单选题A dead reckoning (DR) plot（）.Amust utilize magnetic coursesBmust take set and drift into accountCshould be replotted hourlyDshould be started each time the vessel's position is fixed
单选题
A dead reckoning (DR) plot（）.
A
must utilize magnetic courses
B
must take set and drift into account
C
should be replotted hourly
D
should be started each time the vessel's position is fixed
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