A.gyro-compass
B.marine radar
C.DF
D.navigational satellite
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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
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
最新試題
Loran-C is which type of system（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
The line connecting the Loran-C master station with a secondary station is called the（）.
Would you mind（）your DF?
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
The information received by AIS will be displayed on（）.
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.