單項選擇題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


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1.單項選擇題（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.

A.Recommended Direction of Traffic Flow
B.Roundabout
C.Separation Zone or Line
D.Precautionary Area

2.單項選擇題When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.

A.light characteristic
B.color of the uppermost band
C.shape of an unlighted buoy
D.color of the light

3.單項選擇題What is a lighted safe water mark fitted with to aid in its identification（）.

A.A spherical topmark
B.Red and white retroreflective material
C.A sequential number
D.A red and white octagon

4.單項選擇題A celestial body will cross the prime vertical circle when the latitude is numerically （）.

A.Greater than the declination and both are of the same name
B.Less than the declination and both are of the same name
C.Greater than the declination and both are of contrary name
D.Less than the declination and both are of contrary name

5.單項選擇題When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.

A.the intensity of the light
B.checking the period and characteristics against the Light List
C.the color，because the buoy will have only a red or a green light
D.Any of the above can be used to identify the light

6.單項選擇題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

8.單項選擇題You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.

A.White buoy with a green top
B.White and international orange buoy
C.Yellow buoy
D.Yellow and black vertically-striped buoy

9.單項選擇題You should plot your dead reckoning position（）.

A.From every fix or running fix
B.From every estimated position
C.Every three minutes in pilotage waters
D.Only in pilotage waters