A.radar
B.omega
C.satellite navigator
D.DF
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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 operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
Loran-C uses the multiple pulse system because（）.
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（）.
Automatic identification systems（AIS）are required to（）.
The information received by AIS will be displayed on（）.
Which of the following statements is TRUE regarding crane operations（）.
（）is a digitized“picture”of a chart.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.