IEC 61097-4:2024
(Main)Global maritime distress and safety system (GMDSS) - Part 4: Inmarsat-C ship earth station and Inmarsat enhanced group call (EGC) equipment - Operational and performance requirements, methods of testing and required test results
Global maritime distress and safety system (GMDSS) - Part 4: Inmarsat-C ship earth station and Inmarsat enhanced group call (EGC) equipment - Operational and performance requirements, methods of testing and required test results
IEC 61097-4:2024 specifies the performance requirements and methods of testing for Inmarsat-C ship earth stations (SES) capable of transmitting and receiving direct-printing communications, and for enhanced group call (EGC) receivers, for use in the GMDSS and for use for long-range identification and tracking (LRIT). The available variants are:
Class 0: An EGC receiver, either stand-alone or an element of a GMDSS installation in accordance with the Inmarsat design and installation guidelines (DIGs) for GMDSS installations.
Class 1: A basic SES providing shore-to-ship and ship-to-shore message transfer only.
Class 2: As class 1 but with EGC as an alternative to shore-to-ship transfer using a shared receiver.
Class 3: As class 1 but with EGC using an independent receiver.
NOTE 1 The 34th session of the IMO Sub-Committee on Radiocommunications decided that class 2 equipment would be adequate to provide sufficient availability for the reception of maritime safety information for the GMDSS.
This document complies with IMO performance requirements stated in the normative references, Inmarsat technical characteristics and test procedures, and IEC 60945 general requirements except where modifications are explicitly stated in this document. Technical characteristics essential to GMDSS and LRIT operation as defined by the IMO are identified.
All text of this document, whose wording is identical to that in IMO SOLAS Convention 1974 as amended in 1988 and Resolutions MSC.513(105), MSC.263(84) and MSC.306(87) is printed in italics and reference made to the Resolution/Recommendation and subclause number.
This document covers equipment construction and testing. Matters relating to installation can be found in the Inmarsat Maritime design and installation guidelines (see Bibliography). Those to be found in IMO Resolutions MSC.513(105), MSC.263(84) and MSC.306(87) are reproduced in Annex A.
Responsibility for type approval of Inmarsat-C and Inmarsat-EGC is vested in Inmarsat by IMO Resolutions MSC.513(105) and MSC.306(87) (see 4.2.1). Therefore, this document does not reproduce Inmarsat test procedures in full but refers to where they are given in Inmarsat documentation cited in the normative references to this document (Annex C).
NOTE 2 For the purposes of this document the terms Inmarsat C, Inmarsat-C, Inmarsat Standard-C, Standard-C refer to the same equipment.
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IEC 61097-4 ®
Edition 4.0 2024-02
INTERNATIONAL
STANDARD
Global maritime distress and safety system (GMDSS) –
Part 4: Inmarsat-C ship earth station and Inmarsat enhanced group call (EGC)
equipment – Operational and performance requirements, methods of testing and
required test results
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
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International Standards for all electrical, electronic and related technologies.
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IEC 61097-4 ®
Edition 4.0 2024-02
INTERNATIONAL
STANDARD
Global maritime distress and safety system (GMDSS) –
Part 4: Inmarsat-C ship earth station and Inmarsat enhanced group call (EGC)
equipment – Operational and performance requirements, methods of testing
and required test results
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.70 ISBN 978-2-8322-8299-1
– 2 – IEC 61097-4:2024 © IEC 2024
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 Performance requirements. 8
4.1 Overview. 8
4.2 Non-operational requirements . 8
4.2.1 General . 8
4.2.2 Warning of radiation hazard . 8
4.2.3 Power supply changeover . 9
4.2.4 Installation . 9
4.3 Operational requirements for ship earth stations . 9
4.3.1 Capabilities. 9
4.3.2 Ship station identity . 9
4.3.3 Distress alerting . 9
4.3.4 Position updating . 10
4.4 Operational requirements for EGC receivers . 10
4.4.1 Capabilities. 10
4.4.2 General . 11
4.4.3 Position and area code updating . 11
4.4.4 Indication of receipt of priority message . 11
4.4.5 Indication of tuning and synchronisation . 12
4.4.6 Printing selection . 12
4.4.7 Printing device . 12
4.5 Performance related requirements from IEC 60945 . 12
4.6 Other requirements . 13
4.7 Long-range identification and tracking . 13
4.7.1 General . 13
4.7.2 Capabilities. 13
4.7.3 Functionality . 15
4.7.4 Communication system . 15
5 Technical characteristics . 15
5.1 Overview. 15
5.2 Environmental and electromagnetic compatibility requirement . 15
5.3 Radiated spurious emissions . 16
5.4 Interfaces . 16
5.5 Interfering signals . 17
6 Methods of testing and required test results . 17
6.1 Overview. 17
6.1.1 General . 17
6.1.2 Performance requirements . 18
6.1.3 Technical characteristics . 18
6.2 Tests of non-operational requirements . 18
6.3 Tests of operational requirements for ship earth stations . 18
6.3.1 Capabilities. 18
6.3.2 Ship station identity . 18
6.3.3 Distress alerting . 18
6.3.4 Position updating . 19
6.4 Tests of operational requirements for EGC receivers . 19
6.4.1 Capabilities. 19
6.4.2 General . 19
6.4.3 Position and area code updating . 19
6.4.4 Indication of receipt of priority message . 20
6.4.5 Indication of tuning and synchronisation . 20
6.4.6 Printing selection . 20
6.4.7 Printing device . 20
6.5 Tests of performance related requirements from IEC 60945 . 20
6.6 Tests of other requirements . 20
6.7 Long-range identification and tracking . 21
6.7.1 General . 21
6.7.2 Capabilities. 21
6.7.3 Functionality . 21
6.7.4 Communication system . 21
6.8 Tests of technical characteristics . 22
6.8.1 Inmarsat tests . 22
6.8.2 Tests for environmental and electromagnetic compatibility . 22
6.8.3 Interfaces . 23
6.8.4 Interfering signals . 23
Annex A (normative) Requirements relating to installation . 24
A.1 General . 24
A.2 Source of electrical energy . 24
A.3 Siting of antennas . 24
A.4 Long-range identification and tracking . 24
A.5 Requirements . 24
Annex B (normative) Radiated unwanted emissions . 25
B.1 Unwanted emissions 30 MHz to 1 000 MHz . 25
B.2 Unwanted emissions above 1 000 MHz . 25
B.3 Unwanted emissions within the bands with carrier-on . 26
B.4 Unwanted emissions within the bands with carrier-off . 27
Annex C (informative) Inmarsat RTP schedule of tests . 28
Bibliography . 32
Table 1 – Data to be transmitted from the shipborne equipment . 15
Table 2 – Environmental conditions . 16
Table B.1 – Limits of unwanted emissions up to 1 000 MHz . 25
Table B.2 – Limits of unwanted emissions above 1 000 MHz . 26
Table B.3 – Limits of unwanted emission within the operating band with carrier-on . 27
Table C.1 – Phase I Inmarsat-C schedule of tests . 28
Table C.2 – Phase I EGC receiver schedule of tests . 30
Table C.3 – Phase II schedule of tests . 31
– 4 – IEC 61097-4:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GLOBAL MARITIME DISTRESS AND SAFETY SYSTEM (GMDSS) –
Part 4: Inmarsat-C ship earth station and
Inmarsat enhanced group call (EGC) equipment –
Operational and performance requirements,
methods of testing and required test results
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical
...
IEC 61097-4 ®
Edition 4.0 2024-02
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Global maritime distress and safety system (GMDSS) –
Part 4: Inmarsat-C ship earth station and Inmarsat enhanced group call (EGC)
equipment – Operational and performance requirements, methods of testing and
required test results
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a
Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.
IEC Just Published - webstore.iec.ch/justpublished
Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.
Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 61097-4 ®
Edition 4.0 2024-02
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Global maritime distress and safety system (GMDSS) –
Part 4: Inmarsat-C ship earth station and Inmarsat enhanced group call (EGC)
equipment – Operational and performance requirements, methods of testing
and required test results
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.70 ISBN 978-2-8322-8342-4
– 2 – IEC 61097-4:2024 CMV © IEC 2024
CONTENTS
FOREWORD .4
INTRODUCTION to Amendment 2 .
1 Scope .7
2 Normative references .8
3 Terms and definitions .9
4 Performance requirements .9
4.1 Overview .9
4.2 Non-operational requirements .9
4.2.1 General .9
4.2.2 Warning of radiation hazard . 10
4.2.3 Power supply changeover . 10
4.2.4 Installation . 10
4.3 Operational requirements for ship earth stations . 10
4.3.1 Capabilities . 10
4.3.2 Ship station identity . 10
4.3.3 Distress alerting . 10
4.3.4 Position updating . 11
4.4 Operational requirements for EGC receivers . 12
4.4.1 Capabilities . 12
4.4.2 General . 12
4.4.3 Position and area code updating . 13
4.4.4 Indication of receipt of priority message . 13
4.4.5 Indication of tuning and synchronisation . 13
4.4.6 Printing selection . 13
4.4.7 Printing device . 14
4.5 Performance related requirements from IEC 60945 . 14
4.6 Other requirements . 14
4.7 Long-range identification and tracking . 15
4.7.1 General . 15
4.7.2 Capabilities . 15
4.7.3 Functionality . 16
4.7.4 Communication system . 17
5 Technical characteristics . 17
5.1 Overview . 17
5.2 Environmental and electromagnetic compatibility requirement . 17
5.3 Radiated spurious emissions . 18
5.4 Interfaces . 18
5.5 Interfering signals . 19
6 Methods of testing and required test results . 19
6.1 Overview . 19
6.1.1 General . 19
6.1.2 Performance requirements . 19
6.1.3 Technical characteristics . 19
6.2 Tests of non-operational requirements . 19
6.3 Tests of operational requirements for ship earth stations . 19
6.3.1 Capabilities . 19
6.3.2 Ship station identity . 20
6.3.3 Distress alerting . 20
6.3.4 Position updating . 20
6.4 Tests of operational requirements for EGC receivers . 21
6.4.1 Capabilities . 21
6.4.2 General . 21
6.4.3 Position and area code updating . 21
6.4.4 Indication of receipt of priority message . 21
6.4.5 Indication of tuning and synchronisation . 21
6.4.6 Printing selection . 21
6.4.7 Printing device . 22
6.5 Tests of performance related requirements from IEC 60945 . 22
6.6 Tests of other requirements . 22
6.7 Long-range identification and tracking . 22
6.7.1 General . 22
6.7.2 Capabilities . 22
6.7.3 Functionality . 23
6.7.4 Communication system . 23
6.8 Tests of technical characteristics. 24
6.8.1 Inmarsat tests . 24
6.8.2 Tests for environmental and electromagnetic compatibility . 24
6.8.3 Interfaces . 24
6.8.4 Interfering signals . 24
Annex A (normative) Requirements relating to installation . 26
A.1 General . 26
A.2 Source of electrical energy. 26
A.3 Siting of antennas . 26
A.4 Long-range identification and tracking . 26
A.5 Requirements . 26
Annex B (normative) Radiated unwanted emissions. 27
B.1 Unwanted emissions 30 MHz to 1 000 MHz . 27
B.2 Unwanted emissions above 1 000 MHz . 27
B.3 Unwanted emissions within the bands with carrier-on . 28
B.4 Unwanted emissions within the bands with carrier-off . 29
Annex C (informative) Inmarsat RTP schedule of tests . 30
Bibliography . 34
List of comments . 35
Table 1 – Data to be transmitted from the shipborne equipment . 16
Table 2 – Environmental conditions . 17
Table B.1 – Limits of unwanted emissions up to 1 000 MHz . 27
Table B.2 – Limits of unwanted emissions above 1 000 MHz . 28
Table B.3 – Limits of unwanted emission within the operating band with carrier-on . 29
Table C.1 – Phase I Inmarsat-C schedule of tests . 30
Table C.2 – Phase I EGC receiver schedule of tests . 32
Table C.3 – Phase II schedule of tests . 33
– 4 – IEC 61097-4:2024 CMV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GLOBAL MARITIME DISTRESS AND SAFETY SYSTEM (GMDSS) –
Part 4: Inmarsat-C ship earth station and
Inmarsat enhanced group call (EGC) equipment –
Operational and performance requirements,
methods of testing and required test results
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical a
...
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