单项选择题

（）is not a component of GPS.

A.He space component
B.Control component
C.User component
D.Alarming component

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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

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

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