单项选择题
（）is a digitized“picture”of a chart.
A.Vector chart format
B.Raster chart data
C.pixel
D.Electronic Nautical Chart
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The heading of a vessel is indicated by what part of the compass? （）
A.Card
B.Needle
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单项选择题
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
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
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The basic collision avoidance display presented by CASII is designed for easy interpretation and（）of possible collision threat situations.
A.full confirmation
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C.immediate assessment
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