Assessment Test

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1. You are steaming along the coast of Ireland in the Irish Sea. You sight a lighted buoy with a white flashing light showing a group of two flashes. The buoy indicates you __________.


2. In waters where the cardinal system is used you would expect to find danger __________.


3. You are underway on course 142°T when you sight a buoy bearing 105°T. The buoy's white light has a characteristic of continuous very-quick flashing. To ensure that your vessel remains in the best navigable water you would __________.


4. You are underway in the North Sea on course 216°T when you sight a buoy bearing 021° relative. Under the IALA Buoyage System, you are in the best navigable water if the buoy __________.


5. You are on course 090°T when you sight a flashing white light with a characteristic of VQ(9)10s. You immediately change course to 030°T. After one hour, you sight another flashing white light with the characteristic of VQ. You must pass well __________.


6. You are on course 209°T. In order to check the longitude of your vessel, you should observe a celestial body on which bearing?


7. You are on course 146°T. To check the speed of your vessel you should observe a celestial body on which bearing?


8. A star is observed at lower transit. The line of position derived from this sight is __________.


9. You are on course 303°T. To check the speed of your vessel you should observe a celestial body on which bearing?


10. You are on course 061°T. To check the longitude of your vessel you should observe a celestial body on which bearing?


11. A great circle crosses the equator at 173°E. It will also cross the equator at what other longitude?


12. A great circle will intersect the equator at how many degrees of longitude apart?


13. When is the rhumb line distance the same as the great circle distance?


14. What defines a great circle?


15. The Humboldt Current flows in which direction?


16. As the South Equatorial Current approaches the east coast of Africa, it divides with the main part flowing south to form the warm __________.


17. What current flows southward along the west coast of the United States and causes extensive fog in that area?


18. The Brazil Current flows in which general direction?


19. The steady current circling the globe at about 60°S is the __________.


20. The West Wind Drift is located __________.


21. The current that, in many respects, is similar to the Gulf Stream is the __________.


22. Ocean currents are well defined and __________.


23. In order to get the maximum benefit from the Gulf Stream, on a voyage between Houston and Philadelphia, you should navigate __________.


24. You are bound for Baltimore via Cape Henry on a 15 knot ship. If the flood at Chesapeake Bay entrance begins at 1800 EST (ZD +5), at what time would you depart from the Chesapeake Bay entrance to have the most favorable current?


25. Where can information about the currents for the Pacific Coast of the U. S. be obtained?


26. Data relating to the direction and velocity of rotary tidal currents can be found in the __________.


27. The velocity of the current in large coastal harbors is __________.


28. Your vessel goes aground in soft mud. You would have the best chance of refloating it on the next tide if it grounded at __________.


29. When the moon is at first quarter or third quarter phase, what type of tides will occur?


30. Neap tides occur __________.


31. Neap tides occur when the __________.


32. When the Moon's declination is maximum north, which of the following will occur?


33. Which statement is TRUE concerning equatorial tides?


34. The average height of the surface of the sea for all stages of the tide over a 19 year period is called __________.


35. A tide is called diurnal when __________.


36. When there are small differences between the heights of two successive high tides or two low tides, in a tidal day, the tides are called __________.


37. The point where the vertical rise or fall of tide has stopped is referred to as __________.


38. The period at high or low tide during which there is no change in the height of the water is called the __________.


39. You are transiting the Straits of Mackinac by way of an improved channel. You have information which indicates that the channel's Federal project depth is 28 ft. Which of the following statements is true with regards to this channel?


40. Which of the Great Lakes is generally the last to reach its seasonal low and seasonal high water marks?


41. "Seiche" is defined as a(n) __________.


42. There are basically three categories of water level fluctuations on the Great Lakes. What is NOT included as one of these?


43. Which of the Great Lakes lies entirely within the United States?


44. On the Great Lakes, the term "controlling depth" means the __________.


45. Nautical charts published by the Canadian Hydrographic service which are referenced in the United States Coast Pilot are identified by __________.


46. Advection fog, a common occurrence on the Great Lakes, forms when __________.


47. What is NOT characteristic of the conditions which would be experienced by a vessel located southeast of an approaching eastward-moving storm center on the Great Lakes?


48. The edge of a hurricane has overtaken your MODU in the Gulf of Mexico and the northwest wind of a few hours ago has shifted to the west. This is an indication that you are located in the __________.


49. You are at sea and have received a General Emergency message announcing the outbreak of war in Europe. You are directed to comply with the instructions in NGA (NIMA) PUB 117, Chapter Eight. Which statement is TRUE?


50. On approaching the English Channel on course 080°T, you note the symbol YBY near a charted buoy. You must pass __________.


51. A line of position from a celestial observation is a segment of a __________.


52. A latitude line will be obtained by observing a body __________.


53. While steering a course of 150°T, you wish to observe a body for a latitude check. What would the azimuth have to be?


54. You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing?


55. You are on course 226°T. In order to check the latitude of your vessel, you should observe a celestial body on which bearing?


56. You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing?


57. You are on course 201°T. To check the speed of your vessel you should observe a celestial body on which bearing?


58. A great circle crosses the equator at 141°E. It will also cross the equator at what other longitude?


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


60. A great circle crosses the equator at 17°W. It will also cross the equator at what other longitude?


61. The distance in longitude from the intersection of a great circle and the equator to the lower vertex is how many degrees of longitude?


62. The longitude of the upper vertex of a great circle track is 169°E. What is the longitude of the lower vertex?


63. The initial great circle course angle between LAT 23°00'S, LONG 42°00'W and LAT 34°00'S, LONG 18°00'E is 063.8°. What is the true course?


64. What is a characteristic of a rhumb line?


65. Except for N-S courses, and E-W courses on the equator, a great circle track between two points, when compared to a rhumb line track between the same two points, will __________.


66. The cold ocean current which meets the warm Gulf Stream between latitudes 40° and 43°N to form the "cold wall" is called the __________.


67. Generally speaking, a ship steaming across the North Pacific from Japan to Seattle is likely to experience __________.


68. Which statement is TRUE concerning the current of the Gulf Stream?


69. When a current flows in the opposite direction to the waves, the wave __________.


70. The set of the equatorial countercurrent is generally to the __________.


71. The Benguela Current flows in a __________.


72. Which current would you encounter on a direct passage from London, England, to Cape Town, South Africa?


73. You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.


74. When the declination of the Moon is 0°12.5'S, you can expect some tidal currents in Gulf Coast ports to __________.


75. A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately __________.


76. The velocity of a rotary tidal current will be decreased when the Moon is __________.


77. To predict the actual depth of water using the Tide Tables, the number obtained from the Tide Tables is __________.


78. The time meridian that is used when computing the currents for Pensacola Bay, Florida, is __________.


79. The tides in Boston Harbor generally __________.


80. Spring tides occur when the __________.


81. The lunar or tidal day is __________.


82. Neap tides occur only __________.


83. In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n) __________.


84. Tropic tides are caused by the __________.


85. What describes a flood current?


86. Priming of the tides occurs __________.


87. The distance between the surface of the water and the tidal datum is the __________.


88. What is the definition of height of tide?


89. Spring tides are tides that __________.


90. Which term refers to the direction a current is flowing?


91. Which of the Great Lakes generally has the shortest navigation season?


92. A channel is stated as having a controlling depth of 38 feet. Which statement is TRUE?


93. Which publication offers information on Great Lakes ice services?


94. Your vessel is underway and approaching an overhead obstruction on Lake Superior. Given the following information, determine the clearance between your vessel and the obstruction. Highest point on vessel: 74 ft. Lowest point of obstruction: 126 (LWD) Monthly lake level: +2 (LWD) International Great Lakes Datum: 600.0 (182.88 meters)


95. Which type of fog is the most dense and widely spread of those that occur on the Great Lakes?


96. The phenomenon known as a "seiche" is most likely to occur on Lake Erie __________.


97. On the Great Lakes, short-term fluctuations in water levels may be a result of any of the following EXCEPT __________.


98. Generally speaking, the more destructive storms occurring on the Great Lakes usually come from the __________.


99. When the air temperature is just below 32°F, snow FIRST adheres to __________.


100. While steaming on course 280°T, you sight a buoy showing a very quick-flashing (VQ) white light well to port. Maintaining course, you sight another buoy showing a quick-flashing (Q) white light. You should pass __________.


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