单项选择题

A.should never use radar bearingsB.should only use rada……

A navigator fixing a vessel’s position by radar （）.

A.should never use radar bearings
B.should only use radar bearings when the range exceeds the distance to the horizon
C.can use radar information from one object to fix the position
D.must use information from targets forward of the beam

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单项选择题A line of position derived by radar range from an identified point on a coast will be a(n) （）.

A.straight line
B.arc
C.parabola
D.line parallel to the coast

单项选择题A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and （）.

A.one sidelight and the masthead light are visible
B.the vessels will pass closer than half a mile
C.both vessels sound one prolonged blast
D.both sidelights and masthead light(s) are visible

单项选择题The Sailing Directions contain information on （）.

A.required navigation lights
B.lifesaving equipment standards
C.casualty reporting procedures
D.currents in various locations

单项选择题You will find information about the duration of slack water in the （）.

A.Tidal Current Tables
B.Tide Tables
C.American Practical Navigator
D.Sailing Directions

单项选择题（）amplify charted detail and contain information needed for safe navigation.

A.Admiralty Sailing Directions
B.Admiralty List of Lights
C.Admiralty List of Signals
D.Admiralty Notices to Mariners