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
The loran lines drawn on navigation charts represent（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Radar makes the most accurate determination of the（）.
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.
Loran-C uses the multiple pulse system because（）.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
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（）.
What does not contribute to the commercial GPS receiver position error（）.
Automatic identification systems（AIS）are required to（）.
Loran-C is which type of system（）.