You should plot your dead reckoning position（）.<br>A:when you obtain an estimated position<br>B:only in piloting waters <br>C:at every speed change<br>D:All of the above are correct

You should plot your dead reckoning position（）.
A:when you obtain an estimated position
B:only in piloting waters
C:at every speed change
D:All of the above are correct

出自：海船船员证

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