ITU Radio Regulations and Space Security Standards
RR Chapter VII: Distress and safety communications – ITU Radio Regulations and Space Security Standards

ITU Radio Regulations and Space Security Standards RR31: RR Article 31: Frequencies for the GMDSS

What does RR31 require?

GMDSS distress and safety frequencies are those of Appendix 15 (31.1); emissions causing harmful interference to distress and safety on those discrete frequencies are prohibited (31.2); tests are minimized, coordinated and identified (31.3); stations listen before transmitting on them (31.4); survival craft equipment capabilities are prescribed, including 9 200-9 500 MHz or AIS locating signals (31.6 to 31.11); coast stations and coast earth stations with GMDSS responsibility keep automatic watch, and ships keep DSC watch at sea and receive maritime safety information (31.13 to 31.20). New GSO GMDSS bands under Resolution 365 (WRC-23) enter into force only once its coordination conditions are met.

Maintained by Gerard BlokdykVerified against the published standard Control text last updated

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