Radio Regulations

Source: the Radio Regulations published by the International Telecommunication Union (ITU).

All IBR Recommendations

As incorporated in RR-2008

This is not the text in force. It is the version of this Recommendation that RR-2008 gave treaty-binding force, kept so that the incorporated set can be read as it stood at each conference.

See the edition in force (RR-2024)
M

Recommendation ITU-R M.541-9

Mandatory (1978-1982-1986-1990-1992-1994-1995-1996-1997-2004)

Operational procedures for the use of digital selective-calling equipment in the maritime mobile service

View official text at ITU

Version history

Version evolution

The number in each cell (e.g. −9) is the Recommendation's revision number — the “-9” in ITU-R M.585-9, not a negative value. So −8 → −9 means the binding reference moved from the 8th to the 9th revision.

RR-2008 -9
RR-2012 -9
RR-2016 -10
RR-2020 -10
RR-2024 -11

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Bands and services are derived from the footnotes of the Radio Regulations as they stand, so they are shown only on the edition in force.

Scope

digital selective-calling (DSC) will be used as described in Recommendation ITU-R M.493;

Recommends

  1. that the technical characteristics of equipment used for DSC in the maritime mobile service should be in conformity with the relevant ITU-R Recommendations;
  2. that the operational procedures to be observed in the MF, HF and VHF bands for DSC should be in accordance with Annex 1 for distress and safety calls and Annex 2 for other calls;
  3. that provisions should be made at stations equipped for DSC for:
  4. 3.1 the manual entry of address, type of call, category and various messages into a DSC sequence;
  5. 3.2 the verification and if necessary the correction of such manually formed sequences;
  6. 3.3 a specific aural alarm and visual indication to indicate receipt of a distress or urgency call or a call having distress category. It should not be possible to disable this alarm and indication. Provisions should be made to ensure that they can be reset only manually;

+19 more in the full text

Source: ITU Radio Regulations, editions of 2008, 2012, 2016, 2020 and 2024. The English, French and Spanish texts are each taken from the official edition in that language, not translated from one another. Sources and citation.