单项选择题
When your vessel is proceeding to the area of traffic density，（）is used to determine the exact ranges of other ships or objects in the vicinity.
A.Radar
B.GPS
C.DF
D.Satellite Navigator
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相关考题
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单项选择题
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
A.10 meters
B.20 meters
C.50 meters
D.100 meters -
单项选择题
What does not contribute to the commercial GPS receiver position error（）.
A.Satellite clock
B.Ship's speed
C.Atmospheric/ionospheric propagation
D.Receiver -
单项选择题
To obtain accuracy in fixing by DF，（）and three stations should be used.
A.Parallel bearings
B.Long-range bearings
C.Short-range bearings
D.Cross bearings
