A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
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A.Bell alarm to warn the user
B.Lighted alarm signal to warn the user
C.Alternate signal keying system
D.View finder for each station
A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity
A.Reflected electron
B.Electrical radiation
C.Quarterpoint electrical navigation
D.Hyperbolic radio navigation
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
最新試題
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
Automatic identification systems（AIS）are required to（）.
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（）.
Which statement concerning GPS is TRUE（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
Would you mind（）your DF?
When your vessel is proceeding to the area of traffic density，（）is used to determine the exact ranges of other ships or objects in the vicinity.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.