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
What does not contribute to the commercial GPS receiver position error（）.
The line connecting the Loran-C master station with a secondary station is called the（）.
Loran-C uses the multiple pulse system because（）.
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
Would you mind（）your DF?
The loran lines drawn on navigation charts represent（）.
Radar makes the most accurate determination of the（）.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Which one of the followings does not limit the effective range of radar（）.