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C

CCIR

The Consultative Committee on International Radio (Replaced by the ITU–R). Formulated new technical standards for radio equipment and the recommendations on the use of radio spectrum.

CIRM

Centro Internazionale Radio Medico. International Radio Medical Centre based in Rome.

Coast Station

A land station in the maritime mobile service providing terrestrial communications to and from ships at sea.

COMSAR

Communications Search and Rescue. IMO Sub–committee on Radiocommunications and Search and Rescue. Replaced by the NCSR.

COSPAS–SARSAT

Cosmicheskaya Sistyema Poiska Avariynich Sudov–Search and Rescue Satellite Aided Tracking. A satellite–aided search and rescue system. Designed to locate emergency radio beacons transmitting on the frequencies of 406.025, 406.028 and 406.037 MHz, with 121.5 MHz for homing.

CQ

General call to all stations. Frequently used in Morse transmissions, and sometimes in voice communications.

CTR

Conformance Test Report. A report certifying LRIT conformance as per SOLAS regulations.