Which statement about satellite navigation is TRUE? （）<br>A:While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy<br>B:The satellites are in equatorial orbits around the earth about 60°of longitude apart<br>C:The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite<br>D:The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking

Which statement about satellite navigation is TRUE? （）
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

出自：海船船员证

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