Proper GMDSS watchkeeping includes（）.<br>A:understanding the GMDSS console's normal operational indicators<br>B:maintaining a proper GMDSS radio station log<br>C:responding to and comprehending alarms<br>D:All of the above

Proper GMDSS watchkeeping includes（）.
A:understanding the GMDSS console's normal operational indicators
B:maintaining a proper GMDSS radio station log
C:responding to and comprehending alarms
D:All of the above

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