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
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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
A.Ground waves
B.Skywaves
C.Either ground waves or skywaves interchangeably
D.An average between ground wave and skywave positions
最新試題
Loran-C uses the multiple pulse system because（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
The heading of a vessel is indicated by what part of the compass? （）
What does not contribute to the commercial GPS receiver position error（）.
（）is not a component of GPS.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.