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
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
Which one of the followings does not limit the effective range of radar（）.
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
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.
（）is not a component of GPS.
（）is not an alarm required by IMO standards to be available on the ECDIS.
The loran lines drawn on navigation charts represent（）.
Radar makes the most accurate determination of the（）.
The information received by AIS will be displayed on（）.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.