单项选择题
A.He space component B.Control component C.User component D.Alarming component
（）is not an alarm required by IMO standards to be avail...
单项选择题（）is not an alarm required by IMO standards to be available on the ECDIS.
A.Deviating from a planned route B.Approach to waypoints and other critical points C.Light house detecting D.Larger scale chart available
（）is not a factor which will affect the accuracy of GPS...
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
（）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
