A.one
B.two
C.three
D.four
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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.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
最新試題
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
The loran lines drawn on navigation charts represent（）.
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
Automatic identification systems（AIS）are required to（）.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
Which of the following statements is TRUE regarding crane operations（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
（）is not a factor which will affect the accuracy of GPS receiver.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
Radar makes the most accurate determination of the（）.