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
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
In using Loran-C，skywave reception gives greater range but is（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Which of the following statements is TRUE regarding crane operations（）.
（）is not a factor which will affect the accuracy of GPS receiver.
The operation of which aids to navigation may be suspended during war or national emergency（）.
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
（）is not a component of GPS.
You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made（）.