A.their transmitters
B.their receivers
C.their radars
D.their lorans
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A.if
B.how
C.when
D.where
A.radar
B.omega
C.satellite navigator
D.DF
A.While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
B.The satellites are in equatorial orbits around the earth about 60°of longitude apart
C.The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
D.The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
最新試題
Automatic identification systems（AIS）are required to（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
Radar makes the most accurate determination of the（）.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
The information received by AIS will be displayed on（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
The line connecting the Loran-C master station with a secondary station is called the（）.
Which statement concerning GPS is TRUE（）.
（）is not a factor which will affect the accuracy of GPS receiver.
In using Loran-C，skywave reception gives greater range but is（）.