A dead reckoning (DR) plot（）.<br>A:ignores the effect of surface currents<br>B:is most useful when in sight of land<br>C:must be plotted using magnetic courses<br>D:may be started at an assumed position

A dead reckoning (DR) plot（）.
A:ignores the effect of surface currents
B:is most useful when in sight of land
C:must be plotted using magnetic courses
D:may be started at an assumed position

出自：海船船员证

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