单选题A dead reckoning (DR) plot（）.Aignores the effect of surface currentsBis most useful when in sight of landCmust be plotted using magnetic coursesDmay be started at an assumed position
单选题
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
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