单项选择题

A.Great CircleB.Position LineC.Rhumb lineD.True Bearing……

（）means the curve on the earth’s surface which cuts all the meridians at the same angle.

A.Great Circle
B.Position Line
C.Rhumb line
D.True Bearing

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单项选择题（）is the process by which the position of the vessel at any moment is found by applying the last well-determined position to the run that has been made since，using for this purpose the ship’s course and the distance being those indicated by log.

A.dead reckoning
B.dead weight
C.dead slow ahead
D.dead slow astern

单项选择题Leeway is the（）.

A.difference between the true course and the compass course
B.momentum of a vessel after her engines have been stopped
C.lateral movement of a vessel downwind of her intended course
D.displacement of a vessel multiplied by her speed