单项选择题

What is the light characteristic of a lighted，preferred-channel buoy? （）

A.Group flashing
B.Composite group flashing
C.Interrupted quick flashing
D.Fixed and flashing

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单项选择题

A.Red buoy with a horizontal yellow band
B.Red and white vertically-striped buoy with a vertical yellow stripe
C.Red and white vertically-striped buoy with a red spherical topmark
D.Green buoy with a yellow square

单项选择题

What describes an accurate position that is NOT based on any prior position? （）

A.Dead-reckoning position
B.Estimated position
C.Fix
D.Running fix