A.if
B.how
C.when
D.where
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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
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
Loran-C is which type of system（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
Radar makes the most accurate determination of the（）.
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.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
Would you mind（）your DF?