• Ground Segment Changes CSC-73- MEOLUTs

  • SUBMISSION DEADLINE:  1 April 2026

  • At CSC-73, the Council decided to approve the list of new changes to ground segment equipment (GSE) and associated implementation dates agreed at JC-39, as shown at Annex 26 to the JC-39 Report, as amended at CSC-73/OPN/SR/Annex 10. The Council invited Ground Segment Providers to report their status of implementation of approved changes to GSE using the survey tool provided by the Secretariat, with a submission deadline of 1 April 2026, to enable consideration at JC-40.

  • A PDF version of this list (for reference purposes only) can be found here:  https://www.cospas-sarsat.int/images/cospas_sarsat/pdf_uploads/2025-06-GSE_changes_complete_list_approved_at_CSC-73.pdf

    Responses are required for all items listed.  Available responses are:

    • Compliant
    • Planned Compliance
    • Non-compliant

    Example explanatory note:

    • system not yet commissioned
    • equipment scheduled to be installed/commissioned in [2027] 

    Note: If there are any questions, concerns, or problems completing this form please contact mail@cospas-sarsat.int

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  •  
    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-001 Changes in the RLS protocol (per C/S T.001, section A3.3.7
    and Figure A.10, no fixed bits starting in bit 107)    		 Critical Adaptive Jun-17 JC-30 Report, sections 5.1.32 to 5.1.37  C/S T.001 - Issue 4 (CSC-57) section A3.3.7 and Figure A.10
  • MEOLUT-1*
  • MEOLUT-1 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-002 Handle new ELT(DT) Location Protocol and Figure A.10, no fixed bits starting in bit 107) Routine Enhancement Dec-18 JC-30 Report, sections 5.1.32 to 5.1.37 C/S T.001 - Issue 4 (CSC-57) sections 2.2.1, 3.3, 4.5.5.6 and A3.3.8, and Figure A.11

     

  • MEOLUT-2*
  • MEOLUT-2 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-003 MEOLUT-MCC standard interface format Routine Enhancement Dec-18 JC-31 Report, section 4.6.24 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 3.2

    Comment:  should be implemented in MEOLUTs for which commissioning reports would be reviewed at JC-32, but
    would not be required until April 2020 for:
    - already-commissioned MEOLUTs,
    - MEOLUTs that would be formally commissioned as of CSC-59 (February 2018),
    - MEOLUTs for which the Ground Segment Provider notified the Secretariat by March 2018 that it planned to commission its MEOLUT prior to April 2020 without meeting this requirement.

  • MEOLUT-3*
  • MEOLUT-3 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-004 Processing of QMS beacons in self-test mode Routine Enhancement Jun-19 JC-31 Report, section 4.4 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 4.2.2

    Comment:  needed for MEOSAR IOC

  • MEOLUT-4*
  • MEOLUT-4 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-005 C/S T.001 Message Validation Routine Adaptive Dec-18 JC-31 Report, section 4.4 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 4.2.4.1
  • MEOLUT-5*
  • MEOLUT-5 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-006 Multiple Invalid C/S T.001 Beacon Message Processing Routine Adaptive Dec-18 JC-31 Report, section 4.4 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 4.2.5
  • MEOLUT-6*
  • MEOLUT-6 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-007 Transmitting Data to the MCC Routine Adaptive Dec-18 JC-31 Report, section 4.4 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 4.2.10
  • MEOLUT-7*
  • MEOLUT-7 Planned Compliance Date
     - -
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    Reference

    		 Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-008 Slow-moving beacon location accuracy Critical Enhancement Jun-19 JC-31 Report, section 4.4 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 5.6

    Comment:  needed for MEOSAR IOC

  • MEOLUT-8*
  • MEOLUT-8 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-009 Detection, location and processing of C/S T.018 beacons Critical Enhancement Dec-18 JC-31 Report, section 4.4 C/S T.019 - Issue 2 Rev. 1 (CSC-59) (too numerous to list)

    Comment:  MEOSAR IOC declaration is not contingent upon this

  • MEOLUT-9*
  • MEOLUT-9 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-010 MEOLUTs to provide data for ELT(DT) incident alert data Critical Enhancement Dec-18 JC-31 Report, section 7.2.16 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 3.2
  • MEOLUT-10*
  • MEOLUT-10 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-011 MEOLUTs to provide data for SGB incident alert data Critical Enhancement Dec-18 JC-31 Report, section 7.2.16 C/S T.019 - Issue 2 Rev. 1 (CSC-59) sections 3.2 and 4.2.1

    Comment:  MEOSAR IOC declaration is not contingent upon this

  • MEOLUT-11*
  • MEOLUT-11 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-012 Filter data from satellites experiencing an abnormal status Routine Adaptive Dec-18 JC-31 Report, annex 25 C/S T.019 - Issue 2 Rev. 1 (CSC-59) section 4.2.9

     

  • MEOLUT-12*
  • MEOLUT-12 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-013 Multiple Invalid Beacon Message Processing Critical Enhancement Jun-19 JC-32 Report, annex 18   section 4.2.5

     

  • MEOLUT-13*
  • MEOLUT-13 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-014 C/S T.018 Message Association Critical Enhancement Jun-19   JC-32 Report, Annex 18 section 4.2.6.2

     

  • MEOLUT-14*
  • MEOLUT-14 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-015 Multiple Valid C/S T.001 Message Processing Critical Enhancement Jun-19 JC-32 Report, Annex 18   section 4.2.7

     

  • MEOLUT-15*
  • MEOLUT-15 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-016 Transmitting Data to the MCC Critical Enhancement Jun-19 JC-32 Report, Annex 18   section 4.2.11

     

  • MEOLUT-16*
  • MEOLUT-16 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-017 Slow Moving Beacon location accuracy Critical Enhancement Jun-19 JC-32 Report, Annexes 18 & 19   T.019, section 5.6

     

  • MEOLUT-17*
  • MEOLUT-17 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-018 EHE processing Critical Enhancement Jun-19 JC-32 Report, Annexes 18 & 19   T.019, section 5.10

     

  • MEOLUT-18*
  • MEOLUT-18 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-019 Computation of Frequency Offset used in TOA/FOA Data Exchange Routine Enhancement Jan-21 JC-32 Report, Annex 5   A.002 section Annex B Appendix B.1 MF 70

     

  • MEOLUT-19*
  • MEOLUT-19 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-020
    (Change No Longer Required)    		 MEOLUT use of the 23 Hex Id
    per updated definition in T.018
    Table 3.10    		 Critical Adaptive Jan-22 (OBE) EWG-2-
    2020
    Annex 11    		   T.018 Table 3.10,
    footnote 3

    Comment:  Bits 118 to 137 of the Vessel ID are considered to be all “0’s in the SGB 23 Hex Id for the 24 bit address coding option. See T.019 section 4.2.6.2. OBE per EWG-1/2021 modification. 

  • MEOLUT-020*
  • MEOLUT-020 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-021 Processing of QMS beacons in self-test mode for SGBs Routine Enhancement Jun-23  JC-35 Report, Annex T.019   T.019: Issue 2 Rev.6 (CSC-66), section 4.2.2 “Beacon Message Recovery”
  • MEOLUT-021*
  • MEOLUT-021 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-022 Default value for number of Networked Antennas above 98 Critical Coorrective Mar-23    CSC-66/OPN A.002: Appendix B.1 - MF #80 - Networked Antennas
  • MEOLUT-022*
  • MEOLUT-022 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-023 Invalidation of single-burst single-antenna messages with five or more BCH corrected bit errors. Routine Adaptive Nov-24  JC-36 Report, Annex 17 (T.019) T.019: section 4.2.4.2 None
  • MEOLUT-023*
  • MEOLUT-023 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-024 Removal of the waiver for ELT(DT) DOA position Critical Adaptive Oct-25 Removal of the waiver for ELT(DT) DOA position JC-38 Annex (21) (T.020) C/S T.020: Table A-2 “MEOLUT Commissioning Summary Data Table (C/S T.001 Beacon Part), Page A-5. Footnote
  • MEOLUT-024*
  • MEOLUT-024 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-025 Change in the matching bits for Multiple Invalid C/S T.018 Beacon Message Processing Routine Adaptive Oct-25 Match of bits 1 to 202 of SGB messages (instead of bits 1 to 252) JC-38 Annex (20) (T.019) C/S T.019, section 4.2.5.2 “Multiple Invalid C/S T.018 Beacon Message Processing”
  • MEOLUT-025*
  • MEOLUT-025 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-026 Capacity to process at least 4 SGB bursts in normal mode overlapping in time Routine Adaptive Oct-26 Capacity to process at least 4 SGB bursts in normal mode overlapping in time JC-38 Report, section 5.3.42 (a) C/S T.019, section 4.2.2 “Beacon Message Recovery”. See also C/S T.019, section 5.3.2 and C/S T.020, section C.3.1.
  • MEOLUT-026*
  • MEOLUT-026 Planned Compliance Date
     - -
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    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    MEOLUT-027 5-minute time window for validation of SGB messages with 5 or 6 corrected bit errors Routine Enhancement Oct-27 JC-39 Annex XX (T.019), section x.x.x T.019: section 4.2.4.2 T.019: section 4.2.4.2 "C/S T.018 Message Validation"
  • MEOLUT-027*
  • MEOLUT-027 Planned Compliance Date
     - -

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