单项选择题
（）is not a factor which will affect the accuracy of GPS receiver.
A.detective Availability
B.local environmental conditions
C.autonomous mode versus differential correction mode versus RTCM mode
D.the averaging of recorded locations
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（）is a digitized“picture”of a chart.
A.Vector chart format
B.Raster chart data
C.pixel
D.Electronic Nautical Chart -
单项选择题
The heading of a vessel is indicated by what part of the compass? （）
A.Card
B.Needle
C.Lubber's line
D.Gimbals -
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
