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
Loran-C is which type of system（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
Would you mind（）your DF?
In using Loran-C，skywave reception gives greater range but is（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
What does not contribute to the commercial GPS receiver position error（）.
Automatic identification systems（AIS）are required to（）.
（）is not a component of GPS.
The heading of a vessel is indicated by what part of the compass? （）
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.