A.buoys close at hand
B.fixed known objects on shore
C.buoys at a distance
D.All of the above
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A.running fix
B.fix
C.estimated position
D.assumed position
A.true north
B.magnetic north
C.the vessel's beam
D.the vessel's head
A.estimated position
B.fix
C.running fix
D.dead-reckoning position
A.dead reckoning position
B.estimated position
C.fix
D.None of the above
A.running fix
B.dead-reckoning position
C.fix
D.estimated position
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A celestial body will cross the prime vertical circle when the latitude is numerically （）.
What describes a flood current（）.
When navigating a vessel，you（）.
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
How would you pass a red buoy in the maritime buoyage system“A” （）.
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The equator is（）.
What is a lighted safe water mark fitted with to aid in its identification（）.
Restricted areas at locks and dams are indicated by（）.
When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.