A.Mate's license
B.Restricted radiotelephone operator permit
C.Second-class radio operator's license
D.Seaman's document
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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
A.Focus line
B.Base line
C.Side line
D.Center line
A.DCU
B.UTC
C.ENC
D.MENU
A.AIS
B.ECDIS
C.GPS
D.VDR
最新試題
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
Loran-C is which type of system（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Loran-C uses the multiple pulse system because（）.
The line connecting the Loran-C master station with a secondary station is called the（）.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.