A.two stations，including one on the nearest coast
B.two stations，including one on the nearer coast
C.three stations，including one on the farthest coast
D.three stations，including one on the nearest coast
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A.parallel bearings
B.long-range bearings
C.short-range bearings
D.cross bearings
A.their transmitters
B.their receivers
C.their radars
D.their lorans
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
Which of the following statements is TRUE regarding crane operations（）.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
Automatic identification systems（AIS）are required to（）.
The loran lines drawn on navigation charts represent（）.
Loran-C is which type of system（）.
（）is not a factor which will affect the accuracy of GPS receiver.
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.