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
C.Lubber's line
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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
D.Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading

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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
B.precise appreciation
C.immediate assessment
D.timely recognition