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Testing the equipment used for distress and safety on HF






The procedure for testing the ship's equipment used for DSC distress, urgency and safety calls on HF by transmitting DSC test calls on HF DSC distress channels is the same as for testing on the MF DSC distress frequency 2187.5 Hz.

 

 


4.

Maritime Mobile Service Identity (MMSI)

The International Telecommunications Union

The International Telecommunications Union in Geneva, Switzerland, oversees the use and assignment of maritime mobile service identities. The information contained here is incomplete, adapted from regulations and recommendations of the ITU, and practices within the United States. For complete information, we recommend you obtain the relevant information directly from the ITU.

What MMSIs are

(Adapted from Appendix 43 of the International Telecommunications Union Radio Regulations)

Maritime Mobile Service Identities are formed of a series of nine digits which are transmitted over the radio path in order to uniquely identify ship stations, ship earth stations, coast stations, coast earth stations, and group calls. These identities are formed in such a way that the identity or part thereof can be used by telephone and telex subscribers connected to the general telecommunications network principally to call ships automatically.

There are four kinds of maritime mobile service identities:

  • Ship station identities,
  • Group ship station identities,
  • Coast station identities,
  • Group coast station identities.

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