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
（）is not an alarm required by IMO standards to be available on the ECDIS.
What does not contribute to the commercial GPS receiver position error（）.
（）is not a component of GPS.
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.
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（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
Which one of the followings does not limit the effective range of radar（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Would you mind（）your DF?