Circular
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Radiocommunication and Search and Rescue - COMSAR/Circ.35 - Recommendations on Medium Frequency/High Frequency (MF/HF) Digital Selective Calling (DSC) Test Calls to Coast Stations (21 May 2004) - Circular

Circular

1 The Maritime Safety Committee, at its seventy-eighth session (12 to 21 May 2004), endorsed the view of the Sub-Committee on Radiocommunications and Search and Rescue (COMSAR), which held its eighth session from 16 to 20 February 2004, that the regular use of DSC equipment as described in COMSAR/Circ.17 should be encouraged. However, the International Telecommunications Union Sector for Radiocommunications had indicated that excessive test calls on DSC distress and safety frequencies were overloading the system to the point where interference to distress and safety calls had become a cause for concern.

2 In view of the above, and as a matter of urgency, Administrations concerned are urged to co-operate in managing and reducing the number of test calls on the MF/HF DSC distress and safety frequencies.

3 To achieve this, live testing on DSC distress and safety frequencies with coast stations should be limited to once a week. A background on the need for DSC test calls is described in COM/Circ.106.

4 Member Governments and international organizations are invited to bring the above to the attention of their national search and rescue (SAR) Authorities, RCCs, shipowners, shipping companies and shipmasters.


Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.