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EUROPEAN STANDARD
EN 61924
NORME EUROPÉENNE
June 2006
EUROPÄISCHE NORM
ICS 47.020.70
English version
Maritime navigation and radiocommunication
equipment and systems -
Integrated navigation systems -
Operational and performance requirements,
methods of testing and required test results
(IEC 61924:2006)
Matériels et systèmes de  Navigations- und
navigation et de radiocommunication - Funkkommunikationsgeräte
Systèmes de navigation intégrés - und -systeme für die Seeschifffahrt -
Exigences opérationnelles et Integrierte Navigationssysteme -
de fonctionnement, Betriebs- und Leistungsanforderungen,
méthodes d'essai et résultats exigibles Prüfverfahren und
(CEI 61924:2006) geforderte Prüfergebnisse
(IEC 61924:2006)
This European Standard was approved by CENELEC on 2006-06-01. 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 Central Secretariat or to any CENELEC member.

This European Standard exists in two official versions (English and 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
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61924:2006 E
Foreword
The text of document 80/433/FDIS, future edition 1 of IEC 61924, prepared by IEC TC 80, Maritime
navigation and radiocommunication equipment and systems, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 61924 on 2006-06-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2007-03-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-06-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61924:2006 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 61924:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60945 2002 Maritime navigation and radiocommunication EN 60945 2002
equipment and systems - General
requirements - Methods of testing and
required test results
1) 2)
IEC 61162-1 - Maritime navigation and radiocommunication EN 61162-1 2000
equipment and systems - Digital interfaces -
Part 1: Single talker and multiple listeners

1) 2)
IEC 61162-2 - Maritime navigation and radiocommunication EN 61162-2 1998
equipment and systems - Digital interfaces -
Part 2: Single talker and multiple listeners,
high-speed transmission
IEC 61174 2001 Maritime navigation and radiocommunication EN 61174 2001
equipment and systems - Electronic chart
display and information system (ECDIS) -
Operational and performance requirements,
methods of testing and required test results

IEC 61209 1999 Maritime navigation and radiocommunication EN 61209 1999
equipment and systems - Integrated bridge
systems (IBS) - Operational and performance
requirements, methods of testing and
required test results
IEC 62065 2002 Maritime navigation and radiocommunication EN 62065 2002
equipment and systems - Track control
systems - Operational and performance
requirements, methods of testing and
required test results
1)
IMO A.224(VII) - Performance standards for echo-sounding - -
equipment
1)
IMO A.424(XI) - Performance standards for gyro-compasses - -

1)
IMO A.529(XIII) - Accuracy standards for navigation - -

1)
Undated reference.
2)
Valid edition at date of issue.

Publication Year Title EN/HD Year
1)
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
1)
IMO A.815(19) - Worldwide radionavigation system - -

1)
IMO A.821(19) - Performance standards for gyro-compasses - -
for high-speed craft
1)
IMO A.823(19) - Performance standards for automatic radar - -
plotting aids (ARPAs)
1)
IMO A.824(19) - Performance standards for devices to indicate - -
speed and distance
1)
IMO A.830(19) - Code on alarms and indicators - -

1)
IMO A.893(21) - Guidelines for voyage planning - -

IMO 1974 International Convention for the Safety of Life - -
at Sea (SOLAS)
1)
IMO MSC.64(67) - Recommendation on performance standards - -
Annex 1 for integrated bridge systems (IBS)

1)
IMO MSC.64(67) - Recommendation on performance standards - -
Annex 4 for radar equipment
1)
IMO MSC.86(70) - Performance standards for an integrated - -
Annex 3 navigation system (INS)

ISO 11674 2000 Ships and marine technology - Heading - -
control systems
INTERNATIONAL IEC
STANDARD 61924
First edition
2006-05
Maritime navigation and radiocommunication
equipment and systems –
Integrated navigation systems –
Operational and performance requirements,
methods of testing and required test results

 IEC 2006  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, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale XA
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 61924  IEC:2006(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references .7
3 Terms, definitions and abbreviations .8
4 Functional requirements and application.14
4.1 General .14
4.2 Basic functions.16
4.3 Functional integration.16
4.4 Interfacing and data exchange .16
4.5 Accuracy and performance .17
4.6 Consistent common reference system (CCRS) .17
4.7 Integrity monitoring.18
4.8 Marking of data .20
4.9 Generation of alarms and warnings .21
4.10 INS display.21
4.11 Configuration display.22
4.12 Malfunctions.22
4.13 INS alarm management .23
4.14 Human machine interface (HMI) .26
4.15 Power supply.27
4.16 Failure analysis .28
4.17 Quality assurance .28
4.18 Manuals .28
5 Requirements applicable to INS(A).29
6 Requirements applicable to INS(B).29
6.1 General .29
6.2 Route planning and route monitoring .29
7 Requirements applicable to INS(C).29
7.1 Heading or track control system .29
7.2 Operator control and display functions .30
7.3 Reversionary mode .30
8 Test requirements and results .30
8.1 General .30
8.2 Exceptions for tests previously performed .30
8.3 Test site .30
8.4 Documentation check .31
8.5 Compliance tests.31

61924  IEC:2006(E) – 3 –
Annex A (normative) IMO Resolution MSC 86(70) Annex 3 (adopted on 8 December 1998)
Recommendation on performance standards for an integrated navigation system (INS).47
Annex B (informative) Data flow diagram/consistent common reference system (CCRS).53
Annex C (normative) IEC 61162 output interfaces.55
Annex D (informative) Alarm and warning conditions .56

Figure B.1 – Data flow diagram/consistent common reference system (CCRS) .54

Table 1 – Marking and use of data .21
Table 2 – Announcement for conditions requiring attention .25
Table 3 – Alarm acknowledgement/silencing definitions .25
Table C.1 – IEC 61162 sentences transmitted by the INS .55
Table D.1 – Alarm and warning conditions .56

– 4 – 61924  IEC:2006(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS –
INTEGRATED NAVIGATION SYSTEMS –
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 has been prepared by IEC technical committee 80: Maritime
navigation and radiocommunication equipment and systems.
The text of this standard is based on the following documents:
FDIS Report on voting
80/433/FDIS 80/440/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 2.

61924  IEC:2006(E) – 5 –
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this standard may be issued at a later date.

– 6 – 61924  IEC:2006(E)
INTRODUCTION
International Standard IEC 61924 has been developed by IEC Technical Committee 80 to
clarify the IMO Resolution MSC 86(70) Annex 3 Recommendation on Performance Standards
for an Integrated Navigation System (INS). This standard provides adequate requirements,
methods of tests and required test results to facilitate type approval.

61924  IEC:2006(E) – 7 –
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS –
INTEGRATED NAVIGATION SYSTEMS –
OPERATIONAL AND PERFORMANCE REQUIREMENTS,
METHODS OF TESTING AND REQUIRED TEST RESULTS

1 Scope
This International Standard 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 86(70) Annex 3. (See Annex A).
This standard aims to resolve conflicts that may occur from the differences in the
requirements of the relevant IMO Performance Standards for individual navigational aids
when forming part of the INS.
All text of this standard, whose meaning is identical to that in IMO Resolution MSC 86(70)
Annex 3 will be printed in italics and the Resolution and paragraph number indicated
between brackets.
This standard is applicable to an INS, that is any combination of navigational aids that
provides functions beyond the general intent defined in the respective performance standards
adopted by the Organization for individual equipment (MSC 86(70) Annex 3, 2.1).
2 Normative references
The following referenced documents are indispensable for the application 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, 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 61174:2001, 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 61209:1997, Maritime navigation and radiocommunication equipment and systems –
Integrated bridge systems (IBS) – Operational and performance requirements, methods of
testing and required test results
IEC 62065:2002, Maritime navigation and radiocommunication equipment and systems –
Track control systems – Operational and performance requirements, methods of testing and
required test results
– 8 – 61924  IEC:2006(E)
IMO A.224(VII) as amended by MSC.74(69) Annex 4, Performance standards for echo-
sounding equipment
IMO A.424 (XI), Performance standards for gyro-compasses
IMO A.529 (XIII), Accuracy standards for navigation
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 A.815(19), World-wide radionavigation system
IMO A.821(19), Performance standards for gyro-compasses for high speed craft
IMO A.823(19), Performance standards for automatic radar plotting aids
IMO A.824(19), Performance standards for devices to indicate speed and distance
IMO A.830(19), Code on alarms and indicators
IMO A.893(21), Guidelines for voyage planning
IMO 1974, International Convention for the Safety of Life at Sea (SOLAS), as amended
IMO MSC.64 (67) Annex 1, Recommendation on performance standards for integrated bridge
systems (IBS)
IMO MSC.64 (67) Annex 4, Recommendation on performance standards for radar equipment
IMO MSC 86(70) Annex 3, Performance standards for an integrated navigation system (INS)
ISO 11674: 2000, Ships and marine technology – Heading control systems
3 Terms, definitions and abbreviations
For the purposes of this document, the following terms, definitions and abbreviations apply.
3.1 Terms and definitions
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
3.1.3
aid to navigation
any 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

61924  IEC:2006(E) – 9 –
3.1.4
alarm
audible signal or audible and visual signal announcing a condition requiring immediate
attention or user action
3.1.5
alarm management
functions provided by an INS for harmonising, processing, monitoring and distributing audible
and visual announcements and their acknowledgement, silencing and cancelling operations
NOTE The alarm management function administers different levels of announcements: alarms, warnings and
indications.
3.1.6
announcement
visual or audible signal issued to the user by the system
3.1.7
automatic control system
control system that may include a heading, track or speed control system
3.1.8
conning position
place on the bridge with a commanding view and which is used by navigators when
commanding, manoeuvring and controlling a ship
3.1.9
consistent common reference point
location in a ship to which all measurements such as own ship’s position, target range,
bearing, relative course, relative speed, pitch and yaw are referred. Typically, this is the
conning position on the bridge, but may, for example be the origin of the reference axes of the
ship
3.1.10
consistent common reference system
CCRS
sub-system (or function) of an INS for acquisition, processing, storage and distribution of data
and information, providing identical and obligatory reference to sub-systems within an INS.
The CCRS is the means to ensure that all parts of the INS use the same source and values
for a specific type of system data and essential information, for example own ship position,
speed through water, heading, time, etc.
3.1.11
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
3.1.12
entry field
location on a display for the input of data by the operator. The requested information is
usually alphanumeric
3.1.13
essential information
information required for the fundamental functions of the INS. This includes as a minimum
position, speed, heading and time

– 10 – 61924  IEC:2006(E)
3.1.14
expected precision
deviation between the measured value and the true value that is normally not exceeded by a
typical system
3.1.15
functionality
ability to perform an intended function. The activity of performing a function normally employs
a system of displays, controls and instrumentation
3.1.16
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
3.1.17
indication
visual information about the condition of a system or equipment
3.1.18
inspection
visual check of the equipment or documentation
3.1.19
integrated navigation system
combination of systems or functions of navigational aids that are interconnected to increase
safe and efficient navigation when used by suitably qualified personnel
3.1.20
integrity
property of information as being accurate and valid with regard to specified requirements and
verified by comparing data from more than one independent source
3.1.21
integrity monitoring
ability of a system to provide the user with information within the specified accuracy in a
timely, complete and unambiguous manner, and alarms and indications within a specified time
when the system should be used with caution or not at all
3.1.22
known hazard
hazard retrieved from a database (including navigational charts and nautical publications) or
manually input and which is available to the INS
3.1.23
latency
time interval between an event and its result, including time for reception, processing,
transmission and display
3.1.24
leg
the ship’s intended ground track between two waypoints

61924  IEC:2006(E) – 11 –
3.1.25
manufacturer
organisation responsible for the production of all or some of the parts of the INS, including the
responsibility that these parts meet their individual international standards. A manufacturer
may also be the system integrator
3.1.26
marking
visual or logical indication of the status of displayed or transferred information
3.1.27
mode
the setting of a group of parameters determining the behaviour (operational modes) or the
Human Machine Interface (HMI) (display modes) or the control functions (control modes) of
the equipment or its sensors
3.1.28
mode awareness
perception of the mariner regarding the currently active Modes of Control, Operation and
Display of the INS including its subsystems, as supported by the presentations and
indications at an INS display or workstation
3.1.29
multifunction display
single visual display unit that can present, either simultaneously or through a series of
selectable pages, information from more than one operation of a system
3.1.30
navigation
process of planning, executing, monitoring and recording the progress of a safe and
expeditious voyage of a vessel
3.1.31
navigational aid
ship-borne device that complies with its relevant International Standard(s), for example
instrument, method or chart, intended to assist in the navigation of a ship.
3.1.32
part
individual INS subsystem, equipment or functional module
3.1.33
passage
process of moving a ship from one place to another by navigating through a certain area
within a certain period of time and in compliance with certain environmental and legal
provisions
3.1.34
performance check
functional check to show that the system or component is still operational without
investigating all details of its functionality
3.1.35
plausibility
quality of being believable or trustworthy

– 12 – 61924  IEC:2006(E)
3.1.36
primary navigation data/information
data of own ship's position, speed, heading, time and, in case of INS(B) and if available
depth, provided by selected sensors, to be used in the system for processing the navigational
information
3.1.37
route
representation of a voyage or passage geographically defined by a point of departure, a point
of arrival and usually by intermediate waypoints. It may include time of departure and/or ship's
speed as well as parameters and limits for safe navigation such as off-track limit, turn radius,
time references, etc. and as defined in IMO Resolution A.893(21)
3.1.38
selected route or track
route or track which has been chosen for monitoring the performance of the navigation. The
term “track” is typically used for systems that have automatic track control capability
3.1.39
sensor
navigational aid, with or without its own display and control as appropriate, automatically
providing information to the INS
3.1.40
situation awareness
perception of the mariner regarding the prevailing nautical situation and the currently active or
available system resources, as supported by the presentations and indications at an INS
display or workstation. It includes mode awareness
3.1.41
system data
data that is used by the system for the processing and display of essential information.
System data of the same type is from the same source. System data, at least for primary
navigation information, has been checked for integrity
3.1.42
system integrator
organisation responsible for ensuring that the INS complies with the requirements of this
standard
3.1.43
track
geographical representation of the movement actually performed by the ship, or, in case of a
track control system, the path (over ground) to be (automatically) followed
3.1.44
validity
conformity of information with formal and logical criteria, or the marking of data as being good
or no good (valid or invalid) for the intended use
3.1.45
vessel
water craft of any description, including non-displacement craft, WIG craft and seaplanes,
used or capable of being used as a means of transportation on water
3.1.46
voyage
execution of all aspects of the operation of a craft in journeying from the point of departure to
the final destination. A voyage may consist of one or more passages

61924  IEC:2006(E) – 13 –
3.1.47
warning
signal announcing a condition requiring non-immediate attention for precautionary reasons
3.1.48
waypoint
geographically defined position used as reference for navigation along a leg, track or route
3.1.49
workstation for INS or INS workstation
workstation at which display or operator control functions are provided to meet the require-
ments of this standard. An INS workstation need not be a physical part of the INS. It may just
be the location where the necessary displays and controls are situated
3.2 Abbreviations
AIS Automatic identification system
ARPA Automatic radar plotting aid
ATA Automatic tracking aid
AtoN Aid to navigation
CCRS Consistent common reference system
COG Course over ground
DR  Dead reckoning
ECDIS Electronic chart display and information system
EUT Equipment under test
EPA Electronic plotting aid
EPFS Electronic position fixing system
GNSS Global navigation satellite system
HCS Heading control system
HMD Heading measuring device
HMI Human machine interface
IBS Integrated bridge system
IMO International Maritime Organization
IEC International Electrotechnical Commission
INS Integrated navigation system
ISO International Organization for Standardization
LORAN Long range navigation system
MSC Marine Safety Committee
OOW Officer in charge of the navigational watch (Officer of the Watch)
RAIM Receiver autonomous integrity monitoring
ROT Rate of turn
SDME Speed and distance measuring equipment
SOG Speed over the ground
SOLAS Safety of life at sea
THD Transmitting heading device

– 14 – 61924  IEC:2006(E)
4 Functional requirements and application
NOTE Clarification of minimum requirements is given in Annex B.
4.1 General
In addition to meeting the relevant requirements of Resolution A.694(17) to which IEC 60945
is associated, the INS shall comply with the requirements of the IMO Performance Standards
MSC 86(70) Annex 3, as clarified in this standard.
4.1.1 Purpose
The purpose of this standard is to support proper and safe integration of navigational
equipment and information. (MSC 86(70) Annex 3, 2.2).
4.1.2 Purpose of an integrated navigation system (INS)
The purpose of an integrated navigation system (INS) is to provide 'added value' to the
functions and information needed by the officer in charge of the navigational watch (OOW) to
plan, monitor or control the progress of the ship (MSC 86(70) Annex 3, 1.1).
A functional description shall be provided with a description of how the INS ‘’added value’ is
achieved.
4.1.3 Compliance
Each part of the INS shall comply with the applicable requirements adopted by IMO, including
the requirements of IMO resolution MSC 86(70) Annex 3. Parts executing multiple operations
shall meet the requirements specified for each individual function they can control, monitor or
perform. (MSC 86(70), 4.1.2).
A sensor or part thereof is not part of the INS if it only supplies data and does not perform
other functions of the INS as required by this standard.
An actuator and its associated control system or part thereof (for example steering gear
control system, propulsion control system, fin stabilising system) is not part of the INS if it
only receives data or commands and does not perform other functions of the INS as required
by this standard.
4.1.4 Equipment required
The INS consists of the equipment that provides the functions going beyond the general intent
of independent equipment and international standards and the additional equipment required
to meet this standard.
4.1.5 Mode and situation awareness
The INS supports mode and situation awareness. (MSC 86(70) Annex 3, 1.2) within the scope
of functions provided by the relevant category of INS(A), (B), or (C).
4.1.6 Three INS categories
If a combination of navigational aids has been determined to be an INS as per 4.1.4, one of
the following INS categories applies.

61924  IEC:2006(E) – 15 –
4.1.7 INS(A)
The requirements of this standard for INS(A) (see Clause 5) are applicable to any INS that
provides the minimum functional requirements of the INS, including a consistent common
reference system. (MSC 86(70) Annex 3, 2.3.1). The INS(A), as a minimum, provides the
information of position, speed, heading and time, each clearly marked with an indication of
integrity (MSC.86(70), 4.1.7).
4.1.8 INS(B)
The requirements of this standard for INS(B) (see Clause 6) are applicable to any INS that, in
addition to the functional requirements of INS(A), provides the information needed for
decision support in avoiding hazards (MSC 86(70) Annex 3, 2.3.2). The INS(B) automatically,
continually and graphically indicates the ship's position, speed and heading and, where
available, depth (see note) in relation to the planned route as well as to known and detected
hazards (MSC.86(70), 4.1.8).
An INS(B) is any INS that includes a (geo-) graphical display for decision support in avoiding
hazards, such as a radar, radar plotting aid or ECDIS, if:
• the additional functionality resulting from the combination of navigational aids goes
beyond the general intent as defined in the respective performance standard;
• the category INS(C) as per 4.1.9 does not apply.
NOTE “where available, depth” means: if an echo sounder with suitable interface is installed and in use.
4.1.9 INS(C)
The requirements of this standard for INS(C) (see Clause 7) are applicable to any INS that, in
addition to the functional requirements of INS(B), provide the automatic control functions of
heading, track or speed (MSC 86(70) Annex 3, 2.3.3), and monitor the performance and
status of these controls (MSC 86(70) Annex 3, 4.1.9).
4.1.10 Requirements for all categories
The requirements of this clause are applicable to all three categories of INS, except where
otherwise stated. The requirements specific to INS(A), INS(B) and INS(C) are detailed in
Clauses 5, 6 and 7 respectively. The relevant category of the INS shall be declared.
4.1.11 Passage execution
The function of passage execution in an Integrated Bridge system (IBS), as defined by IMO in
Resolution MSC.64(67) Annex 1 and related IEC 61209, may be performed by an INS which
should at least be an INS(B) (MSC.86(70), 1.5).
4.1.12 Safety of navigation support
The INS supports safety of navigation by evaluating inputs from several independent and
different sensors, combining them to provide information giving timely warnings of potential
dangers and degradation of integrity of this information. Integrity monitoring is an intrinsic
function of the INS (MSC 86(70) Annex 3, 1.3) as required by its category INS(A), (B), or (C).
4.1.13 Consideration of human factors
The INS aims to ensure that, by taking human factors into consideration, the work load is kept
within the capacities of the OOW and other mariners on the bridge in order to enhance safe
and expeditious navigation and to complement the mariner’s capabilities, while at the same
time to compensate for their limitations (MSC 86(70) Annex 3, 1.4), as required by its
category of INS(A), (B) or (C).

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4.2 Basic functions
4.2.1 Combination, processing and evaluation
The INS shall combine, process and evaluate data from all sensors in use (MSC 86(70)
Annex 3, 4.1.5) for obtaining information of speed, heading, position and time for the
purposes of the integrity evaluation specified in 4.7.
4.2.2 Mode and situation awareness
The INS shall support mode and situation awareness (MSC 86 (70) Annex 3, 1.2) and shall
fulfil this requirement through functional integration, processing and display by providing:
• validated data, where possible, of all connected navigation sensors (see 4.4.3);
• the specified INS information and its status, including modes of operation and display;
• changes to this information and appropriate alarms and indications, as required by the INS
category.
4.3 Functional integration
The INS shall provide functional integration meeting the following requirements (MSC 86(70)
Annex 3, 4.1.16) of this subclause.
4.3.1 Multifunction display
Where a display or control is presented on a multifunction display unit then these shall be
redundantly available (MSC 86(70) Annex 3, 4.1.16.1). The failure of a single multifunction
display shall not result in the loss of a function mandated by the carriage requirements of
SOLAS.
4.4 Interfacing and data exchange
Interfacing to, and from, the INS shall comply with International Standards, namely IEC 61162
series, as appropriate and applicable (MSC 86(70) Annex 3, 7) as follows:
4.4.1 Interfacing stand-alone equipment
Stand-alone equipment, for which performance standards adopted by IMO exist, when
connected to the INS, shall comply with the IEC 61162 series as applicable, for data
exchange and interfacing (MSC 86(70) Annex 3, 4.1.12). Where no suitable IEC 61162
interface is defined, an alternative interface may be used. Details about the available
interfaces and functions supported thereby shall be included in the installation manual. Where
the datum reference sentence (DTM) is received in accordance with IEC 61162-1 then it shall
be evaluated and processed accordingly.
4.4.2 Plausibility checks
Received or derived data that is used or distributed by the INS shall be checked for plausible
magnitudes of values.
Examples:
• heading of 361° is not plausible;
• magnitudes of actual velocity greater than the maximum ship’s speed are not plausible
(plausibility check with known parameter of ship’s dynamics);
• magnitude of actual ROT greater than the maximum ship’s ROT is not plausible
(plausibility check with known parameter of ship’s dynamics).

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Data which has failed the plausibility checks shall not be used by the INS and this shall not
affect functions not dependent on these data (see Table 1).
4.4.3 Validity checks
Validity of the data shall be provided for each part to be integrated (MSC 86(70) Annex 3,
4.1.16.2).
The data received, used or distributed by the INS shall be checked for validity marking by the
sensor. Data that has failed the validity checks shall not be used by the INS and this shall not
affect functions not dependent on these data (see Table 1).
4.4.4 Integrity of data exchange
The integrity of the data exchange within the INS shall be ensured (MSC 86(70)
Annex 3, 4.1.14) (see Table 1).
4.4.5 Data output
Data output from the INS shall comply with the IEC 61162 series as applicable. The
sentences specified in Annex C of this standard shall be provided. Where no suitable
IEC 61162 interface is defined proprietary sentences or an alternative interface may be used.
Details about the available interfaces shall be included in the installation manual.
Where interfaces with IEC 61162-1 sentences are used:
• positional information shall be transmitted in the WGS84 datum using the datum reference
sentence (DTM) in accordance with IEC 61162-1;
• system data and other data checked for integrity, modified or generated by the INS shall
be transmitted with the talker identifier “IN”; otherwise the talker identifier of the source
shall be used.
4.5 Accuracy and performance
As a minimum, the accuracy and other properties of information shall meet the requirements
of the resolutions adopted by IMO for the individual navigational aids connected to or forming
part of the system. Additionally the INS shall not degrade the accuracy of the data provided
by the sensors (MSC 86(70) Annex 3, 4.2.4).
NOTE Other properties may include update rate, range, resolution, validity, etc. as specified in the relevant
standards.
4.6 Consistent common reference system (CCRS)
The INS shall ensure that the different types of information are distributed to the relevant
parts of the system, applying a ‘consistent common reference system’ for all types of
information (MSC 86(70) Annex 3, 4.1.6).
Information from the CCRS shall be:
a) referenced to same place and time;
b) compensated for latency as defined in 4.6.1;
c) checked for validity;
d) checked for plausibility.
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IMO Resolutions A.529(13) and A.815(19)

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The data shall be presented with a warning when it is not possible to perform the calculations
required in a) and b). The data shall be marked as invalid if the tests c) or d) fail in
accordance with Table 1.
The CCRS shall ensure that all parts of the INS are provided with the same type of
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