A dead reckoning (DR) plot（）.<br>A:must utilize magnatic courses<br>B:must take set and drift into account<br>C:should be replotted hourly<br>D:should be started each time the vessels position is fixed

A dead reckoning (DR) plot（）.
A:must utilize magnatic courses
B:must take set and drift into account
C:should be replotted hourly
D:should be started each time the vessels position is fixed

出自：海船船员证

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