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

Reference	Brief Description	Criticality	Type	Implementation Due Date	Joint Committee References	Red Book Reference (Council Session)	Document Section(s)/Page(s)
GEOLUT-1	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

Reference	Brief Description	Criticality	Type	Implementation Due Date	Joint Committee References	Red Book Reference (Council Session)	Document Section(s)/Page(s)
GEOLUT-2	Handle new ELT(DT) Location Protocol	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

 

Reference	Brief Description	Criticality	Type	Implementation Due Date	Joint Committee References	Red Book Reference (Council Session)	Document Section(s)/Page(s)
GEOLUT-3	Provide data for ELT(DT) incident alert data	Critical	Enhancement	Dec-18	JC-31 Report, section 4.4 and 7.2.16	C/S T.009 - Issue 2 (CSC-59)	sections 3.8, 4.2.5, 4.2.6 and 5.1

 

Reference	Brief Description	Criticality	Type	Implementation Due Date	Joint Committee References	Red Book Reference (Council Session)	Document Section(s)/Page(s)
GEOLUT-4	Provide data for SGB incident alert data	Critical	Enhancement	Dec-18	JC-31 Report, section 4.4 and 7.2.16	C/S T.009 - Issue 2 (CSC-59)	sections 3.2 and 4.2.2.2

 

Reference	Brief Description	Criticality	Type	Implementation Due Date	Joint Committee References	Red Book Reference (Council Session)	Document Section(s)/Page(s)
GEOLUT-5	Beacon Message Processing for ELT(DT)s	Critical	Enhancement	Jun-19	JC-32 Report, Annex 15		section 5.1.1.2

 

Reference	Brief Description	Criticality	Type	Implementation Due Date	Joint Committee References	Red Book Reference (Council Session)	Document Section(s)/Page(s)
GEOLUT-6	Processing frequency	Critical	Corrective	Jun-20	JC-33 Report Annex [T.009]		section 5.6

 

Reference	Brief Description	Criticality	Type	Implementation Due Date	Joint Committee References	Red Book Reference (Council Session)	Document Section(s)/Page(s)
GEOLUT-7 (Change No Longer Required)	GEOLUT 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.009 section 4.2.5.4. OBE per EWG-1/2021 modification. 

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