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
The heading of a vessel is indicated by what part of the compass? （）
Automatic identification systems（AIS）are required to（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
The operation of which aids to navigation may be suspended during war or national emergency（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
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.
Would you mind（）your DF?
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.