单项选择题
What is the major advantage of high altitude observations?（）
A.Errors due to unusual parallax are eliminated
B.The same body can be used for a fix from observations separated by several minutes
C.The declination is the only information needed from the almanac
D.The semidiameter correction of the sextant altitude is eliminated
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相关考题
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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 -
单项选择题
What indicates a dual purpose buoy? （）
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
