IEC 61924-2:2021

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
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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

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

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

– 6 – IEC 61924-2:2021 © IEC 2021
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
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6) All users should ensure that they have the latest edition of this publication.
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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;

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 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

– 10 – IEC 61924-2:2021 © IEC 2021
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

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 system
configuration.
3.1.18
conning position
place on the bridge with a commanding view and which is used by navigators when
commanding, manoeuvring and controlling a ship
3.1.19
consistent common reference point
CCRP
location on own ship, to which all horizontal measurements such as target range, bearing,
relative course, relative speed, closest point of approach (CPA) or time to closest point of
approach (TCPA) are referenced, typically the conning position of the bridge
3.1.20
consistent common reference system
CCRS
sub-system or function of an INS for acquisition, processing, storage, surveillance and
distribution of data and information providing identical and obligatory reference to sub-
systems and subsequent functions within an INS and to other connected equipment, if
available
Note 1 to entry: Examples of reference are: coordinate system, time zone, chart datum and depth datum.
3.1.21
degraded condition
reduction in system functionality resulting from failure
3.1.22
detected hazard
hazard identified by a sensor (for example, radar or echo sounder) or reported by a
communication device (for example AIS or NAVTEX) and which is available to the INS
3.1.23
entry field
location on a display for the input of data by the operator
Note 1 to entry: The requested information is usually alphanumeric.
3.1.24
essential functions
indispensable functions to be available as required for the relevant operational use

– 12 – IEC 61924-2:2021 © IEC 2021
3.1.25
essential information
indispensable information to be available as required for the relevant functions
3.1.26
expected precision
deviation between the measured value and the true value that is normally not exceeded by a
typical system
3.1.27
external safety related messages
data received from outside of the ship concerning the safety of navigation, through equipment
listed in SOLAS chapter V and/or Maritime Safety Information (MSI) messages
Note 1 to entry: Sources of MSI are NAVTEX (IEC 61097-6), other IMO-recognized equipment accommodating
other providers of GMDSS terrestrially-based services and recognized mobile satellite service enhanced group
calling system (IEC 61097-4 and IEC 61097-16).
3.1.28
failure analysis
logical, systematic examination of an item, including its diagrams or formulas, to identify and
analyse the probability, causes and consequences of potential and real failures
3.1.29
fallback
use of data, function or hardware of degraded quality in relation to the failed one, for example
dead reckoning for position information, heading control in case of a failure of track control
3.1.30
functionality
ability to perform an intended function
Note 1 to entry: The activity of performing a function normally employs a system of displays, controls and
instrumentation.
3.1.31
hazard
objects or conditions potentially dangerous to navigation, possibly leading to grounding or
collision, that may be detected by a sensor, reported by a communication device, retrieved
from a database or manually input to the INS
3.1.32
human factor
workload, capabilities and limits of a user trained according to the regulations of the IMO
3.1.33
human machine interface
HMI
part of a system an operator interacts with
Note 1 to entry: The interface is the aggregate of means by which the users interact with a machine, device, and
system (the system). The interface provides means for input, allowing the users to control the system and output,
allowing the system to inform the users.
3.1.34
indication
display of regular information and conditions, not part of alert management

3.1.35
integrated navigation system
INS
composite navigation system which performs at least the following tasks: collision avoidance,
route monitoring thus providing "added value" for the operator to plan, monitor and safely
navigate the progress of the ship
Note 1 to entry: The INS allows meeting the respective parts of SOLAS regulation V/19 and supports the proper
application of SOLAS regulation V/15.
3.1.36
inspection
visual check of equipment or documentation
3.1.37
integrity
ability of the INS to provide the user with information within the specified accuracy in a timely,
complete and unambiguous manner, and alerts within a spec
...