You should plot your dead reckoning position（）.<br>A:From every fix or running fix<br>B:From every estimated position<br>C:Every three minutes in pilotage waters<br>D:Only in pilotage waters

You should plot your dead reckoning position（）.
A:From every fix or running fix
B:From every estimated position
C:Every three minutes in pilotage waters
D:Only in pilotage waters

出自：海船船员证

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