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
（）is not a factor which will affect the accuracy of GPS receiver.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
（）is a digitized“picture”of a chart.
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
Which statement concerning GPS is TRUE（）.
（）is not a component of GPS.
Loran-C is which type of system（）.
Which of the following statements is TRUE regarding crane operations（）.
In using Loran-C，skywave reception gives greater range but is（）.