A.AIS
B.ECDIS
C.GPS
D.VDR
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A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
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
最新試題
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
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（）.
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?
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（）.
Radar makes the most accurate determination of the（）.
（）is a digitized“picture”of a chart.
Automatic identification systems（AIS）are required to（）.