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
In using Loran-C，skywave reception gives greater range but is（）.
The heading of a vessel is indicated by what part of the compass? （）
Which one of the followings does not limit the effective range of radar（）.
Radar makes the most accurate determination of the（）.
What does not contribute to the commercial GPS receiver position error（）.
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（）.
The loran lines drawn on navigation charts represent（）.
Which of the following statements is TRUE regarding crane operations（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
Loran-C uses the multiple pulse system because（）.