A.on loran charts covering areas where sky waves are used
B.in the Radio Aids to Navigation，PUB 117
C.in the Loran-C Correction Tables
D.Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
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A.full confirmation
B.precise appreciation
C.immediate assessment
D.timely recognition
A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
A.brightness of objects
B.color of targets
C.shape of targets
D.bearing of objects
A.Latitude
B.Longitude
C.Speed
D.Time
A.deviation
B.variation
C.local attraction
D.All of the above
最新試題
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
Loran-C is which type of system（）.
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.
Loran-C uses the multiple pulse system because（）.
Automatic identification systems（AIS）are required to（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
The line connecting the Loran-C master station with a secondary station is called the（）.
Which one of the followings does not limit the effective range of radar（）.
When your vessel is proceeding to the area of traffic density，（）is used to determine the exact ranges of other ships or objects in the vicinity.