You should plot your dead reckoning position at（）.<br>A:every fix or running fix<br>B:every course change<br>C:every speed change<br>D:All of the above are correct

You should plot your dead reckoning position at（）.
A:every fix or running fix
B:every course change
C:every speed change
D:All of the above are correct

出自：海船船员证

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