IEC 61023:1999

Maritime navigation and radiocommunication equipment and systems - Marine speed and distance measuring equipment (SDME) - Performance requirements - Methods of testing and required test results

Specifies the minimum performance requirements, methods of testing and required test results of devices intended to indicate speed and distance (SDME), as required by the International Convention for the Safety of Life at Sea (SOLAS). Is associated with IEC 60945 and is based upon the requirements of IMO Resolution A.824.

General Information

• Status: Published
• Publication Date: 15-Jul-1999
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: TC 80 - Maritime navigation and radiocommunication equipment and systems
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 27-Jun-2007

Relations

• Revised: IEC 61023:2007 - Maritime navigation and radiocommunication equipment and systems - Marine speed and distance measuring equipment (SDME) - Performance requirements, methods of testing and required test results
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
Second edition
1999-07
Maritime navigation and radiocommunication
equipment and systems –
Marine speed and distance measuring
equipment (SDME) –
Performance requirements –
Methods of testing and required test results
Matériels et systèmes de navigation et
de radiocommunication maritimes –
Instruments de mesure de la vitesse et
de la distance pour navires (Lochs) –
Exigences de fonctionnement –
Méthodes d'essai et résultats d’essai exigés

Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are

available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base

publication incorporating amendments 1 and 2.

Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is to be found at the following IEC sources:
• IEC web site*
•
Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International
Electrotechnical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60617: Graphical symbols
for diagrams.
* See web site address on title page.

INTERNATIONAL IEC
STANDARD
Second edition
1999-07
Maritime navigation and radiocommunication
equipment and systems –
Marine speed and distance measuring
equipment (SDME) –
Performance requirements –
Methods of testing and required test results
Matériels et systèmes de navigation et
de radiocommunication maritimes –
Instruments de mesure de la vitesse et
de la distance pour navires (Lochs) –
Exigences de fonctionnement –
Méthodes d'essai et résultats d’essai exigés

 IEC 1999  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
M
International Electrotechnical Commission
For price, see current catalogue

– 2 – 61023 © IEC:1999(E)
CONTENTS
Page
FOREWORD . 3

Clause
1 Scope . 4

2 Normative references . 4

3 Abbreviations . 4
4 Minimum performance requirements. 5
4.1 Introduction . 5
4.2 Methods of presentation . 5
4.3 Accuracy of measurement. 6
4.4 Roll and pitch . 6
4.5 Construction and installation . 6
5 Methods of testing and required test results. 7
5.1 General . 7
5.2 Test arrangements . 7
5.3 Minimum depth . 7
5.4 General requirements . 7
5.5 SDME configuration . 7
5.6 Optional facilities . 8
5.7 System configuration . 8
5.8 Methods of presentation . 8
5.9 Distance run external output . 8
5.10 Mode selection and indication . 9
5.11 Additional speed indications. 9
5.12 Accuracy of measurement. 9
5.13 Effects of environment . 10
5.14 Roll and pitch . 10
5.15 Construction and installation . 10

Figure 1 – Ship speed velocity vectors.11
Annex A (informative) Cross-references – IMO Resolution A.824 and the tests in this standard . 12

61023 © IEC:1999(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION

EQUIPMENT AND SYSTEMS –
Marine speed and distance measuring equipment (SDME) –

Performance requirements – Methods of testing and required test results

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all
national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this Internatonal Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61023 has been prepared by IEC technical committee 80: Maritime
navigation and radiocommunication equipment and systems.
This second edition cancels and replaces the first edition published in 1990 of which it
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
80/214/FDIS 80/236/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
The committee has decided that this publication remains valid until 2004.
At this date, in accordance with the committee’s decision, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
Annex A is for information only.
A bilingual version of this standard may be issued at a later date.

– 4 – 61023 © IEC:1999(E)
MARITIME NAVIGATION AND RADIOCOMMUNICATION

EQUIPMENT AND SYSTEMS –
Marine speed and distance measuring equipment (SDME) –

Performance requirements – Methods of testing and required test results

1 Scope
This International Standard specifies the minimum performance requirements, methods of

testing and required test results of devices to indicate speed and distance – speed and
distance measuring equipment (SDME) required by Regulation 12 of Chapter V of the
International Convention for the Safety of Life at Sea (SOLAS), 1974, as amended, and which
is associated with IEC 60945.
This standard is based upon the requirements of IMO Resolution A.824. The clause numbering
of that resolution is indicated in parentheses in clause 4 and all sub-clauses whose meaning is
identical to that in the resolution are printed in italics.
In the tests of clause 5, the corresponding requirement of clause 4 is indicated in parentheses.
The cross-references between the IMO performance standards in Resolution A.824 and the
tests of this standard are summarized in annex A.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC 60945:1996, Maritime navigation and radiocommunication equipment and systems –
General requirements – Methods of testing and required test results
IEC 61162-1:1995, Maritime navigation and radiocommunication equipment and systems –
Digital interfaces – Part 1: Single talker and multiple listeners
IMO A.694:1991, General requirements for shipborne radio equipment forming part of the

global maritime distress and safety system (GMDSS) and for electronic navigational aids
IMO A.824:1995, Performance standards for devices to indicate speed and distance
3 Abbreviations
IMO International Maritime Organisation
VBW Dual ground/water speed
VLW Distance travelled through the water

61023 © IEC:1999(E) – 5 –
4 Minimum performance requirements

4.1 Introduction
4.1.1 (A.824/A1.1) Devices to indicate speed and distance are intended for general
navigation and ship manoeuvring use. Although the minimum requirement is to provide
information on the distance run and the forward speed of the ship through the water or over the

ground, additional information on ship’s motions other than in the forward axis may be

provided. The equipment shall comply fully with its performance standard at forward speeds up

to the maximum speed of the ship and in water of depth greater than 3 m beneath the keel.

4.1.2 (A.824/A1.2) In addition to the general requirements in Resolution A.694 as detailed in
IEC 60945, devices to indicate speed and distance shall comply with the minimum performance
requirements of this standard.
4.1.3 Where SDME information is generated by one unit of equipment and is displayed on
another unit, the combination of the two units shall be regarded as forming the SDME and shall
be tested as an entity.
4.1.4 Any facility provided by the equipment which is additional to the minimum requirements
of this standard shall be tested to ensure that its operation (and, as far as is reasonably
practicable, its malfunction) does not degrade the performance of the equipment.
4.1.5 The system shall consist of a sensor and the necessary processing unit to convert the
output signal of the sensor to speed and distance for display and for transmission to other
equipment.
4.2 Methods of presentation
4.2.1 (A.824/A2.1) Speed information may be presented in either analogue or digital form.
Where a digital display is used, its incremental steps shall not exceed 0,1 knots. Analogue
displays shall be graduated at least every 0,5 knots and be marked with figures at least every
5 knots. If the display can present the speed of the ship in other than the forward direction, the
direction of movement shall be indicated unambiguously.
4.2.2 (A.824/A
...