Your vessel is proceeding down a channel，and you see a pair of range lights that are in line dead ahead．The chart indicates that the direction of this pair of lights is 229°T，and variation is 6°W．If the heading of your vessel at the time of the sighting is 232°per standard magnetic compass，what is the correct deviation ________．
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You are anchoring in a river where the current is from one direction only．The best way to lay out two anchors is to have them ______．
- A.Directly in line with the bow
- B.Side by side，with their lines on the port and starboard side
- C.So that their lines form an angle
- D.On top of one another
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Which statement is TRUE concerning equatorial tides ________．
- A.They occur when the Sun is at minimum declination north or south
- B.They occur when the Moon is at maximum declination north or south
- C.The difference in height between consecutive high or low tides is at a minimum
- D.They are used as the basis for the vulgar establishment of the port
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Which statement is TRUE concerning apogean tides ________．
- A.They occur only at quadrature
- B.They occur when the Moon is nearest the Earth
- C.They cause diurnal tides to become mixed
- D.They have a decreased range from normal
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A wave entering ______ is likely to produce bores．
- A.shallow water
- B.deep water
- C.river
- D.tide
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Tides are superimposed on nontidal rising and falling water levels，caused by ______．
- A.freshets
- B.floods
- C.river flows
- D.seismic events
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Which of the following are data layer categories to be displayed on ECDIS ________．
- A.ECDIS warnings and messages
- B.Hydrographic Office data
- C.Notice to Mariners information
- D.All of the above
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______ is not a type of tide．
- A.SEMIDIURNAL
- B.DIURNAL
- C.MIXED
- D.OSCILLATING
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Which statement concerning current is TRUE ________．
- A.Current can be determined by measuring the direction and distance between simultaneous EP and DR positions
- B.The drift of the current should be averaged out on a one hour basis
- C.After the current is determined，it should not be used for further plotting because it is an unknown variable
- D.The distance between a simultaneous DR position and fix is equal to the drift of the current
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Which buoy will NOT display white retro reflective material ________．
- A.Safe water mark
- B.Isolated danger mark
- C.Preferred channel mark
- D.Daymark of no lateral significance
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When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation ________．
- A.The objects lie in a straight line
- B.The vessel is inside of a triangle formed by the objects
- C.The vessel is outside of a triangle formed by the objects
- D.A circle will pass through your position and the three objects
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