A.only accurate during daylight hours
B.much less accurate
C.only accurate at twilight
D.more accurate than using ground waves
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A.Skip zone
B.Blackout zone
C.Diffraction zone
D.Shadow zone
A.provide safety-related information automatically to shore stations，other vessels and aircraft
B.receive safety-related information automatically from similarly equipped vessels
C.exchange safety-related information with shore-based facilities
D.All of the above
A.He space component
B.Control component
C.User component
D.Alarming component
A.Deviating from a planned route
B.Approach to waypoints and other critical points
C.Light house detecting
D.Larger scale chart available
A.detective Availability
B.local environmental conditions
C.autonomous mode versus differential correction mode versus RTCM mode
D.the averaging of recorded locations
最新試題
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.
（）is not a component of GPS.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Would you please（）on the radar?
（）is a digitized“picture”of a chart.
In using Loran-C，skywave reception gives greater range but is（）.
Which statement concerning GPS is TRUE（）.
The information received by AIS will be displayed on（）.
Loran-C is which type of system（）.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.