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
You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
Which statement concerning GPS is TRUE（）.
Automatic identification systems（AIS）are required to（）.