单项选择题
A red triangular daymark marks （）.
A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.an area of a channel where passing another vessel is permitted
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A rapid rise or fall of the barometer indicates（）.
A.heavy rain within six hours
B.a decrease in wind velocity
C.a change in the present weather conditions
D.that fog will soon set in -
单项选择题
A radar range to a small，charted object such as a light will provide a line of position in which form? （）
A.Straight line
B.Arc
C.Parabola
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A quick and rapid motion of a ship in a seaway is an indication of a(n) （）.
A.large GM
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