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 information received by AIS will be displayed on（）.
In using Loran-C，skywave reception gives greater range but is（）.
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.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Radar makes the most accurate determination of the（）.
The loran lines drawn on navigation charts represent（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
What does not contribute to the commercial GPS receiver position error（）.
（）is not a factor which will affect the accuracy of GPS receiver.
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（）.