The Consol navigation system，used in Russian and Northern European waters，can be used（）.<br>A:for precise navigation in coastal waters<br>B:by measuring the phase difference of the dots and dashes<br>C:as an aid to ocean navigation<br>D:if the vessel is fitted with a special Consol receiver

The Consol navigation system，used in Russian and Northern European waters，can be used（）.
A:for precise navigation in coastal waters
B:by measuring the phase difference of the dots and dashes
C:as an aid to ocean navigation
D:if the vessel is fitted with a special Consol receiver

出自：海船船员证

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