What is the Channel Navigation Information Service, or CNIS?

A coastal Vessel Traffic Information Service operated from Dover MRCC by the MCA. CNIS maintains radar surveillance of a large area of the Dover Strait Traffic Separation Scheme (TSS) and makes regular VHF safety broadcasts to shipping. Identified COLREGs breaches by UK vessels are reported to the MCA Enforcement Unit and to the flag State in the case of foreign vessels. A similar service is maintained by CROSS Gris Nez from the French coast to complete coverage of the entire Dover Strait TSS.

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