A.Reflected electron
B.Electrical radiation
C.Quarterpoint electrical navigation
D.Hyperbolic radio navigation
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A.only accurate during daylight hours
B.much less accurate
C.only accurate at twilight
D.more accurate than using ground waves
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
最新試題
（）is not a component of GPS.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
In using Loran-C，skywave reception gives greater range but is（）.
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（）.
（）is not a factor which will affect the accuracy of GPS receiver.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
Loran-C uses the multiple pulse system because（）.
The loran lines drawn on navigation charts represent（）.