A.Ground waves
B.Skywaves
C.Either ground waves or skywaves interchangeably
D.An average between ground wave and skywave positions
您可能感興趣的試卷
你可能感興趣的試題
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
A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
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
最新試題
Loran-C is which type of system（）.
Automatic identification systems（AIS）are required to（）.
Which of the following statements is TRUE regarding crane operations（）.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
Which statement concerning GPS is TRUE（）.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
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.
Radar makes the most accurate determination of the（）.
（）is not a factor which will affect the accuracy of GPS receiver.
The operation of which aids to navigation may be suspended during war or national emergency（）.