A.Vector chart format
B.Raster chart data
C.pixel
D.Electronic Nautical Chart
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A.Card
B.Needle
C.Lubber's line
D.Gimbals
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
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
最新試題
The operation of which aids to navigation may be suspended during war or national emergency（）.
Would you please（）on the radar?
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（）.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
Radar makes the most accurate determination of the（）.
The information received by AIS will be displayed on（）.
Loran-C uses the multiple pulse system because（）.
The line connecting the Loran-C master station with a secondary station is called the（）.
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.