單項選擇題

（）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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單項選擇題

（）is a digitized“picture”of a chart.

A.Vector chart format
B.Raster chart data
C.pixel
D.Electronic Nautical Chart

單項選擇題

The heading of a vessel is indicated by what part of the compass? （）

A.Card
B.Needle
C.Lubber's line
D.Gimbals