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 heading of a vessel is indicated by what part of the compass? （）
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
The loran lines drawn on navigation charts represent（）.
In using Loran-C，skywave reception gives greater range but is（）.
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.
Which of the following statements is TRUE regarding crane operations（）.
The information received by AIS will be displayed on（）.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.