EN IEC 61924-2:2021

SLOVENSKI STANDARD
01-junij-2021
Nadomešča:
SIST EN 61924-2:2013
Pomorska navigacijska in radiokomunikacijska oprema in sistemi - Integrirani
navigacijski sistemi (INS) - 2. del: Modularna struktura za INS - Zahteve za
delovanje in lastnosti, preskusne metode in zahtevani rezultati preskušanja (IEC
61924-2:2021)
Maritime navigation and radiocommunication equipment and systems - Integrated
navigation systems (INS) - Part 2: Modular structure for INS - Operational and
performance requirements, methods of testing and required test results (IEC 61924-
2:2021)
Navigations- und Funkkommunikationsgeräte und -systeme für die Seeschifffahrt -
Integrierte Navigationssysteme - Teil 2: Modulare Struktur für INS - Betriebs- und
Leistungsanforderungen, Prüfverfahren und geforderte Prüfergebnisse (IEC 61924-
2:2021)
Matériels et systèmes de navigation et de radiocommunication maritimes - Systèmes de
navigation intégrés - Partie 2: Structure modulaire des systèmes de navigation intégrés -
Exigences opérationnelles et de fonctionnement, méthodes d'essai et résultats d'essai
exigés (IEC 61924-2:2021)
Ta slovenski standard je istoveten z: EN IEC 61924-2:2021
ICS:
47.020.70 Navigacijska in krmilna Navigation and control
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61924-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2021
ICS 47.020.70 Supersedes EN 61924-2:2013 and all of its amendments
and corrigenda (if any)
English Version
Maritime navigation and radiocommunication equipment and
systems - Integrated navigation systems (INS) - Part 2: Modular
structure for INS - Operational and performance requirements,
methods of testing and required test results
(IEC 61924-2:2021)
Matériels et systèmes de navigation et de Navigations- und Funkkommunikationsgeräte und -systeme
radiocommunication maritimes - Systèmes de navigation für die Seeschifffahrt - Integrierte Navigationssysteme (INS)
intégrés (INS) - Partie 2: Structure modulaire des systèmes - Teil 2: Modulare Struktur für INS - Betriebs- und
de navigation intégrés - Exigences opérationnelles et de Leistungsanforderungen, Prüfverfahren und geforderte
fonctionnement, méthodes d'essai et résultats d'essai Prüfergebnisse
exigés (IEC 61924-2:2021)
(IEC 61924-2:2021)
This European Standard was approved by CENELEC on 2021-03-19. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61924-2:2021 E

European foreword
The text of document 80/977/FDIS, future edition 2 of IEC 61924-2, prepared by IEC/TC 80 "Maritime
navigation and radiocommunication equipment and systems" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 61924-2:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-12-19
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-03-19
document have to be withdrawn
This document supersedes EN 61924-2:2013 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61924-2:2021 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60812 NOTE Harmonized as EN IEC 60812
IEC 61108-5 NOTE Harmonized as EN IEC 61108-5
IEC 61993-2 NOTE Harmonized as EN IEC 61993-2
IEC 62923-2 NOTE Harmonized as EN IEC 62923-2
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60945 2002 Maritime navigation and EN 60945 2002
radiocommunication equipment and
systems - General requirements -
Methods of testing and required test
results
IEC 61162-1 2016 Maritime navigation and EN 61162-1 2016
radiocommunication equipment and
systems - Digital interfaces - Part 1:
Single talker and multiple listeners
IEC 61162-2 - Maritime navigation and EN 61162-2 -
radiocommunication equipment and
systems - Digital interfaces - Part 2:
Single talker and multiple listeners, high-
speed transmission
IEC 61162-450 - Maritime navigation and EN IEC 61162-450 -
radiocommunication equipment and
systems - Digital interfaces - Part 450:
Multiple talkers and multiple listeners -
Ethernet interconnection
IEC 61174 2015 Maritime navigation and EN 61174 2015
radiocommunication equipment and
systems - Electronic chart display and
information system (ECDIS) - Operational
and performance requirements, methods
of testing and required test results
IEC 62065 2014 Maritime navigation and EN 62065 2014
radiocommunication equipment and
systems - Track control systems -
Operational and performance
requirements, methods of testing and
required test results
Publication Year Title EN/HD Year
IEC 62288 - Maritime navigation and EN IEC 62288 -
radiocommunication equipment and
systems - Presentation of navigation-
related information on shipborne
navigational displays - General
requirements, methods of testing and
required test results
IEC 62388 2013 Maritime navigation and EN 62388 2013
radiocommunication equipment and
systems - Shipborne radar - Performance
requirements, methods of testing and
required test results
IEC 62616 - Maritime navigation and EN 62616 -
radiocommunication equipment and
systems - Bridge navigational watch
alarm system (BNWAS)
IEC 62923-1 2018 Maritime navigation and EN IEC 62923-1 2018
radiocommunication equipment and
systems - Bridge alert management -
Part 1: Operational and performance
requirements, methods of testing and
required test results
ISO 11674 - Ships and marine technology - Heading - -
control systems
IMO A.694(17) - General requirements for shipborne radio - -
equipment forming part of the global
maritime distress and safety system
(GMDSS) and for electronic navigational
aids
IMO/ICAO - International Aeronautical and Maritime - -
Search and Rescue Manual (IAMSAR
Manual) Volume 3
IMO MSC/Circ. 982 - Guidelines on ergonomic criteria for - -
bridge equipment and layout
IMO MSC.191(79) - Performance standards for the - -
presentation of navigation-related
information on shipborne navigational
displays
IMO MSC.232(82) - Adoption of the revised performance - -
standards for electronic chart display and
information systems (ECDIS)
IMO MSC.252(83) - Performance Standards for Integrated - -
Navigation Systems (INS)
IMO MSC.452(99) - Amendments to the revised performance - -
standards for integrated navigation
systems (INS) (Resolution MSC.252(83))

IEC 61924-2 ®
Edition 2.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Maritime navigation and radiocommunication equipment and systems –

Integrated navigation systems (INS) –

Part 2: Modular structure for INS – Operational and performance requirements,

methods of testing and required test results

Matériels et systèmes de navigation et de radiocommunication maritimes –

Systèmes de navigation intégrés (INS) –

Partie 2: Structure modulaire des systèmes de navigation intégrés – Exigences

opérationnelles et de fonctionnement, méthodes d'essai et résultats d'essai

exigés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 47.020.70 ISBN 978-2-8322-9304-1

– 2 – IEC 61924-2:2021 © IEC 2021
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 18
4 IMO resolutions . 18
4.1 General . 18
4.2 Purpose of integrated navigation systems . 19
4.3 Application . 20
5 Test requirements and results . 22
5.1 General . 22
5.2 Exceptions for tests previously performed . 22
5.3 Test site . 23
5.4 Methods of test . 23
6 Module A – Requirements for integration of navigational information . 23
6.1 Interfacing and data exchange . 23
6.1.1 Combination, processing and evaluation of data . 23
6.1.2 Availability, validity and integrity . 23
6.1.3 Failure of data exchange . 24
6.1.4 Interfaces in general . 24
6.1.5 Interface to alert management . 24
6.2 Accuracy . 24
6.2.1 Requirement . 24
6.2.2 Methods of test and required results . 25
6.3 Validity, plausibility, latency . 25
6.3.1 Validity . 25
6.3.2 Plausibility . 26
6.3.3 Latency. 27
6.4 Consistent common reference system (CCRS) . 27
6.4.1 Consistency of data . 27
6.4.2 Consistent common reference point (CCRP) . 28
6.4.3 Consistency of thresholds . 29
6.5 Integrity monitoring . 30
6.5.1 Requirement . 30
6.5.2 Methods of test and required results . 31
6.6 Marking of data . 32
6.6.1 Requirement . 32
6.6.2 Methods of tests and required results . 33
6.7 Selection of sensors and sources . 33
6.7.1 Requirement . 33
6.7.2 Methods of test and required results . 34
7 Module B – Task related requirements for integrated navigation systems . 34
7.1 Description . 34
7.2 Task and functional requirements for an INS . 34
7.2.1 General . 34

IEC 61924-2:2021 © IEC 2021 – 3 –
7.2.2 Task "Route planning" . 35
7.2.3 Task "Route monitoring" . 37
7.2.4 Task "Collision avoidance" . 41
7.2.5 Task "Navigation control data" . 45
7.2.6 Task "Alert management" . 46
7.2.7 Task "Status and data display" . 47
7.3 Functional requirements for INS task stations . 48
7.3.1 Number of task stations . 48
7.3.2 Track control . 50
7.3.3 Automatic control functions . 51
7.4 Functional requirements for displays of INS . 52
7.4.1 General . 52
7.4.2 Default display configurations and operational modes . 55
7.4.3 Mode and status awareness . 56
7.4.4 Information display . 56
7.5 Human machine interface . 58
7.5.1 General . 58
7.5.2 Equipment design . 58
7.5.3 Display . 59
7.5.4 Input . 59
7.6 INS back-up requirements and redundancies . 60
7.6.1 General . 60
7.6.2 Hardware redundancies (back-up) . 62
7.7 System failures and fallback arrangement . 62
7.7.1 General description . 62
7.7.2 Restored operation . 62
7.7.3 Failure or change of sensor for automatic control function . 63
7.7.4 Failure of sensor . 63
7.7.5 Storage of system related parameters . 64
7.7.6 Safe response to malfunction. 64
7.7.7 Alert management . 65
7.7.8 Fallback for navigational information failure . 65
7.8 Technical requirements . 67
7.8.1 General . 67
7.8.2 Hardware and/or processors . 67
7.8.3 Power supply . 68
7.8.4 Power interruptions and shutdown . 68
7.8.5 Data communication interface and protocols . 69
7.8.6 Installation . 69
8 Module C – Alert management . 70
8.1 Description . 70
8.1.1 Purpose of alert management . 70
8.1.2 Scope of alert management . 70
8.2 General requirements . 71
8.2.1 Provisions . 71
8.2.2 Requirement . 71
8.2.3 Methods of test and required results . 72
8.3 Transfer to BNWAS . 72
8.3.1 Requirement . 72

– 4 – IEC 61924-2:2021 © IEC 2021
8.3.2 Methods of test and required results . 72
8.4 Testing of alerts . 72
8.4.1 Requirement . 72
8.4.2 Methods of test and required results . 73
8.5 Failures . 73
8.5.1 Requirement . 73
8.5.2 Methods of test and required results . 73
9 Module D – Documentation requirements . 73
9.1 Manuals . 73
9.1.1 Requirement . 73
9.1.2 Methods of tests and required results . 74
9.2 Information regarding the system configuration . 74
9.2.1 Requirement . 74
9.2.2 Methods of tests and required results . 75
9.3 Failure analysis . 75
9.3.1 Requirement . 75
9.3.2 Methods of test and required results . 75
9.4 Onboard familiarization material . 75
9.4.1 Requirement . 75
9.4.2 Methods of test and required results . 75
Annex A (informative) Modular structure for IMO performance standards . 76
A.1 Modular structure for radar performance standards . 76
A.2 Modular structure for track control performance standards . 78
Annex B (informative) Guidance to equipment manufacturers for the provision of on-
board familiarization material . 79
B.1 General . 79
B.2 On-board familiarization training for INS . 79
B.3 Familiarization training framework . 80
B.3.1 General description . 80
B.3.2 Detailed operation (normal conditions) . 80
Annex C (normative) Classification of alerts . 82
Annex D (normative) Default display configurations . 85
Annex E (informative) Data flow diagram/consistent common reference system
(CCRS) . 87
Annex F (normative) Interfaces . 89
Annex G (informative) Guidance for testing . 94
G.1 Methods of test derived from ISO 9241-12 . 94
G.2 Observation . 94
G.3 Inspection of documented evidence . 94
G.4 Measurement . 95
G.5 Analytical evaluation . 95
Annex H (normative) Verification of CCRP calculations . 96
H.1 Scenario for verification of CCRP calculations . 96
H.2 Stationary scenario . 96
H.3 Dynamic scenario . 97
Annex I (normative) Sentence for integrity and plausibility . 98
Annex J (normative) INS alert related communication . 99
J.1 Overview. 99

IEC 61924-2:2021 © IEC 2021 – 5 –
J.2 Use of ALR for BNWAS . 99
J.3 Use of ALR and ACK for legacy simple sensors . 99
J.4 Use of HBT, ALF, ALC, ACN, AGL and ARC . 99
J.5 INS standardized alert identifiers . 99
J.6 Alert state transition diagram . 99
Annex K (informative) Sentences for advanced alert related communication . 100
Bibliography . 101

Figure E.1 – Data flow diagram/consistent common reference system (CCRS) . 88
Figure F.1 – INS logical interfaces . 89

Table 1 – Applicable modules of performance standards of stand alone equipment. 21
Table 2 – Applicable modules of other standards for INS to substitute for individual
equipment . 21
Table 3 – Marking of data . 33
Table A.1 – Modular structure for radar performance standards . 76
Table A.2 – Modular structure for track control performance standards . 78
Table C.1 – Classification of INS alerts as specified in these performance standards . 82
Table C.2 – Classification for INS for alerts specified in the individual equipment
performance standards . 83
Table D.1 – Task "Route monitoring" . 85
Table D.2 – Task "Collision avoidance" . 86
Table F.1 – IEC 61162-1 sentences transmitted by the INS . 90
Table F.2 – IEC 61162-1 sentences received by the INS . 91
Table H.1 – Required results . 96
Table H.2 – Required results . 97
Table H.3 – Required results for dynamic scenario . 97
Table H.4 – Required resolution for test . 97

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND
RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS –
INTEGRATED NAVIGATION SYSTEMS (INS) –

Part 2: Modular structure for INS –
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 technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61924-2 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 2012, of which it
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of a requirement for INS to provide capability for Maritime Safety Information to
comply with requirements of the International Maritime Organization;

IEC 61924-2:2021 © IEC 2021 – 7 –
b) modification of Clause 8 (Alert management) and associated annexes to align it with
IEC 62923-1 concerning bridge management;
c) modifications to Annex D to incorporate newer recommendations of the International
Maritime Organization.
The text of this International Standard is based on the following documents:
FDIS Report on voting
80/977/FDIS 80/970/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61924 series, published under the general title Maritime
navigation and radiocommunication equipment and systems – Integrated navigation systems
(INS), can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 8 – IEC 61924-2:2021 © IEC 2021
MARITIME NAVIGATION AND
RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS –
INTEGRATED NAVIGATION SYSTEMS (INS) –

Part 2: Modular structure for INS –
Operational and performance requirements,
methods of testing and required test results

1 Scope
This part of IEC 61924 specifies the minimum requirements for the design, manufacture,
integration, methods of testing and required test results for an integrated navigation system
(INS) to comply with the International Maritime Organization (IMO) requirements of Resolution
MSC.252(83), as amended by Resolution MSC.452(99). In addition, it takes account of IMO
Resolution A.694(17) to which IEC 60945 is associated. When a requirement in this document
is different from IEC 60945, the requirement of this document takes precedence.
For bridge alert management, IMO Resolution MSC.302(87) supersedes IMO Resolution
MSC.252(83). Accordingly, this document incorporates references to IEC 62923-1 and
IEC 62923-2 which are associated with Resolution MSC.302(87) for requirements and tests,
where applicable. This document indicates which requirements and associated tests of
MSC.252(83) have been superseded by MSC.302(87).
NOTE All text of this document whose wording is identical to that in IMO Resolution MSC.252(83), as amended by
MSC.452(99), is printed in italics and the Resolution and paragraph number indicated between brackets.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60945:2002, Maritime navigation and radiocommunication equipment and systems –
General requirements – Methods of testing and required test results
IEC 61162-1:2016, Maritime navigation and radiocommunication equipment and systems –
Digital interfaces – Part 1: Single talker and multiple listeners
IEC 61162-2, Maritime navigation and radiocommunication equipment and systems – Digital
interfaces – Part 2: Single talker and multiple listeners, high-speed transmission
IEC 61162-450, Maritime navigation and radiocommunication equipment and systems –
Digital interfaces – Part 450: Multiple talkers and multiple listeners – Ethernet interconnection
IEC 61174:2015, Maritime navigation and radiocommunication equipment and systems –
Electronic chart display and information system (ECDIS) – Operational and performance
requirements, methods of testing and required test results
IEC 62065:2014, Maritime navigation and radiocommunication equipment and systems –
Track control systems – Operational and performance requirements, methods of testing and
required test results
IEC 61924-2:2021 © IEC 2021 – 9 –
IEC 62288, Maritime navigation and radiocommunication equipment and systems –
Presentation of navigation-related information on shipborne navigational displays – General
requirements, methods of testing and required test results
IEC 62388:2013, Maritime navigation and radiocommunication equipment and systems –
Shipborne radar – Performance requirements, methods of testing and required test results
IEC 62616, Maritime navigation and radiocommunication equipment and systems – Bridge
navigational watch alarm system (BNWAS)
IEC 62923-1:2018, Maritime navigation and radiocommunication equipment and systems –
Bridge alert management – Part 1: Operational and performance requirements, methods of
testing and required test results
ISO 11674, Ships and marine technology – Heading control systems
IMO A.694(17), General requirements for shipborne radio equipment forming part of the
Global maritime distress and safety system (GMDSS) and for electronic navigational aids
IMO/ICAO, International Aeronautical and Maritime Search and Rescue Manual (IAMSAR
Manual) Volume 3
IMO MSC/Circ.982, Guidelines on ergonomic criteria for bridge equipment and layout
IMO MSC.191(79), Performance standards for presentation of navigation-related information
on shipborne navigational displays
IMO MSC.232(82), Revised performance standards for Electronic Chart Display and
Information Systems (ECDIS)
IMO MSC.252(83), Performance Standards for Integrated Navigation Systems (INS)
IMO MSC.452(99), Amendments to the revised performance standards for integrated
navigation systems (INS) (Resolution MSC.252(83))
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
accuracy
degree of conformance between the estimated or measured parameter value at a given time
and its true parameter value at that time
3.1.2
added value
functionality and information, which are provided by the INS, in addition to the requirements of
the performance standard for the individual equipment

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3.1.3
aid to navigation
AtoN
device or system external to a vessel intended to assist a navigator to determine position or
safe course, or to warn of hazards to navigation
3.1.4
AIS ASM
AIS application specific messages that are included in IEC 62288
3.1.5
alarm
condition requiring immediate attention and action by the bridge team, to maintain the safe
navigation of the ship
3.1.6
alert
announcement of abnormal situations and conditions requiring attention
Note 1 to entry: Alerts are divided in four priorities: emergency alarms, alarms, warnings and cautions. An alert
provides information about a defined state change in connection with information about how to announce this event
in a defined way to the system and the operator.
3.1.7
alert announcement
visual and, where applicable, acoustical presentation of alerts
3.1.8
alert history list
accessible list of past alerts
3.1.9
alert management
concept for the harmonized regulation of the monitoring, handling, distribution and
presentation of alerts on the bridge
3.1.10
announcement
visual and/or audible signal issued to the user by the system
3.1.11
automatic control functions
functions that include automatic heading, and/or track and/or speed control or other
navigation related automatic control functions
3.1.12
backup
use of data, function and/or hardware of similar type and quality
3.1.13
Category A alert
alert where graphical, for example radar, ECDIS, information at the task station directly
assigned to the function generating the alert is necessary, as decision support for the
evaluation the alert related condition
3.1.14
Category B alert
alerts where no additional information for decision support is necessary besides the
information which can be presented at the central alert management HMI

IEC 61924-2:2021 © IEC 2021 – 11 –
3.1.15
caution
lowest-priority alert
awareness of a condition which does not warrant an alarm or warning condition, but still
requires attention out of the ordinary consideration of the situation or of given information
3.1.16
collision avoidance
navigational task of detecting and plotting other ships and objects to avoid collisions
3.1.17
configuration in use
sub-systems (e.g. sensors and sources, MFD workstations, automatic control function, etc.)
selected for use and tasks (e.g. collision avoidance, route monitoring, etc.) selected operative
in each MFD
Note 1 to entry: This is a subset of the available configuration which is a subset of the complete syst
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