单项选择题
A.detective Availability B.local environmental conditions C.autonomous mode versus differential correction mode versus RTCM mode D.the averaging of recorded locations
（）is a digitized“picture”of a chart.A.Vector chart form...
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
The heading of a vessel is indicated by what part of th...
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
The correction to be applied to a Loran-C reading when ...
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
