy 3 459 D 100 yards (90 meters) to port? 174°T 176°T 178°T 180°T When using horizontal sextant angles of three objects The vessel is inside of The vessel is outside of A circle will pass to fix your position, an indeterminate position will result The objects lie in a a triangle formed by a triangle formed by through your position 3 460 D in which situation? straight line. the objects. the objects. and the three objects. Under the U.S. Aids to Navigation System, a yellow be lighted with a white 3 461 A buoy may __________. mark a fish net area light show a fixed red light All of the above For what purpose would using a Lambert conformal Plotting radio bearings Determining latitude Measuring rhumb line Measuring rhumb line 3 462 A chart be more convenient than using a Mercator? over a long distance and longitude of a fix distances directions Prior to reading an aneroid barometer, you should tap expose any loose demagnetize the metal bring the pointer to its contract and expand 3 464 C the face lightly with your finger to __________. connections elements true position the glass face When applying a dip correction to the sighted sextant angle (hs), you always subtract the dip because you hs to the sensible hs to the celestial Ho to the celestial 3 465 B are correcting __________. hs to the visible horizon horizon horizon horizon mountainous but fairly In the relatively calm area near the hurricane center, moderate but easily mountainous and regular as far as 3 466 C the seas are __________. navigated calm confused direction is concerned At what time after 1400 EST (ZD +5), on 4 January 1983, will the height of the tide at Port Wentworth, GA, 3 467 C be 3.0 feet? 1612 1630 1653 1718 Where are the prevailing westerlies of the Southern Between the Equator Between 10° and 20° Between 30° and 60° Between 60° and 90° 3 469 C Hemisphere located? and 10° latitude latitude latitude latitude You are underway on course 120°T and can make 12 knots. The eye of a hurricane bears 150°T at 120 miles. The hurricane is on course 295° at 20 knots. What course should you steer at 12 knots to have the 3 470 C maximum CPA? 312° 330° 348° 001° horizontally-banded 3 471 A Yellow lights may appear on __________. special purpose buoys vertically-striped buoys buoys spherical buoys Which conic projection chart features straight lines 3 472 B which closely approximate a great circle? Polyconic Lambert conformal Orthographic Stereographic The direction and rate Which indication on the barometer is most meaningful The words "Fair -- of change of The actual barometric 3 474 B in forecasting weather? Change -- Rain" barometric pressure pressure The relative humidity A correction for augmentation is included in the 3 475 B Nautical Almanac corrections for __________. the Sun the Moon Venus None of the above Tropical cyclones normally form within which of the 3 476 A following belts of latitude? 5° to 15° 15° to 30° 30° to 45° 45° to 60° Determine the height of the tide at 1430 EST (ZD +5) 3 477 C at New Bedford, MA, on 10 April 1983. 1.1 feet 1.2 feet 1.4 feet 1.7 feet The velocity of the apparent wind can be more than the true wind, and come from the same direction, if certain ship's speed must be true wind velocity must conditions are present. One condition is that the less than the true wind true wind must be from be faster than the true wind must be from 3 478 D __________. velocity dead astern ship's speed dead ahead A special mark (yellow buoy), if lighted, may exhibit 3 481 A which light rhythm? Flashing Morse "A" Equal interval Occulting Meridians appear as Distance is measured curved lines Parallels, except the A rhumb line appears at the mid-latitude of converging toward the equator, appear as 3 482 D Which statement about a gnomonic chart is correct? as a straight line. the track line. nearer pole. curved lines. Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as the effects of beam limitations on range the pulse length of the the multiple-target 3 483 A individual targets due to __________. width resolution radar resolution factor The needle of an aneroid barometer points to 30.05 on the dial. This indicates that the barometric pressure is 30.05 inches of 30.05 millimeters of 3 484 A __________. mercury mercury 30.05 millibars falling A phase correction is applied to observations of 3 485 C __________. the Sun stars planets All of the above Tropical cyclones do not form within 5° of the Equator there are no fronts in of negligible Coriolis 3 486 D because __________. that area it is too hot it is too humid force What will be the time after 0600 (ZD +3), on 6 March 1983, that the height of the tide at Puerto Rosales, 3 487 D Argentina, will be 9.0 feet (2.7 meters)? 0740 0754 0840 0922 are triangular in shape may either be to indicate that it may cylindrical or conical not be possible to pass Unlighted, red and green, horizontally-banded buoys are cylindrical in shape are conical in shape since the shape has no on either side of the 3 1 B with the topmost band red __________. and called can buoys and called nun buoys significance buoy On an isomagnetic chart, the line of zero variation is 3 2 D the __________. zero variation line isogonic line variation line agonic line there will be no there is an error in the the signal is in proper increase or decrease in transmission of that that it has the proper 3 3 C Blinking of a Loran-C signal indicates __________. sequence kHz signal GRI Gyrocompass repeaters reproduce the indications of accurate only in the accurate electronic accurate only if the 3 4 B the master gyrocompass. They are __________. Polar regions servomechanisms hand operated vessel is underway 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 3 5 B the line? 0900, 24 January 2100, 24 January 2100, 25 January 0900, 26 January directly with the temperature of the air directly with the inversely with the inversely with the 3 6 B Wind velocity varies __________. mass pressure gradient barometric pressure absolute humidity The period at high or low tide during which there is no change in the height of the water is called the 3 7 C __________. range of the tide plane of the tide stand of the tide reversing of the tide When you are steering on a pair of range lights and wait until the lights are find the upper light is above the lower light you should continue on the present no longer in a vertical 3 8 C __________. come left come right course line that traffic is When displayed under a single-span fixed bridge, red the bridge is about to approaching from the 3 9 A lights indicate __________. the channel boundaries that vessels must stop open other side The wind at Frying Pan shoals has been northwesterly at an average velocity of 22 knots. The predicted set and drift of the rotary current are 125° at 0.6 knot. 3 10 A What current should you expect? 119° at 0.9 knot 172° at 1.1 knots 225° at 0.6 knot 340° at 0.4 knot A buoy having red and green horizontal bands would interrupted quick composite group 3 11 B have a light characteristic of __________. flashing flashing Morse (A) quick flashing Lines on a chart which connect points of equal 3 12 D magnetic variation are called __________. magnetic latitudes magnetic declinations dip isogonic lines Most modern Loran-C receivers, when not tracking bell alarm to warn the lighted alarm signal to alternate signal keying view finder for each 3 13 B properly, have a(n) __________. user warn the user system station You have replaced the chart paper in the course Test the electrical gain Line the course pen up Adjust the chart paper recorder. What is NOT required to ensure that a to the thermograph Set the zone pen on on the exact heading of to indicate the correct 3 14 A correct trace is recorded? pens the correct quadrant the ship time 3 15 C What is the length of a nautical mile? 1,800 meters 2,000 yards 6,076 feet 5,280 feet from high pressure from low pressure directly from high directly from low toward low pressure toward high pressure pressure toward low pressure toward high deflected by the earth's deflected by the earth's 3 16 C The direction of the surface wind is __________. pressure pressure rotation rotation the actual depth of the the vertical rise or fall tidal current is at a water equals the 3 17 A "Stand" of the tide is that time when __________. of the tide has stopped slack water occurs maximum charted depth A vessel's position should be plotted using bearings of fixed known objects on 3 18 B __________. buoys close at hand shore buoys at a distance All of the above You are approaching a swing bridge at night. You will know that the bridge is open for river traffic when the fixed, green light the amber light the red light is the red light changes to 3 19 D __________. starts to flash changes to green extinguished green You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 120°T, 110 miles from your position. The hurricane is moving towards 285°T at 25 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the 3 20 A maximum CPA? 77 miles 82 miles 87 miles 93 miles 3 21 B Which buoy is NOT numbered? Green can buoy Preferred-channel buoy Red lighted buoy Green gong buoy Charts showing the coast of Mexico are produced by National Geospatial- 3 22 A the United States __________. Intelligence Agency Coast Guard Naval Observatory National Ocean Service If Loran-C signals become unsynchronized, the stations discontinue 3 23 A receiver operator is warned because __________. signals begin to blink signals begin to shift transmission stations transmit grass You are in LONG 144°E. The date is 6 February, and the zone time is 0800. The Greenwich date and time 3 25 A are __________. 2200, 5 February 2300, 5 February 1700, 6 February 1800, 6 February Wind direction may be determined by observing all of 3 26 D the following EXCEPT __________. low clouds waves whitecaps swells have lows lower than have lows higher than normal and highs normal and highs lower occur in the spring of 3 27 A Spring tides are tides that __________. higher than normal than normal are unpredictable the year The buoy should be The buoy should be If the light is flashing, considered to be in the considered to always the buoy should be charted position if it When using a buoy as an aid to navigation which of the be in the charted considered to be in the The buoy may not be in has been freshly 3 28 C following should be considered? location. charted location. the charted position. painted. You are approaching a multiple-span bridge at night. 3 white lights in a The main navigational channel span will be indicated a quick flashing red or a steady blue light in vertical line in the a flashing green light in 3 29 C by __________. green aid to navigation the center of the span center of the span the center of the span the declination is of a When taking an amplitude, the Sun's center should be the Sun is near or at a different name from the the Sun's declination is 3 30 A observed on the visible horizon when __________. in high latitudes solstice latitude at or near 0° When approaching a preferred-channel buoy, the best color of the uppermost shape of an unlighted 3 31 A channel is NOT indicated by the __________. light characteristic band buoy color of the light The datum used for soundings on charts of the Atlantic 3 32 B Coast of the United States is mean __________. low water lower low water higher high water high water The Local Notice to Mariners is usually published 3 34 B __________. daily weekly monthly semiannually You are on a vessel at 0400 ZT on 3 July, and the ZD 3 35 D for your position is -8. What is the GMT? 1200, 3 July 2000, 3 July 1200, 2 July 2000, 2 July Horizontal movement Vertical movement of Mixing tendency of the Salinity content of the 3 37 B What does the term "tide" refer to? of the water the water water water can always rely on a should assume a wreck should never rely on a can always rely on a buoy to show proper buoy is directly over the floating aid to maintain 3 38 D When navigating a vessel, you __________. buoy to be on station light characteristics wreck its exact position Civil twilight begins at 1910 zone time on 20 July 1981. Sights of Saturn, Your DR position at that time is LAT 22°16'N, LONG Venus will have a Mars, Venus, Jupiter, Jupiter, and Venus will 150°06'W. Which statement concerning the planets westerly meridian Mars will set about one and Saturn will be yield a good three-line- 3 39 A available for evening sights is TRUE? angle. hour after the Sun sets. above the horizon. of-position fix. The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1600 and turn for 8 knots, at what 3 40 C point will you lose the ebb current? Billingsport Marcus Hook Mile 63 Mile 52 heights above water of Mean high water is the reference plane used for all vertical land features such as soundings on the East water depths on the 3 41 B __________. measurements lights and West Coasts East Coast only The datum used for soundings on charts of the East 3 42 C Coast of the United States is __________. mean low water springs mean low water mean lower low water half tide level A buoy with a composite group-flashing light indicates 3 43 C a(n) __________. anchorage area fish net area bifurcation dredging area faster than the speed faster than the speed the same speed as the slower than the speed of calibration for the The speed of sound through ocean water is nearly of calibration for the speed of calibration for of calibration for the fathometer, unless the 3 44 A always __________. fathometer the fathometer fathometer water is very warm The navigator aboard a ship at approximately 165°E longitude observes the Sun at ZT 14-25-04 on 21 September. What is the GMT and Greenwich date of 03-25-04, 21 02-25-04, 21 01-25-04, 21 01-25-04, 20 3 45 A the observation? September September September September 3 46 A What wind reverses directions seasonally? Monsoon winds Hooked trades Jet stream Secondary winds distance the tide duration of time difference between the moves out from the between high and low heights of high and low maximum depth of the 3 47 C The range of tide is the __________. shore tide tide water at high tide When should a navigator rely on the position of floating During calm weather Only when inside a Only when fixed aids 3 48 D aids to navigation? only During daylight only harbor are not available While steering a course of 150°T, you wish to observe a body for a latitude check. What would the azimuth 3 49 A have to be? 000°T 090°T 150°T 240°T The difference between the heights of low and high tide 3 50 B is the __________. period range distance depth In the U.S. Aids to Navigation System, red and green channels for shallow general anchorage junctions or 3 51 D horizontally-banded buoys mark __________. draft vessels areas fishing grounds bifurcations The reference datum used in determining the heights 3 52 B of land features on most charts is __________. mean sea level mean high water mean low water half-tide level 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 3 55 D and date are __________. 00h 02m on the 4th 00h 02m on the 5th 23h 50m on the 5th 00h 02m on the 6th A strong, often violent, northerly wind occurring on the Pacific coast of Mexico, particularly during the colder 3 56 A months, is called __________. Tehuantepecer Papagayo Norther Pampero difference between the difference between the depth of water at a difference between the depth of the water and depth of the water at specific time due to depth of the water and the high water tidal high tide and the depth 3 57 B The height of tide is the __________. tidal effect the area's tidal datum level of the water at low tide You should plot your dead reckoning position All of the above are 3 58 D __________. at every course change hourly at every speed change correct. For navigational purposes, each great circle on the 3 59 D Earth has a length of __________. 3,600 miles 5,400 miles 12,500 miles 21,600 miles The predicted time that the ebb begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1630 and turn for 12 knots, at what 3 60 A point will you lose the flood current? New Castle Reedy Island Mile 44 Ship John Shoal Lt. horizontally banded 3 61 A Red lights may appear on __________. buoys vertically striped buoys yellow buoys spherical buoys vertical distance from the chart sounding vertical distance from datum to the ocean the chart sounding average height of water bottom, plus the height datum to the ocean over a specified period average height of all 3 62 B Charted depth is the __________. of tide bottom of time low waters at a place a horizontal matching automatic signal A "full service" Loran-C receiver will provide matching pulse rates of an automatic on-and- of all delayed acquisition and cycle 3 63 D __________. at least 20 stations off switch hyperbolic signals matching Mean lower low water is the reference plane used for all vertical heights above water for soundings on the U.S. water depths on the 3 64 C __________. measurements lights, mountains, etc. east and west coasts U.S. east coast only The LMT of LAN is 1210. Your longitude is 70°30'E. Which time would you use to enter the Nautical Almanac to determine the declination of the Sun at 3 65 C LAN? 1842 1652 0728 0652 Circulate about a low Circulate about a high Change direction in a pressure center in a pressure center in a clockwise manner in counterclockwise Vary in strength clockwise manner in the Northern manner in the Northern constantly and the Southern 3 66 A What will a veering wind do? Hemisphere Hemisphere unpredictably Hemisphere The vertical distance The vertical distance from the tidal datum to The vertical difference The vertical difference from the surface of the the level of the water between the heights of between a datum plane water to the ocean 3 67 A What is the definition of height of tide? at any time low and high water and the ocean bottom floor A position obtained by taking lines of position from one object at different times and advancing them to a dead-reckoning 3 68 D common time is a(n) __________. position estimated position fix running fix The parallax angle will vary the most with the time of 3 69 A year for __________. Venus Jupiter Saturn Polaris 3 70 C The station located at "A" is the __________. on station off station master station secondary station D001NG 3 71 A A preferred-channel buoy may be __________. lettered spherical showing a white light All of the above the same as that used The datum from which the predicted heights of tides for the charts of the the highest possible given in table three of 3 72 B are reckoned in the tide tables is __________. mean low water locality level the tide tables When operated over a muddy bottom, a fathometer a shallow depth 3 74 D may indicate __________. reading a zero depth reading no depth reading two depth readings The Local mean time of LAN is 1152. Your longitude is 73°15'E. What time would you use to enter the Nautical Almanac to determine the declination of the Sun at 3 75 A LAN? 0659 0652 1859 1852 In the Northern Hemisphere, a wind that shifts 3 76 B counterclockwise is a __________. veering wind backing wind reverse wind chinook wind When there are small differences between the heights of two successive high tides or two low tides, in a tidal 3 77 B day, the tides are called __________. diurnal semidiurnal solar mixed A single line of position combined with a dead- 3 78 B reckoning position results in a(n) __________. assumed position estimated position fix running fix The rate of increase in hour angle is the slowest for 3 79 B __________. the Sun the Moon Mars Mercury When the moon is at first quarter or third quarter 3 80 C phase, what type of tides will occur? Apogean Perigean Neap Spring A buoy with a composite group-flashing light indicates 3 81 A a(n) __________. bifurcation fish net area anchorage area dredging area On the west coast of North America, charted depths 3 82 D are taken from __________. high water mean tide level mean low water mean lower low water each station to only All Loran-C transmitting stations are equipped with every station in one each station to transmit on-line transmission of depend on the master cesium frequency standards which permit chain to transmit at the without reference to single-line transmitters for synchronization and 3 83 B __________. same time another station at the same time signal ratio receive a first return receive a strong return near the surface during at about 200 fathoms the day, and a strong have to recalibrate (366 meters) during the return at about 200 receive false echoes at every couple of days When using an echo sounder in deep water, it is NOT day, and one nearer fathoms (366 meters) a constant depth day due to inaccurate 3 84 A unusual to __________. the surface at night at night and night readings Your longitude is 179°59'W. The LMT at this longitude is 23h 56m of the 4th day of the month. Six minutes later your position is 179°59'E longitude. Your LMT 3 85 D and date is now __________. 00h 02m on the 4th 00h 02m on the 5th 23h 50m on the 5th 00h 02m on the 6th A weather forecast states that the wind will commence shift in a backing. In the Northern Hemisphere, this would shift in a clockwise counterclockwise continue blowing from 3 86 B indicate that it will __________. manner manner the same direction decrease in velocity only one high and one the high tide is higher the high tide and low low water occur during and the low tide is tide are exactly six two high tides occur 3 87 A A tide is called diurnal when __________. a lunar day lower than usual hours apart during a lunar day Which position includes the effects of wind and Dead reckoning 3 88 C current? position Leeway position Estimated position Set position The GHA of the first point of Aries is 315° and the GHA of a planet is 150°. What is the right ascension of the 3 89 B planet? 7 hours 11 hours 19 hours 23 hours When the moon is new or full, which type of tides 3 90 B occur? Neap Spring Diurnal Apogean white light whose composite group- composite group- characteristic is Morse group-occulting white flashing (2 + 1) white flashing (2 + 1) red or 3 91 D A preferred-channel buoy will show a __________. (A) light light green light When utilizing a Pacific Coast chart, the reference lowest normal low 3 92 C plane of soundings is __________. mean low water springs mean low water mean lower low water water The time interval between the transmission of signals from a pair of Loran-C stations is very closely an atomic time 3 93 A controlled and operates with __________. standard Daylight Savings Time Eastern Standard Time Greenwich Mean Time Multiple returns When using a recording depth finder in the open reflected from the ocean, what phenomena is most likely to produce a bottom to the surface continuous trace that may not be from the actual ocean Echoes from a deep Echoes from schools of and to the bottom Poor placement of the 3 94 A bottom? scattering layer fish again transducer on the hull The difference in local time between an observer on 3 95 C 114°W and one on 119°W is __________. 1.25 minutes 5 minutes 20 minutes 75 minutes A weather forecast states that the wind will commence shift in a veering. In the Northern Hemisphere this indicates that shift in a clockwise counterclockwise continue blowing from 3 96 A the wind will __________. manner manner the same direction increase in velocity about 50 minutes about 50 minutes about 10 minutes shorter than the solar longer than the solar longer than the solar the same length as the 3 97 B The lunar or tidal day is __________. day day day solar day A position that is obtained by applying estimated current and wind to your vessel's course and speed is dead reckoning 3 98 B a(n) __________. position estimated position fix None of the above You are enroute to Jacksonville, FL, from San Juan, P.R. There is a fresh N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to smoother seas and steeper waves, closer 3 99 B encounter __________. warmer water together long swells cirrus clouds You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 080°T, 100 miles from your position. The hurricane is moving towards 265°T at 22 knots. What course should you steer at 12 knots to have the maximum 3 100 B CPA? 219° 208° 199° 190° A lighted preferred-channel buoy may show a composite group- 3 101 C __________. fixed red light Morse (A) white light flashing light yellow light This is a non- Which statement about an NGA (NIMA) chart with navigational or special It is not included in the It is a chart of an area It depicts a major 3 102 C stock no.23BHA23433 is TRUE? purpose chart. portfolio. in subregion 23. portion of an ocean. In Loran-C the high accuracy of atomic time and frequency controls allows each station to operate on schedule, 3 103 B __________. at higher frequencies independently at 1,975 kHz in a multiplex phase What should you apply to a fathometer reading to Subtract the draft of the Add the draft of the Subtract the sea water Add the sea water 3 104 B determine the depth of water? vessel. vessel. correction . correction. If the GMT is 1500, the time at 75°E longitude is 3 105 D __________. 1000 1500 1700 2000 A local wind which occurs during the daytime and is caused by the different rates of warming of land and 3 106 D water is a __________. foehn chinook land breeze sea breeze The average height of the surface of the sea for all stages of the tide over a 19 year period is called 3 107 D __________. mean high water mean low water half-tide level mean sea level