A.Parallel bearings
B.Long-range bearings
C.Short-range bearings
D.Cross bearings
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A.High frequency pulses
B.Combinations of high and low frequency pulses
C.The same frequency for all stations in a chain
D.Varied long and short pulses
A.An atomic time standard
B.Daylight Savings Time
C.Eastern Standard Time
D.Greenwich Mean Time
A.one
B.two
C.three
D.four
A.Mate's license
B.Restricted radiotelephone operator permit
C.Second-class radio operator's license
D.Seaman's document
A.Navigational satellites
B.Loran
C.Omega
D.Any of the above
最新試題
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（）.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
Radar makes the most accurate determination of the（）.
Which of the following statements is TRUE regarding crane operations（）.
（）is a digitized“picture”of a chart.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
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.
（）is not a factor which will affect the accuracy of GPS receiver.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.