IEC 61174:2001

INTERNATIONAL IEC
STANDARD
Second edition
2001-10
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
Reference number
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INTERNATIONAL IEC
STANDARD
Second edition
2001-10
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 2001  Copyright - all rights reserved
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International Electrotechnical Commission
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– 2 – 61174 © IEC:2001(E)
CONTENTS
FOREWORD.5

INTRODUCTION.7

1 Scope.8

2 Normative references .8

3 Definitions and abbreviations.9
3.1 Definitions .9
3.2 Abbreviations .11
4 Minimum operational and performance requirements.12
4.1 Introduction .12
4.2 ECDIS definitions .12
4.3 Display of SENC information .13
4.4 Provision and updating of chart information.14
4.5 Scale.15
4.6 Display of other navigational information .15
4.7 Display mode and generation of the neighbouring area .16
4.8 Colours and symbols .16
4.9 Display requirements.16
4.10 Route planning, monitoring and voyage recording .16
4.11 Accuracy .19
4.12 Connections with other equipment (Interfaces) .19
4.13 Performance tests, malfunction alarms and indications.19
4.14 Back-up arrangements .19
4.15 Power supply.20
5 Requirements contained in IHO special publications.20
5.1 Content and structure of chart data .20
5.2 Priority of chart display.20
5.3 Display of chart information .21
5.3.1 Scale and navigation purpose.21
5.3.2 Text.21

5.3.3 Units and legend .22
5.4 Display functions .22
5.4.1 Object information .22
5.4.2 Navigational information .23
5.4.3 Safety contour .23
5.4.4 Navigational calculations .23
5.5 Supplementary display functions .23
5.5.1 Additional mariner’s information.23
5.5.2 Additional non-HO information.24
5.5.3 Tidal adjustment .24
5.6 Use of the presentation library.24
5.7 Display characteristics.24

61174 © IEC:2001(E) – 3 –
5.8 Performance requirements .25

5.8.1 Redraw.25

5.8.2 Resolution .25

5.8.3 Number of colours .25

5.8.4 Brightness and contrast .26

5.9 Ergonomic requirements.26

5.10 Update of chart information .27

5.10.1 General .27

5.10.2 Manual update.28

5.10.3 Semi-automatic update.28

5.10.4 Reception of updates.28
5.10.5 Sequence check .29
5.10.6 Consistency check.29
5.10.7 Geographic applicability .29
5.10.8 Summary report.29
5.10.9 Review of ENC updates.29
5.10.10Modification of updates.29
6 Methods of testing and required test results .29
6.1 EUT installation and technical documentation.29
6.2 Interfaces .30
6.3 Environmental .30
6.4 Preparation .30
6.4.1 Power-up.30
6.4.2 Initial ship parameters .30
6.4.3 Required test items .31
6.5 Initial data tests.31
6.5.1 Presentation library .31
6.5.2 ENC .31
6.6 Accuracy .32
6.7 Visual requirements.32
6.7.1 Symbols .32
6.7.2 Units and legend .32
6.7.3 Colour table.33
6.7.4 Resolution .35
6.7.5 Display characteristics.36

6.8 Functional requirements .36
6.8.1 Standard display.36
6.8.2 Display base.36
6.8.3 All other information .36
6.8.4 Display priorities.36
6.8.5 Additional display functions .37
6.8.6 Scale and navigation purpose.37
6.8.7 Mode and orientation.38
6.8.8 Safety contour .38
6.8.9 Safety depth .38
6.8.10 Object information .38
6.8.11 Navigation related functions .39

– 4 – 61174 © IEC:2001(E)
6.8.12 Position integration.39

6.8.13 Radar and plotting information.40

6.8.14 Loading of corrupted data.40

6.8.15 Automatic updates.40

6.8.16 Manual updates .41

6.8.17 Self-tests of major functions .42

6.9 Operational requirements .42

6.9.1 Ergonomic principles .42

6.9.2 Route planning .42

6.9.3 Route monitoring .43

6.9.4 Twelve-hour log.44
6.9.5 Voyage record .44
6.9.6 Power supply.44
Annex A (normative) SENC information to be displayed during route planning
and route monitoring.45
Annex B (normative) Navigational elements and parameters.46
Annex C (normative) Areas for which special conditions exist .47
Annex D (normative) Alarms and indicators .48
Annex E (normative) Navigational symbols .49
Annex F (normative) ENC test data set .54
Annex G (normative) Back-up arrangements.57
Annex H (normative) ECDIS in the RCDS mode of operation .67
Annex I (normative) Alarms and indicators in the RCDS mode of operation.87
Annex J (normative) Scenario definitions and plots .88
Table 1 – Light levels.34
Table 2 – Light levels.35
Table 3 – Area, line and point objects .39

61174 © IEC:2001(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
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

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 International 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 61174 has been prepared by IEC technical committee 80: Maritime
navigation and radiocommunication equipment and systems.
This second edition of IEC 61174 cancels and replaces the first edition published in 1998, of
which it constitutes a technical revision.
The text of this standard is based on the following documents:

FDIS Report on voting
80/308/FDIS 80/316/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.
Annexes A, B, C, D, E, F, G, H, I and J form an integral part of this standard.

– 6 – 61174 © IEC:2001(E)
The committee has decided that the contents of this publication will remain unchanged until
June 2004. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or

• amended.
61174 © IEC:2001(E) – 7 –
INTRODUCTION
For this second edition of this International Standard, the maintenance team completed the

following tasks:
a) developed minimum operational and performance requirements for the RCDS mode of

operation in accordance with appendix 7 of the IMO performance standards as amended

by IMO resolution MSC.86, importing much of the text from appendix 7 to produce an

unambiguous and user-friendly annex H to this standard;

b) developed separate tests for back-up arrangements as defined by appendix 6 of the IMO

performance standards (see annex G);

c) clarified the colour tolerance requirements and created allowances for the separate testing
of monitors;
d) performed an extensive review of the standard to ensure proper referencing and language
throughout.
Technical committee 80 recognizes that there is further work to be accomplished in this
standard, and a future revision is anticipated within 12 to 18 months, to incorporate some
critical hydrographic considerations including the RNC test data set, several S-57 definitions
and tests and harmonisation of the navigation related symbols.

– 8 – 61174 © IEC:2001(E)
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

1 Scope
This International Standard specifies the performance requirements, methods of testing and
required test results of equipment conforming to performance standards not inferior to those
adopted by the IMO in resolution A.817 as amended by annex 5 to IMO resolution MSC.64
and annex 4 to IMO resolution MSC.86.
This standard is based upon the performance standards of IMO resolution A.817, and is also
associated with IMO resolution A.694 and IEC 60945. Reference is made, where appropriate,
to IMO resolution A.817, and all subclauses whose wording is identical to that in the
resolution are printed in italics.
In association with the above IMO resolution A.817, are the International Hydrographic
Organization (IHO) special publications S-52, S-57 and S-61. This standard has included
extracts from the above publications where they are applicable to this equipment. Where
reference is made, all subclauses whose wording is identical to that in the publications, are
printed in italics.
The requirements of this standard are not intended to prevent the use of new techniques in
equipment and systems, provided the facilities offered are not inferior to those stated.
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 60872-1: Maritime navigation and radiocommunication equipment and systems – Radar
plotting aids – Part 1: Automatic radar plotting aids (ARPA) – Methods of testing and required
test results
IEC 60945: Maritime navigation and radiocommunication equipment and systems – General
requirements – Methods of testing and required test results
IEC 61162 (all parts), Maritime navigation and radiocommunication equipment and systems –
Digital interfaces
ISO 9000 (all parts), Quality management and quality assurance standards
IMO Convention for safety of life at sea (SOLAS) 1997 (as amended)
IMO A.424:1979, Performance standards for gyro-compasses
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

61174 © IEC:2001(E) – 9 –
IMO A.817:1995, Performance standards for electronic chart display and information systems

(ECDIS)
IMO A.821:1995, Performance standards for gyro-compasses for high-speed craft

IMO A.823:1995, Performance standards for automatic radar plotting aids (ARPAs)

IMO A.824:1995, Performance standards for devices to indicate speed and distance

IMO MSC.64(67):1996, Annex 4 – Performance standards for radar equipment

IMO MSC.64(67):1996, Annex 5 – Amendment to IMO A.817

IMO MSC.86(70):1998, Annex 4 – Amendments to IMO A.817
IHO S-52:1996, Specifications for chart content and display aspects of ECDIS
IHO S-52, appendix 1:1996, Guidance on updating the electronic navigational chart
IHO S-52, appendix 2:1997 (as amended), Colour and symbol specifications for ECDIS
IHO S-52, appendix 3:1997, Glossary of ECDIS-related terms
IHO S-52, appendix 4: Test data set for use with IEC 61174
IHO S-57:1996 (as amended), Transfer standard for digital hydrographic data
IHO S-61:1999, Product specification for raster navigational charts (RNC)
3 Definitions and abbreviations
Definitions of ECDIS related terms pertaining to IMO performance standards for ECDIS are
listed in 4.2. A glossary of ECDIS related terms is included in S-52, appendix 3.
For the purpose of this International Standard the following definitions and abbreviations
apply.
3.1 Definitions
3.1.1
CIE colour calibration
procedure to confirm that the colour specified in S-52, appendix 2 is correctly reproduced on
the ECDIS display
3.1.2
common reference system
sensor input data, providing identical and obligatory reference pertaining to position, course,
heading, bearing, speed, velocity, etc. and horizontal datum to different subsystems within an
integrated navigation system
3.1.3
compilation scale
scale with which the chart information meets the IHO requirements for chart accuracy. It is
established by the producing hydrographic office and encoded in the ENC
3.1.4
corrupted data
ENC data produced according to the S-57 ENC product specification, but altered or modified
during production, transmission, or retrieval
3.1.5
degrade
reduce the quantity or quality of information content

– 10 – 61174 © IEC:2001(E)
3.1.6
display redraw time
interval from when the display starts to change until the new display is complete

3.1.7
display regeneration time
interval from operator action until the consequent redraw is complete

3.1.8
display scale
ratio between a distance on the display and a distance on the ground, normalized and

expressed as, for example, 1:10 000

3.1.9
ENC cell
geographic division of ENC data for distributing purposes. For further information, refer to the
ENC product specification in S-57
3.1.10
ENC data
data conforming to 4.2.2
3.1.11
ENC test data set
standardized data set supplied on behalf of the IHO that is necessary to accomplish IEC
testing requirements for ECDIS. This data set is encoded according to the S-57 ENC product
specification and contains update information based on S-52, appendix 1. The specific
requirements are listed in annex F
3.1.12
non-ENC data
data not conforming to 4.2.2
3.1.13
overscale
display of the chart information at a display scale larger than the compilation scale.
Overscaling may arise from deliberate overscaling by the mariner, or from automatic
overscaling by ECDIS in compiling a display when the data included is at various scales
3.1.14
presentation library
implementation of the display specifications in S-52, appendix 2 “Colour and Symbol
Specifications for ECDIS”, by de-coding and symbolizing the SENC. It contains:
a) the ECDIS symbol library, including the IEC navigation symbols;

b) the ECDIS colour tables for day, dusk, and night viewing;
c) look-up tables, linking SENC objects to the appropriate colour and symbology;
d) conditional symbology procedures for:
– cases where symbolizing depends on circumstances, such as the mariner’s choice of
safety contour;
– cases where symbolizing is too complex to be defined in a direct look-up table;
e) description of symbology instructions;
f) mariner’s navigation objects, specified in the same format as chart objects for
convenience of processing in ECDIS;
g) supplementary features, for example ECDIS chart 1 colour differentiation test diagrams
and colour calibration software.

61174 © IEC:2001(E) – 11 –
The presentation library is available in hard-copy or in digital form. The symbols shall be
replicated in size and shape, using any convenient format. The colour tables shall be

reproduced within the tolerances given in S-52, appendix 2/5.2.3. The remaining items may

be implemented in any convenient form which produces the same results as the presentation

library.
3.1.15
single operator action
single operation shall be achieved by activating a hardkey or softkey, including any necessary

cursor movement
3.1.16
RNC data
data conforming to H.2.2
3.1.17
RNC test data set
standardized data set supplied on behalf of the IHO that is necessary to accomplish IEC
testing requirements for RCDS mode of operation. This data set is encoded according to the
S-61 RNC product specification. Test RNCs are specified by the HO providing the RNC
service or on whose behalf the RNC service is provided.
3.2 Abbreviations
AIS Automatic identification system
ARPA Automatic radar plotting aid
ATA Automatic tracking aid
CIE Comité International de l'Eclairage
EBL Electronic bearing line
ECDIS Electronic chart display and information system
ENC Electronic navigational chart
EPA Electronic plotting aid
EPFS Electronic position-fixing system
EUT Equipment under test
GMDSS Global maritime distress and safety system
HO Hydrographic office
IEC International Electrotechnical Commission
IHO International Hydrographic Organization

IMO International Maritime Organization
RCDS Raster chart display system
RNC Raster navigational chart
SENC System electronic navigational chart
SOLAS Safety of life at sea
SRNC System raster navigational chart
VRM Variable range marker
– 12 – 61174 © IEC:2001(E)
4 Minimum operational and performance requirements

4.1 Introduction
NOTE In the following subclauses of clause 4, the text in italics is from the corresponding paragraph of the annex
to IMO resolution A.817. For example, 4.1.1 is paragraph 1.1 from the annex of A.817.

4.1.1 The primary function of the ECDIS is to contribute to safe navigation.

4.1.2 ECDIS with adequate back-up arrangements may be accepted as complying with the

up-to-date charts required by regulation V/20 of the 1974 SOLAS Convention.
4.1.3 In addition to the general requirements for shipborne radio equipment forming part of
the global maritime distress and safety system (GMDSS) and the requirements for electronic
navigational aids contained in IMO resolution A.694 (IEC 60945), ECDIS shall meet the
requirements of IMO resolution A.817.
4.1.4 ECDIS shall be capable of displaying all chart information necessary for safe and
efficient navigation originated by, and distributed on the authority of, government authorized
hydrographic offices.
4.1.5 ECDIS shall facilitate simple and reliable updating of the electronic navigational chart.
4.1.6 Use of ECDIS shall reduce the navigational workload as compared to use of the paper
chart. It shall enable the mariner to execute in a convenient and timely manner all route
planning, route monitoring and positioning currently performed on paper charts. It shall be
capable of continuously plotting the ship's position.
4.1.7 ECDIS shall have at least the same reliability and availability of presentation as the
paper chart published by government authorized hydrographic offices.
4.1.8 ECDIS shall provide appropriate alarms or indications with respect to the information
displayed or malfunction of the equipment. (See annex D.)
4.1.9 When the relevant chart information is not available in the appropriate form, some
ECDIS equipment may operate in the Raster Chart Display System (RCDS) mode as defined
in annex H. Unless otherwise specified in annex H, the RCDS mode of operation shall
conform to performance standards not inferior to those set out in IMO resolution A.817.
4.2 ECDIS definitions
For the purpose of this standard:
4.2.1  Electronic chart display and information system (ECDIS) means a navigation
information system which with adequate backup arrangements can be accepted as complying
with the up-to-date chart required by regulation V/20 of the 1974 SOLAS Convention, by
displaying selected information from a system electronic navigational chart (SENC) with
positional information from navigation sensors to assist the mariner in route planning and
route monitoring, and by displaying additional navigation-related information.
The reference geodetic datum is WGS-84.

61174 © IEC:2001(E) – 13 –
4.2.2  Electronic navigational chart (ENC) means the database, standardized as to content,
structure and format, issued for use with ECDIS on the authority of government authorized

hydrographic offices. The ENC contains all the chart information necessary for safe navigation

and may contain supplementary information in addition to that contained in the paper chart

(e.g. sailing directions) which may be considered necessary for safe navigation.

The content, structure and format of the ENC are specified in S-57, including the associated

ENC product specification.
4.2.3  System electronic navigational chart (SENC) means a database resulting from the

transformation of the ENC by ECDIS for appropriate use, updates to the ENC by appropriate

means, and other data added by the mariner. It is this database that is actually accessed by
ECDIS for the display generation and other navigational functions, and is the equivalent of an
up-to-date paper chart. The SENC may also contain information from other sources.
4.2.4  Standard display means the SENC information that shall be shown when a chart is first
displayed on ECDIS. The level of the information it provides for route planning or route
monitoring may be modified by the mariner according to the mariner’s needs.
4.2.5  Display base means the level of SENC information which cannot be removed from the
display, consisting of information which is required at all times in all geographic areas and all
circumstances. It is not intended to be sufficient for safe navigation.
4.2.6  Further information on ECDIS definitions may be found in S-52, appendix 3.
4.3 Display of SENC information
4.3.1  ECDIS shall be capable of displaying all SENC information. (See 6.5.1 and 6.8.2 to
6.8.5.)
4.3.2  SENC information available for display during route planning and route monitoring
shall be subdivided into three categories, display base, standard display and all other
information. (See annex A.) (See 6.8.1 to 6.8.3.)
4.3.3  ECDIS shall present the standard display at any time by a single operator action.
(See 6.8.2.)
4.3.4  When a chart is first displayed on ECDIS, it shall provide the standard display at the
largest scale available in the SENC for the displayed area. (See 6.8.1.)
This is only applicable when the first chart is displayed subsequent to power up. The scale of

an ENC is indicated by its compilation scale.
4.3.5  It shall be easy to add or remove information from the ECDIS display. It shall not be
possible to remove information contained in the display base. (See 6.8.2.)
The addition or removal of information shall be limited to categories of information, for
example prohibited and restricted areas, spot soundings; not individual items, for example. an
individual area or an individual sounding. (See annex A, clauses 2 and 3.)
4.3.6  It shall be possible for the mariner to select a safety contour from the depth contours
provided by the SENC. ECDIS shall give the safety contour more emphasis than other
contours on the display. (See 6.8.8.)

– 14 – 61174 © IEC:2001(E)
4.3.7  It shall be possible for the mariner to select a safety depth. ECDIS shall emphasize
soundings equal to or less than the safety depth whenever spot soundings are selected for

display. (See 6.8.9.)
4.3.8  The ENC and all updates to it shall be displayed without any degradation of their

information content. (See 6.8.)

Degradation shall be understood as degradation in information quantity as well as quality with

respect to a standard test chart provided by government authorized hydrographic offices.

4.3.9  ECDIS shall provide a method of ensuring that the ENC and all updates to it have been

correctly loaded into the SENC. (See 6.8.15.2.)
4.3.10  The ENC data and updates to it shall be clearly distinguishable from other displayed
information, such as, for example, that listed in annex B. (See 6.8.5 and 6.8.15.2.)
Adherence to the IHO colours and symbols satisfies this requirement.
4.4 Provision and updating of chart information
(See S-52, appendix 1.)
4.4.1  The chart information to be used in ECDIS shall be the latest edition of information
originated by a government-authorized hydrographic office, and conform to IHO standards.
(See 6.5.)
In order to identify the date and origin of the ENC in use, the ECDIS shall include a graphical
index of ENC data available, presented upon the mariner’s request and providing access to
the edition and date of each cell. (See S-52 6.3(c).)
A new edition of an ENC will supersede a previous ENC and its integrated updates issued by
a government authorized hydrographic office.
4.4.2  The contents of the SENC shall be adequate and up to date for the intended voyage,
as required by regulation V/20 of the 1974 SOLAS Convention. (See 6.5.)
4.4.3  It shall not be possible to alter the contents of the ENC.
4.4.4  Updates shall be stored separately from the ENC. (See 6.8.15.2.)

Separate storage of updates may utilize the same data storage area.
4.4.5  ECDIS shall be capable of accepting official updates to the ENC data provided in
conformity with IHO standards. These updates shall be automatically applied to the SENC. By
whatever means updates are received, the implementation procedure shall not interfere with
the display in use.
The contents of an update assume that all earlier updates have been applied to the SENC. A
new edition of an ENC shall supersede a previous ENC and its updates.
4.4.6  ECDIS shall also be capable of accepting updates to the ENC data entered manually
with simple means for verification prior to the final acceptance of the data. They shall be
distinguishable on the display from ENC information and its official updates and not affect
display legibility. (See 6.8.5 and 6.8.16.)

61174 © IEC:2001(E) – 15 –
4.4.7  ECDIS shall keep a record of updates including time of application to the SENC (See
6.8.15.3.)
The record shall include updates for each ENC until it is superseded by a new edition.

4.4.8  ECDIS shall allow the mariner to display updates so that the mariner may review their
contents and ascertain that they have been included in the SENC. (See 6.8.15.2.)

4.5 Scale
ECDIS shall provide an indication if: (See 6.8.6.)

.1 the information is displayed at a larger scale than that contained in the ENC; or
.2 own ship's position is covered by an ENC at a larger scale than that provided by the
display.
4.6 Display of other navigational information
4.6.1  Radar information or other navigational information may be added to the ECDIS
display. However, it shall not degrade the SENC information, and shall be clearly distinguishable
from the SENC information. (See 6.8.3, 6.8.4 and 6.8.13.)
4.6.2  ECDIS and added navigational information shall use a common reference system. If
this is not the case, an indication shall be provided. (See 6.8.12 g).)
Such advice shall be included in the manufacturer’s installation handbook.
4.6.3  Radar and plotting information
4.6.3.1  Transferred radar information may contain both the radar image and ARPA or ATA or
EPA information. (See 6.2, 6.8.13.)
Where plotting information is added, it shall be indicated to the operator whether the vectors
are relative or true, and if true whether they are sea or ground stabilized.
4.6.3.2  If the radar image is added to the ECDIS display, the chart and the radar image shall
match in scale and in orientation. (See 6.8.13.)
Additionally the ECDIS and radar image shall match in projection.

4.6.3.3  The radar image and the position from the position sensor shall both be adjusted
automatically for antenna offset from the conning position. (See 6.8.13.)
4.6.3.4  It shall be possible to adjust the displayed position of the ship manually so that the
radar image matches the SENC display. (See 6.8.13.)
If an offset is applied, it shall be clearly indicated. The details of the offset shall be readily
available.
4.6.3.5  It shall be possible to remove the radar or plotting information by single operator
action. (See 6.8.13.)
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4.7 Display mode and generation of the neighbouring area

4.7.1  It shall always be possible to display the SENC in a 'north-up' orientation. Other

orientations are permitted. (See 6.8.7.)

4.7.2  ECDIS shall provide for true motion mode. Other modes are permitted. (See 6.8.7.)

4.7.3  When true motion mode is in use, reset and generation of the neighbouring area shall

take place automatically at a distance from the border of the display determined by the

mariner. (See 6.8.7.)
4.7.4  It shall be possible to manually change the chart area and the position of own ship
relative to the edge of the display. (See 6.8.7.)
4.8 Colours and symbols
4.8.1  IHO recommended colours and symbols shall be used to represent SENC information.
(See S-52, appendix 2.) (See 6.7.1.)
4.8.2  The colours and symbols other than those mentioned in 4.8.1 shall be those used to
describe the navigational elements and parameters listed in annex B and published in
annex E. (See 6.7.1.)
4.8.3  SENC information, when displayed at the scale specified in the ENC, shall use the
specified size of symbols, figures and letters. (See S-52, appendix 2.) (See 6.7.1.)
4.8.4  ECDIS shall allow the mariner to select whether own ship is displayed in true scale or
as a symbol. (See 6.7.1.)
4.9 Display requirements
4.9.1  ECDIS shall be capable of displaying information for: (See 6.9.2 and 6.9.3.)
.1 route planning and supplementary navigation tasks;
.2 route monitoring.
4.9.2  The effective size of the chart presentation for route monitoring shall be at least
270 mm by 270 mm. (See 6.7.5.)
4.9.3  The display shall be capable of complying with the colour and resolution
recommendations of IHO. (See S-52, appendix 2.) (See 6.7.3 and 6.7.4.)
4.9.4  The method of presentation shall ensure that the displayed information is clearly
visible to more than one observer in the conditions of light normally experienced on bridge of
the ship by day and by night. (See 6.7.5.)
4.10 Route planning, monitoring and voyage recording
4.10.1  It shall be possible to carry out route planning and route monitoring in a simple and
reliable manner. (See 6.9.2.)
4.10.2  ECDIS shall be designed following ergonomic principles for user-friendly operation.
(See 6.9.1.)
61174 © IEC:2001(E) – 17 –
4.10.3  The largest scale data available in the SENC for the area given shall always be used
by the ECDIS for all alarms or indications of crossing the ship's safety contour and of entering

a prohibited area, and for alarms and indications according to annex D. (See 6.9.3.)

4.10.4  Route planning
4.10.4.1  It shall be possible to carry out route planning including both straight and curved
segments. (See 6.9.2.)
4.10.4.2  It shall be possible to adjust a planned route by, for example: (See 6.9.2.)

.1 adding waypoints to a route;
.2 deleting waypoints from a route;
.3 changing the position of a waypoint;
.4 changing the order of the waypoints in the route.
4.10.4.3  It shall be possible to plan an alternate route in addit
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