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 use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
（）is not a factor which will affect the accuracy of GPS receiver.
To obtain accuracy in fixing by DF，（）and three stations should be used.
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（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
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.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
The loran lines drawn on navigation charts represent（）.
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
Radar makes the most accurate determination of the（）.