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
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A.Mate's license
B.Restricted radiotelephone operator permit
C.Second-class radio operator's license
D.Seaman's document
A.Pulse width
B.Pulse repetition frequency
C.Peak power
D.Target brightness
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.Switch
B.To switch
C.Switched
D.Will switch
A.Parallel bearings
B.Long-range bearings
C.Short-range bearings
D.Cross bearings
A.A decreasing reading on loran pair 9960-X
B.The bearing of Wolf Trap Light changing to the right
C.Increasing soundings
D.The bearing of Wolf Trap Light changing to the left
A.Bell alarm to warn the user
B.Lighted alarm signal to warn the user
C.Alternate signal keying system
D.View finder for each station
A.provide safety-related information automatically to shore stations，other vessels and aircraft
B.receive safety-related information automatically from similarly equipped vessels
C.exchange safety-related information with shore-based facilities
D.All of the above
A.DCU
B.UTC
C.ENC
D.MENU
A.one
B.two
C.three
D.four
最新試題
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
Would you please（）on the radar?
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（）.
Would you mind（）your DF?
Automatic identification systems（AIS）are required to（）.
Loran-C is which type of system（）.
（）is a digitized“picture”of a chart.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.