IEC 61097-4:2012

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 61097-4:2012(E) 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).

General Information

• Status: Published
• Publication Date: 26-Jun-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.140.20 - Incandescent lamps
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: TC 80 - Maritime navigation and radiocommunication equipment and systems
• Drafting Committee: WG 8 - TC 80/WG 8

Relations

• Amended By: IEC 61097-4:2012/AMD1:2016 - Amendment 1 - 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
• Effective Date: 05-Sep-2023
• Amended By: IEC 61097-4:2012/AMD2:2019 - Amendment 2 - 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
• Effective Date: 05-Sep-2023
• Revises: IEC 61097-4:2007 - 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
• Effective Date: 05-Sep-2023
• Revised: IEC 61097-4:2024 - 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
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61097-4 ®
Edition 3.0 2012-05
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 your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

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IEC 61097-4 ®
Edition 3.0 2012-05
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
PRICE CODE
U
ICS 47.020.70 ISBN 978-2-83220-108-4

– 2 – 61097-4 © IEC:2012(E)
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Performance requirements . 7
3.1 Overview . 7
3.2 Non-operational requirements . 8
3.2.1 General . 8
3.2.2 Warning of radiation hazard . 8
3.2.3 Power supply changeover . 8
3.3 Operational requirements for ship earth stations . 8
3.3.1 Capabilities . 8
3.3.2 Ship station identity . 8
3.3.3 Distress alerting . 8
3.3.4 Position updating . 9
3.4 Operational requirements for EGC receivers . 9
3.4.1 Capabilities . 9
3.4.2 General . 10
3.4.3 Position and area code updating . 10
3.4.4 Indication of receipt of priority message . 10
3.4.5 Indication of tuning and synchronisation . 10
3.4.6 Printing selection . 11
3.4.7 Printing device . 11
3.5 Performance related requirements from IEC 60945 . 11
3.6 Other requirements . 11
3.7 Long-range identification and tracking . 12
3.7.1 General . 12
3.7.2 Capabilities . 12
3.7.3 Functionality . 13
3.7.4 Communication system . 14
4 Technical characteristics . 14
4.1 Overview . 14
4.2 Environmental and electromagnetic compatibility requirement . 14
4.3 Radiated spurious emissions . 15
5 Methods of testing and required test results . 15
5.1 Overview . 15
5.1.1 General . 15
5.1.2 Performance requirements . 15
5.1.3 Technical characteristics . 16
5.2 Tests of non-operational requirements . 16
5.3 Tests of operational requirements for ship earth stations . 16
5.3.1 Capabilities . 16
5.3.2 Ship station identity . 16
5.3.3 Distress alerting . 16
5.3.4 Position updating . 16
5.4 Tests of operational requirements for EGC receivers . 17

61097-4 © IEC:2012(E) – 3 –
5.4.1 Capabilities . 17
5.4.2 General . 17
5.4.3 Position and area code updating . 17
5.4.4 Indication of receipt of priority message . 17
5.4.5 Indication of tuning and synchronisation . 17
5.4.6 Printing selection . 18
5.4.7 Printing device . 18
5.5 Tests of performance related requirements from IEC 60945 . 18
5.6 Tests of other requirements . 18
5.7 Long-range identification and tracking . 18
5.7.1 General . 18
5.7.2 Capabilities . 18
5.7.3 Functionality . 19
5.7.4 Communication system . 19
5.8 Tests of technical characteristics . 20
5.8.1 Inmarsat tests . 20
5.8.2 Tests for environmental and electromagnetic compatibility . 20
Annex A (normative) Requirements relating to installation . 21
Annex B (normative) Radiated unwanted emissions . 22
Annex C (informative) Inmarsat RTP schedule of tests. 25
Bibliography . 29

Table 1 – Data to be transmitted from the shipborne equipment . 14
Table 2 – Environmental conditions . 15
Table B.1 – Limits of unwanted emissions up to 1 000 MHz . 22
Table B.2 – Limits of unwanted emissions above 1 000 MHz . 23
Table B.3 – Limits of unwanted emission within the operating band with carrier-on . 24
Table C.1 – Phase I Inmarsat-C schedule of tests . 25
Table C.2 – Phase I EGC receiver schedule of tests . 27
Table C.3 – Phase II schedule of tests . 28

– 4 – 61097-4 © IEC:2012(E)
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 and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its techn
...

IEC 61097-4 ®
Edition 3.1 2016-08
CONSOLIDATED 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 Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]

CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

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The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
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Centre: [e-mail].
IEC 61097-4 ®
Edition 3.1 2016-08
CONSOLIDATED 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 978-2-8322-3605-5

IEC 61097-4 ®
Edition 3.1 2016-08
CONSOLIDATED VERSION
REDLINE VERSION
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
– 2 – IEC 61097-4:2012+AMD1:2016 CSV

© IEC 2016
CONTENTS
FOREWORD. 4

1 Scope . 6

2 Normative references . 6

3 Performance requirements . 7

3.1 Overview . 7

3.2 Non-operational requirements . 8

3.2.1 General . 8

3.2.2 Warning of radiation hazard . 8
3.2.3 Power supply changeover . 8
3.3 Operational requirements for ship earth stations . 8
3.3.1 Capabilities . 8
3.3.2 Ship station identity . 8
3.3.3 Distress alerting . 8
3.3.4 Position updating . 9
3.4 Operational requirements for EGC receivers . 9
3.4.1 Capabilities . 9
3.4.2 General . 10
3.4.3 Position and area code updating . 10
3.4.4 Indication of receipt of priority message . 10
3.4.5 Indication of tuning and synchronisation . 10
3.4.6 Printing selection . 11
3.4.7 Printing device . 11
3.5 Performance related requirements from IEC 60945 . 11
3.6 Other requirements . 11
3.7 Long-range identification and tracking . 12
3.7.1 General . 12
3.7.2 Capabilities . 12
3.7.3 Functionality . 13
3.7.4 Communication system . 14
4 Technical characteristics . 14
4.1 Overview . 14
4.2 Environmental and electromagnetic compatibility requirement . 14

4.3 Radiated spurious emissions . 15
4.4 Interfaces . 15
5 Methods of testing and required test results . 15
5.1 Overview . 15
5.1.1 General . 15
5.1.2 Performance requirements . 16
5.1.3 Technical characteristics . 16
5.2 Tests of non-operational requirements . 16
5.3 Tests of operational requirements for ship earth stations . 16
5.3.1 Capabilities . 16
5.3.2 Ship station identity . 16
5.3.3 Distress alerting . 16
5.3.4 Position updating . 17
5.4 Tests of operational requirements for EGC receivers . 17

© IEC 2016
5.4.1 Capabilities . 17

5.4.2 General . 17

5.4.3 Position and area code updating . 17

5.4.4 Indication of receipt of priority message . 17

5.4.5 Indication of tuning and synchronisation . 18

5.4.6 Printing selection . 18

5.4.7 Printing device . 18

5.5 Tests of performance related requirements from IEC 60945 . 18

5.6 Tests of other requirements . 18

5.7 Long-range identification and tracking . 18

5.7.1 General . 18
5.7.2 Capabilities . 18
5.7.3 Functionality . 19
5.7.4 Communication system . 19
5.8 Tests of technical characteristics . 20
5.8.1 Inmarsat tests . 20
5.8.2 Tests for environmental and electromagnetic compatibility . 20
5.8.3 Interfaces . 20
Annex A (normative) Requirements relating to installation . 21
Annex B (normative) Radiated unwanted emissions . 22
Annex C (informative) Inmarsat RTP schedule of tests. 25
Bibliography . 29

Table 1 – Data to be transmitted from the shipborne equipment . 14
Table 2 – Environmental conditions . 15
Table B.1 – Limits of unwanted emissions up to 1 000 MHz . 22
Table B.2 – Limits of unwanted emissions above 1 000 MHz . 23
Table B.3 – Limits of unwanted emission within the operating band with carrier-on . 24
Table C.1 – Phase I Inmarsat-C schedule of tests . 25
Table C.2 – Phase I EGC receiver schedule of tests . 27
Table C.3 – Phase II schedule of tests . 28

– 4 – IEC 61097-4:2012+AMD1:2016 CSV

© IEC 2016
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 and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements
...

IEC 61097-4 ®
Edition 3.2 2019-06
CONSOLIDATED 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 Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
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 Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
IEC 61097-4 ®
Edition 3.2 2019-06
CONSOLIDATED 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 978-2-8322-7116-2

IEC 61097-4 ®
Edition 3.2 2019-06
CONSOLIDATED VERSION
REDLINE VERSION
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
– 2 – IEC 61097-4:2012+AMD1:2016

+AMD2:2019 CSV © IEC 2019
CONTENTS
FOREWORD . 4

INTRODUCTION to Amendment 2 . 6

1 Scope . 7

2 Normative references . 7

3 Performance requirements . 9

3.1 Overview . 9

3.2 Non-operational requirements . 9
3.2.1 General . 9
3.2.2 Warning of radiation hazard . 9
3.2.3 Power supply changeover . 9
3.3 Operational requirements for ship earth stations . 9
3.3.1 Capabilities . 9
3.3.2 Ship station identity . 10
3.3.3 Distress alerting . 10
3.3.4 Position updating . 10
3.4 Operational requirements for EGC receivers . 11
3.4.1 Capabilities . 11
3.4.2 General . 11
3.4.3 Position and area code updating . 11
3.4.4 Indication of receipt of priority message . 12
3.4.5 Indication of tuning and synchronisation . 12
3.4.6 Printing selection . 12
3.4.7 Printing device . 12
3.5 Performance related requirements from IEC 60945 . 13
3.6 Other requirements . 13
3.7 Long-range identification and tracking . 13
3.7.1 General . 13
3.7.2 Capabilities . 14
3.7.3 Functionality . 15
3.7.4 Communication system . 15
4 Technical characteristics . 16
4.1 Overview . 16

4.2 Environmental and electromagnetic compatibility requirement . 16
4.3 Radiated spurious emissions . 17
4.4 Interfaces . 17
5 Methods of testing and required test results . 17
5.1 Overview . 17
5.1.1 General . 17
5.1.2 Performance requirements . 18
5.1.3 Technical characteristics . 18
5.2 Tests of non-operational requirements . 18
5.3 Tests of operational requirements for ship earth stations . 18
5.3.1 Capabilities . 18
5.3.2 Ship station identity . 18
5.3.3 Distress alerting . 18
5.3.4 Position updating . 19

+AMD2:2019 CSV © IEC 2019
5.4 Tests of operational requirements for EGC receivers . 19

5.4.1 Capabilities . 19

5.4.2 General . 19

5.4.3 Position and area code updating . 19

5.4.4 Indication of receipt of priority message . 20

5.4.5 Indication of tuning and synchronisation . 20

5.4.6 Printing selection . 20

5.4.7 Printing device . 20

5.5 Tests of performance related requirements from IEC 60945 . 20

5.6 Tests of other requirements . 20

5.7 Long-range identification and tracking . 20
5.7.1 General . 20
5.7.2 Capabilities . 21
5.7.3 Functionality . 21
5.7.4 Communication system . 21
5.8 Tests of technical characteristics . 22
5.8.1 Inmarsat tests . 22
5.8.2 Tests for environmental and electromagnetic compatibility . 22
5.8.3 Interfaces . 22
Annex A (normative) Requirements relating to installation . 24
Annex B (normative) Radiated unwanted emissions . 25
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 61097-4:2012+AMD1:2016

+AMD2:2019 CSV © IEC 2019
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 and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC
...