Which information does the outer ring of a compass rose on a nautical chart provide（）.<br>A:variation<br>B:true directions<br>C:magnetic directions<br>D:annual rate of variation change

Which information does the outer ring of a compass rose on a nautical chart provide（）.
A:variation
B:true directions
C:magnetic directions
D:annual rate of variation change

出自：海船船员证

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