U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 ......Aug 29, 2019 · Q139-Navigation...

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U.S.C.G. Merchant Marine Exam

Mate Less than 500-1600 Gross Registered Tons

Q139-Navigation General-Oceans

(Sample Examination)

of 18 Q139-Navigation General-Oceans

8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2

Choose the best answer to the following Multiple Choice questions.

1. Your ship is entering port from sea, and you sight a pair of range lights. When in line, they bear 315° per standard magnetic compass. The chart shows that the range bearing is 312°T, and that variation is 6°W. What is the deviation of your compass at the time of the sighting?

• (A) 3°E o (B) 3°W o (C) 9°E o (D) 9°W

If choice A is selected set score to 1.

2. Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have __________.

o (A) an odd number • (B) horizontal bands o (C) a pillar shape o (D) an even number

If choice B is selected set score to 1.

3. You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix?

o (A) 022° o (B) 131° o (C) 211° • (D) 249°

If choice D is selected set score to 1.

4. Which term defines the small circle of the celestial sphere parallel to the celestial equator, and transcribed by the daily motion of the body?

• (A) Parallel of declination o (B) Vertical circle of the body o (C) Hour circle of the body o (D) Parallel of altitude



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 5. Which statement about gyrocompass error is TRUE?

o (A) The sign (E or W) of the error will change with different headings of the ship. o (B) Any error will remain constant unless the compass is stopped and restarted. o (C) Any error shown by a gyro repeater will be the same as the error of the master compass. • (D) The amount of the error and the sign will generally be the same on all headings.


6. If you are the Master of a towing vessel whose only working radar no longer functions, what must you do?

o (A) Moor the vessel until it is repaired. o (B) Notify the Officer in Charge of Marine Inspection (OCMI) if you cannot repair it within 48

hours. • (C) Notify the Captain of the Port (COTP) if you cannot repair it within 96 hours. o (D) Anchor the vessel until it is repaired.

If choice C is selected set score to 1.

7. Which list of clouds is in sequence, from highest to lowest in the sky?

o (A) Altostratus, cirrostratus, stratus o (B) Altostratus, stratus, cirrostratus • (C) Cirrostratus, altostratus, stratus o (D) Stratus, cirrostratus, altostratus


8. On which of the following does an automatic identification system (AIS) transponder transmit and receive information?

o (A) UHF L-band • (B) VHF maritime band o (C) 10 cm, S-band radar o (D) 3 cm, X-band radar


9. You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which of the following is TRUE?

• (A) You should leave the buoy on your port hand. o (B) This buoy marks the end of the ICW in that geographic area. o (C) The yellow square is in error and it should be a yellow triangle. o (D) The yellow is retro-reflective material used to assist in sighting the buoy at night.



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 10. While taking weather observations, you determine that the wind is coming from the west. In the

weather log, how would you record the wind direction?

o (A) 000° o (B) 090° o (C) 180° • (D) 270°


11. What is a characteristic of cardinal marks?

o (A) Square or triangular topmarks o (B) Number-letter combinations for identification • (C) Light rhythms indicating directional orientation o (D) Vertical stripes


12. If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?

o (A) East to northeast • (B) North to northwest o (C) South to southeast o (D) East to southeast


13. ECDIS must give an alarm for which of the following cases?

o (A) If the ship, within a specified time set by the watch officer, is going to cross the boundary of a prohibited area

o (B) When the specified limit for deviation from the planned route is exceeded o (C) If the ship, within a specified time set by the watch officer, is going to cross a safety contour • (D) All of the above


14. What does a barometer measure?

o (A) Dew point o (B) Relative humidity • (C) Atmospheric pressure o (D) Temperature



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 15. You take a bearing of 356° of a lighthouse. Which bearing of another object would give the best fix?

o (A) 178° • (B) 256° o (C) 342° o (D) 013°


16. While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's foghorn 3 seconds after the signal was sounded. What is the distance to the shore?

• (A) 550 yards o (B) 872 yards o (C) 1100 yards o (D) 792 yards


17. When your vessel is on the storm track but behind the storm's center the __________.

o (A) barometer rises o (B) wind speed decreases o (C) wind direction remains steady • (D) All of the above


18. What is the name of the region of high pressure extending around the Earth at about 35°N latitude?

• (A) The horse latitudes o (B) The doldrums o (C) The prevailing westerlies o (D) The troposphere


19. A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude?

o (A) 27°W o (B) 27°E o (C) 127°E • (D) 53°E



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 20. Which is one of the advantages of a vessel utilizing a NAVTEX unit to receive MSI?

o (A) Information on a given topic is only broadcast at specified times o (B) Only an ordinary FM radio is necessary to receive these warnings • (C) Ease of operation, knowledge of Morse code is not required o (D) They cover a broad spectrum of the radio band allowing reception on almost any type of

receiver


21. Which is TRUE of Monsoons?

o (A) They are light, variable winds with little or no humidity o (B) They are strong, cyclonic winds that change direction with the passage of an extreme low

pressure system • (C) They are steady winds that reverse direction semiannually o (D) They are strong, gusty winds that blow from the same general direction all year


22. Your ship is proceeding on course 320°T at a speed of 25 knots. The apparent wind is from 30° off the starboard bow, speed 32 knots. What is the relative direction, true direction and speed of the true wind?

• (A) Relative 80°, true 040°T, 16.2 knots o (B) Relative 60°, true 040°T, 18.6 knots o (C) Relative 80°, true 060°T, 15.2 knots o (D) Relative 40°, true 080°T, 16.4 knots


23. You are underway on course 127°T. You sight a buoy with the topmarks shown in illustration D025NG below, bearing two points on the starboard bow. Which action must be taken?

o (A) Alter course to starboard until the buoy is at least two points on the port bow, then hold course.

o (B) Change course to have the buoy close aboard either side. • (C) Ensure the bearings change to the right. o (D) Alter course to port until the buoy is broad on the starboard quarter, then hold course.



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 24. Your vessel is on course 270°T, speed 10 knots. The apparent wind is from 10° off the port bow,

speed 30 knots. From which direction is the true wind?

o (A) 345°T o (B) 165°T • (C) 255°T o (D) 075°T


25. What is the characteristic of a quick flashing light?

• (A) Shows not less than 60 flashes per minute o (B) Shows quick flashes for about 5 seconds followed by a 1 second dark period o (C) Durations of light and darkness are equal o (D) Shows groups of 2 or more flashes at regular intervals


26. Under the IALA-A Buoyage System, a green spar buoy with a triangular topmark would indicate that the buoy __________.

• (A) should be left to port when heading out to sea o (B) is on the north side of a point of interest o (C) is marking the preferred channel o (D) may be left close aboard on either side


27. What is the name given to lines on a chart which connect points of equal magnetic variation?

• (A) Isogonic lines o (B) Magnetic declinations o (C) Magnetic latitudes o (D) Dip lines


28. You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?

o (A) 356° • (B) 102° o (C) 144° o (D) 201°



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 29. What great circle is always needed to form the astronomical triangle?

o (A) Prime Meridian o (B) Celestial Equator • (C) Celestial Meridian o (D) Prime Vertical Circle


30. In mid-ocean, the characteristics of a wave are determined by three factors. What is NOT one of these factors?

o (A) Wind velocity o (B) Length of time a wind has been blowing o (C) Fetch • (D) Effect of the moon's gravity


31. When trying to sight a lighthouse you notice a glare from a town in the background. How does this affect the range at which the light may be sighted?

o (A) Increased if the light is red or green due to contrast with the glare • (B) Considerably reduced and difficult to distinguish o (C) Unchanged o (D) Increased slightly due to extra lighting


32. Yesterday your chronometer read 11h 59m 59s at the 1200 GMT time tick. Today the chronometer reads 11h 59m 57s at the 1200 time tick. What is the chronometer rate?

• (A) -2s o (B) +2s o (C) +3s o (D) -3s


33. Which is a characteristic of a port side daymark?

o (A) Black and white • (B) Numbered o (C) Of any shape o (D) Octagonal



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 34. Which is the dividing meridian between zone descriptions -7 and -8?

• (A) 112°30'E o (B) 118°30'E o (C) 120°00'E o (D) 116°30'W


35. 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. What course should you steer at 12 knots to have the maximum CPA?

o (A) 332° o (B) 339° • (C) 346° o (D) 357°


36. On a nautical chart, what does the inner ring of a compass rose indicate?

o (A) True directions • (B) Magnetic directions o (C) Deviation o (D) Compass error


37. Which is the standard meridian for the time zone +1?

• (A) 15°W o (B) 0° o (C) 7 1/2°W o (D) 7 1/2°E


38. The Sun at a maximum declination north would be approximately at __________

• (A) aphelion o (B) perihelion o (C) autumnal equinox o (D) first point of Aries



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 39. The Sailing Directions (Enroute) contain which information?

o (A) Port facility data • (B) Coastal anchorages o (C) Well-charted inner dangers o (D) Port facilities


40. A ship is in longitude 54°00'W on a true course of 090°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?

• (A) 52°30'W o (B) 45°00'W o (C) 67°30'W o (D) 60°00'W


41. When cold air displaces warm air you have which type of front?

• (A) A cold front o (B) A warm front o (C) An occluded front o (D) A stationary front


42. When the moon is new or full, which type of tides occur?

o (A) Diurnal o (B) Neap • (C) Spring o (D) Apogean


43. Which term describes a light, feathery deposit of ice by sublimation of water vapor directly into the crystalline form on objects whose temperatures are below freezing?

o (A) Dew • (B) Frost o (C) Snow o (D) Glaze



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 44. An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol?

• (A) Diamond with a cross o (B) Circle o (C) Square o (D) Open-faced diamond


45. Tropical storms and hurricanes are most likely to form in the Southern hemisphere during which months?

• (A) January through March o (B) April through May o (C) September through November o (D) June through August


46. Which causes the Earth's irregular heating?

o (A) The geography o (B) The time of day o (C) The seasons • (D) All of the above


47. Your vessel is on a course of 221°T at 15 knots. At 0319 a light bears 198.5°T, and at 0353 the light bears 176°T. At what time and distance off will your vessel be when abeam of the light?

o (A) 0427, 7.4 miles o (B) 0410, 5.2 miles • (C) 0417, 6.0 miles o (D) 0407, 4.3 miles


48. Which may cause above-normal tides near the center of a hurricane?

• (A) Storm surge o (B) Torrential rains o (C) The jet stream o (D) High barometric pressure



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 49. You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears

042° at 105 miles from you. What is the course to steer at 10 knots to intercept vessel A?

o (A) 063° o (B) 068° o (C) 073° • (D) 079°


50. In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate?

• (A) Safe water o (B) A special mark not primarily used for navigation o (C) Isolated danger o (D) Preferred channel


51. Which information is NOT required to be posted in or near the wheelhouse?

• (A) A diagram of advance and transfer for turns of 30°, 60°, 90° and 120° at full speed with maximum rudder and constant power

o (B) For vessels with a fixed propeller, a table of shaft RPMs for a representative range of speeds o (C) Operating instructions for change-over procedures for remote steering gear systems o (D) Stopping time and distance from full speed while maintaining course with minimum rudder


52. Which is TRUE of an aneroid barometer on a vessel?

o (A) It should be mounted in the passenger compartment o (B) It should be protected by a collision bulkhead • (C) It should be permanently mounted o (D) It should located in an air-conditioned area


53. The chart indicates the variation was 3°45'W in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply?

o (A) 3°27'W o (B) 3°27'E • (C) 4°03'W o (D) 4°03'E



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 54. Which is TRUE as the temperature of an air mass decreases?

o (A) The absolute humidity decreases • (B) The relative humidity increases o (C) The dew point rises o (D) The specific humidity decreases


55. The survey information upon which a chart is based is found at which location?

o (A) At the top center of the next line o (B) At any convenient location o (C) At the lower left corner • (D) Near the chart title


56. Isobars on a weather map are useful in predicting which element of the weather?

o (A) The relative humidity • (B) The wind velocity o (C) The temperature o (D) The dew point


57. Buoys which mark dredging areas are painted which color?

o (A) Black • (B) Yellow o (C) Red o (D) Green


58. Which of the four adjustable errors in the sextant causes side error?

• (A) Horizon glass not being perpendicular to the frame o (B) Index mirror not being perpendicular to the frame o (C) Telescope not being parallel to the frame o (D) Elliptical centering error



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 59. In the Northern Hemisphere how do the major ocean currents tend to flow?

o (A) Clockwise or counterclockwise depending on whether it is warm or cold current • (B) Clockwise around the North Atlantic and North Pacific Oceans o (C) Counterclockwise except in the Gulf Stream o (D) Counterclockwise around the North Atlantic and North Pacific Oceans


60. Where is induced magnetism found?

o (A) In vertical iron only o (B) In horizontal iron only o (C) In hard iron • (D) In soft iron


61. What is the standard atmospheric pressure as measured in inches of mercury?

• (A) 29.92 o (B) 500.0 o (C) 760.0 o (D) 1013.2


62. What do red sectors of navigation lights warn mariners of?

o (A) Floating debris o (B) Recently sunken vessels • (C) Shoals or nearby land o (D) Heavily trafficked areas


63. Which is the most commonly encountered fog at sea?

o (A) Radiation fog o (B) Conduction fog • (C) Advection fog o (D) Frontal fog



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2 64. By what means are indications of the master gyrocompass sent to remote repeaters?

o (A) by follow-up system o (B) by phantom element o (C) by azimuth motor • (D) by transmitter


65. Which table is NOT found in the U.S. Coast Pilots?

o (A) Coastwise distance table • (B) Luminous range table o (C) Meteorological table o (D) Climatological table


66. If the electronic chart is part of an ECDIS, it must display the minimum data required by IMO/IHO. Which is NOT required to be displayed?

o (A) Aids to navigation o (B) Regulatory boundaries o (C) Hydrography • (D) tidal currents


67. Which is TRUE concerning Hot air?

o (A) The moisture content of air is independent of air temperature o (B) Hot air retains the same amount of moisture as cold air • (C) Hot air holds more moisture than cold air o (D) Hot air holds less moisture than cold air


68. The velocity of the apparent wind can be more than the true wind, and come from the same direction, if certain conditions are present. One condition is that the __________.

o (A) ship's speed must be less than the true wind velocity • (B) true wind must be from dead ahead o (C) true wind velocity must be faster than the ship's speed o (D) true wind must be from dead astern



8/11/2020

Q139-Navigation General-Oceans U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 Gross Registered Tons Illustrations: 2

69. In illustration D044NG below, what type of buoy is indicated by the letter A?

o (A) Sparo (B) Nuno (C) Pillar• (D) Can


70. What is the length of a nautical mile?

o (A) 2,000 yards• (B) 6,076 feeto (C) 5,280 feeto (D) 1,800 meters



8/11/2020

National Maritime Center

Serving Our Nation’s Mariners

8/29/2018

D025NG

Adapted for testing purposes only from BOWDITCH, The American Practical Navigator,

An Epitome of Navigation, Volume I, 1984 Edition

Copyright © 1984 by the Defense Mapping Agency Hydrographic/Topographic Center

Further reproduction prohibited without permission of 18


National Maritime Center

Serving Our Nation’s Mariners

5/7/2019

D044NG

Adapted for testing purposes only from CUTLER, Dutton’s Nautical Navigation, 15th edition

Copyright © 2004 by the U.S. Naval Institute

Further reproduction prohibited without permission of 18


U.S.C.G. Merchant Marine Exam Mate Less than 500-1600 ......Aug 29, 2019 · Q139-Navigation...

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