Assessment Test

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1. The upper vertex of a great circle track is in LONG 156°00'E. Sailing eastward, the great circle track will cross the equator in LONG

 
 

2. From LAT 07°12'N, LONG 80°00'W, to LAT 47°12'S, LONG 169°18'E, the initial great circle course angle is 137.25°. How would you name this course?

 
 

3. For navigational purposes, each great circle on the Earth has a length of __________.

 
 

4. Which statement(s) concerning the effect of Coriolis force on ocean currents is(are) correct?

 
 

5. You are on a voyage from New Orleans to Boston. When navigating off the Florida coast, you will get the greatest benefit from the Gulf Stream if you navigate __________.

 
 

6. A coastal current __________.

 
 

7. Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes?

 
 

8. The speed of an ocean current is dependent on __________.

 
 

9. In which month will the equatorial counter current be strongest?

 
 

10. Which current would you encounter on a direct passage from southern Africa to Argentina, South America?

 
 

11. On a voyage from Halifax, N.S., to Dakar, West Africa, the Canary Current will __________.

 
 

12. 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 encounter __________.

 
 

13. You are on a voyage from New Orleans to Boston and navigating off the Florida coast. You will get the greatest benefit from the Gulf Stream if you navigate __________.

 
 

14. The two most effective generating forces of surface ocean currents are __________.

 
 

15. Where would you find information about the time of high tide at a specific location on a particular day of the year?

 
 

16. The datum from which the predicted heights of tides are reckoned in the tide tables is the same as that used for the charts of the locality. The depression of the datum below mean sea level for Hampton Roads, Virginia is __________.

 
 

17. How many high waters usually occur each day on the East Coast of the United States?

 
 

18. You will find information about the duration of slack water in the __________.

 
 

19. Information about direction and velocity of rotary tidal currents is found in the __________.

 
 

20. Which of the Great Lakes is most affected by short-term Lake level fluctuations?

 
 

21. Your vessel is approaching the International Bridge on the St. Marys River. If the gage on the bridge, read from top to bottom, indicates 124 ft. and the IGLD (1955) is 600 ft., determine the actual vertical clearances between the existing water level and the lowest point of the bridge over the channel.

 
 

22. Which statement is TRUE concerning weather conditions on the Great Lakes?

 
 

23. Which statement concerning storm surges on the Great Lakes is FALSE?

 
 

24. On the Great Lakes, winter storms compound the ice threat by bringing a variety of wind, wave, and weather problems on an average of every __________.

 
 

25. A vessel operating on the Great Lakes, and whose position is southeast of an eastward-moving storm center, would NOT experience __________.

 
 

26. The Great Lakes Edition of the Notice to Mariners is published __________.

 
 

27. You are bound from port A governed by the summer load line mark to port B also governed by the summer mark. The great circle track will take you into a zone governed by the winter mark. Which statement is TRUE?

 
 

28. A tropical storm is building strength some distance from your MODU. Waves are coming from the east, with periods increasing from 5 seconds to 15 seconds. The swell is from the east. Where was the storm when these new swells were generated?

 
 

29. What kind of conditions would you observe as the eye of a storm passes over your MODU's position?

 
 

30. Under the IALA Buoyage Systems, a cardinal mark may NOT be used to __________.

 
 

31. 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 __________.

 
 

32. Under the IALA cardinal system, a mark with a quick light showing 9 flashes every 15 seconds indicates that the safest water is on the __________.

 
 

33. You are underway on course 328°T when you sight a buoy broad on your port bow. You are in the best navigable water if the buoy __________.

 
 

34. What is a characteristic of cardinal marks?

 
 

35. Two navigational hazards are located near to each other, but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by __________.

 
 

36. You are on course 238°T. To check the course of your vessel you should observe a celestial body on which bearing?

 
 

37. In which voyage, between two points, is the rhumb line distance NOT approximately the same as the great circle distance?

 
 

38. The latitude of the upper vertex of a great circle is 36°N. What is the latitude of the lower vertex?

 
 

39. A great circle crosses the equator at 134°E. It will also cross the equator at what other longitude?

 
 

40. A great circle track provides the maximum saving in distance on __________.

 
 

41. In the Northern Hemisphere the major ocean currents tend to flow __________.

 
 

42. In the Sargasso Sea there are large quantities of seaweed and no well defined currents. This area is located in the

 
 

43. On an Atlantic Ocean voyage from New York to Durban, South Africa, you should expect the Agulhas Current to present a strong __________.

 
 

44. The north equatorial current flows to the __________.

 
 

45. Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the __________.

 
 

46. Which ocean current is "warm" based on the latitude in which it originates and on the effect it has on climate?

 
 

47. On a voyage from Cape Town to London, the favorable ocean current off the coast of Africa is the __________.

 
 

48. The approximate mean position of the axis of the Gulf Stream east of Palm Beach, FL, is __________.

 
 

49. Information about currents on the Pacific Coast of the U. S. are found in the __________.

 
 

50. Where would you find information concerning the duration of slack water?

 
 

51. In a river subject to tidal currents, the best time to dock a ship without the assistance of tugs is __________.

 
 

52. When daylight savings time is kept the times of tide and current calculations must be adjusted. One way of doing this is to __________.

 
 

53. The time meridian used when computing the height of tide or the velocity of the current for Pensacola Bay, FL, is __________.

 
 

54. The time meridian used for tide computations in New York Harbor is __________.

 
 

55. With respect to a reversing current, slack water occurs when there is __________.

 
 

56. The set of the current is the __________.

 
 

57. The drift and set of tidal, river, and ocean currents refer to the __________.

 
 

58. A swift current occurring in a narrow passage connecting two large bodies of water, which is produced by the continuously changing difference in height of tide at the two ends of the passage, is called a __________.

 
 

59. Current refers to the __________.

 
 

60. In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream, and is called a __________.

 
 

61. Spring tides occur __________.

 
 

62. The class of tide that prevails in the greatest number of important harbors on the Atlantic Coast is __________.

 
 

63. What does the term "tide" refer to?

 
 

64. Mean low water is the average height of __________.

 
 

65. The vertical distance from the tidal datum to the level of the water is the __________.

 
 

66. The height of tide is the __________.

 
 

67. The difference between the heights of low and high tide is the __________.

 
 

68. The range of tide is the __________.

 
 

69. "Stand" of the tide is that time when __________.

 
 

70. What is an ebb current?

 
 

71. Set of the current is __________.

 
 

72. Storms that enter the Great Lakes Basin from the west and northwest at a peak in October are the products of pressure systems known as __________.

 
 

73. The vertical reference for all water levels and bench marks on the Great Lakes - St. Lawrence River System is known as __________.

 
 

74. How are aids to navigation on the Great Lakes arranged geographically?

 
 

75. In an easterly and southerly direction, except on Lake Erie

 
 

76. Which two Great Lakes are considered hydraulically as one?

 
 

77. When crossing a bar in rough weather, you should enter on a(n) __________.

 
 

78. Which basic category of water level fluctuations on the Great Lakes is the most regular?

 
 

79. Which of the Great Lakes experiences the least amount of water level fluctuation between seasonal high and low water marks?

 
 

80. Assume that your vessel has just entered Lake Michigan via the Straits of Mackinac and is proceeding south to Chicago. Which statement is TRUE with respect to the aids to navigation you will encounter along this route?

 
 

81. The Lake Carriers Association and the Canadian Shipowners Association prescribe separation routes for upbound and downbound vessels on the Great Lakes. The recommended courses for these routes are shown on the Great Lakes Charts in the form of __________.

 
 

82. Assume that your vessel has just entered Lake Erie by way of the Welland Canal and is proceeding in a southwesterly direction. Which statement about the aids to navigation you can expect to encounter along the route is TRUE?

 
 

83. Nearly half of all storms that enter the Great Lakes Basin during the period from October through May come from __________.

 
 

84. Advection fog holds longest over which portions of the lakes?

 
 

85. Fog can form in any season on the Great Lakes, but it is most likely to occur over open waters in __________.

 
 

86. On which of the Great Lakes would shore ice be the most pronounced?

 
 

87. A hurricane has recurved to the northeast and its forward speed is 20 knots. Your MODU is located 600 miles northeast of the hurricane's center. How long will it take for the hurricane center to reach your position if it holds its present course and speed?

 
 

88. Apparent wind speed blowing across a MODU under tow can be measured by a(n) __________.

 
 

89. A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the __________.

 
 

90. Under the IALA cardinal system, a mark with a quick white light showing 6 flashes followed by one long flash indicates that the safest water is on the __________.

 
 

91. The characteristic of a lighted cardinal mark may be __________.

 
 

92. While steering a course of 150°T, you wish to observe the Sun for a speed check. What would the azimuth have to be?

 
 

93. You are on course 042°T. To check the course of your vessel you should observe a celestial body on which bearing?

 
 

94. What is NOT an advantage of the rhumb line track over a great circle track?

 
 

95. A great circle crosses the equator at 162°E. It will also cross the equator at what other longitude?

 
 

96. A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude?

 
 

97. A great circle crosses the equator at 157°W. It will also cross the equator at what other longitude?

 
 

98. The distance to the nearest vertex from any point on a great circle track cannot exceed __________.

 
 

99. What is the major advantage of a rhumb line track?

 
 

100. The vertex of a great circle track is in LONG 109°E. An eastbound vessel would cross the equator in LONG __________.

 
 


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