A.parallel bearings
B.long-range bearings
C.short-range bearings
D.cross bearings
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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
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Loran-C uses the multiple pulse system because（）.
Radar makes the most accurate determination of the（）.
Automatic identification systems（AIS）are required to（）.
Which statement concerning GPS is TRUE（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
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（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
（）is a digitized“picture”of a chart.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.