IEC 61174:2008

IEC 61174
Edition 3.0 2008-09
INTERNATIONAL
STANDARD
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

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IEC 61174
Edition 3.0 2008-09
INTERNATIONAL
STANDARD
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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XE
ICS 47.020.70 ISBN 978-2-88910-432-1
– 2 – 61174 © IEC:2008(E)
CONTENTS
FOREWORD.6
1 Scope.8
2 Normative references .8
3 Terms, definitions and abbreviations .9
3.1 Definitions .10
3.2 Abbreviations .13
4 Minimum operational and performance requirements.13
4.1 General .13
4.2 ECDIS definitions .14
4.3 Display of SENC information .14
4.3.1 SENC .14
4.3.2 Warning indication.14
4.3.3 Categories of display.15
4.3.4 Safety contour .15
4.3.5 Safety depth .15
4.3.6 Information content.15
4.3.7 Verification and updates .15
4.3.8 Information about chart objects.16
4.3.9 Display scale .16
4.4 Provision and updating of chart information .16
4.4.1 Contents of the SENC .16
4.4.2 Updates.16
4.5 Scale.17
4.6 Display of other navigational information .17
4.6.1 Common reference system .17
4.6.2 Radar and plotting information.17
4.7 Display mode and generation of the neighbouring area .17
4.8 Colours and symbols .18
4.9 Display requirements.18
4.9.1 Route planning and monitoring .18
4.9.2 Chart presentation size.18
4.9.3 Colour and resolution .18
4.9.4 Presentation .18
4.9.5 Removal of information categories.19
4.10 Route planning, monitoring and voyage recording .19
4.10.1 General .19
4.10.2 Route planning .19
4.10.3 Route monitoring .19
4.10.4 Position integration.20
4.10.5 Object information .21
4.10.6 LOP position fix .21
4.10.7 Voyage recording .21
4.11 Calculations and accuracy.22
4.12 Connections with other equipment (interfaces) .22
4.13 Performance tests, malfunction alarms and indications.23
4.14 Back-up arrangements .23

61174 © IEC:2008(E) – 3 –
4.15 Power supply.23
4.16 Software maintenance.24
5 Requirements contained in IHO special publications.24
5.1 Content and structure of chart data .24
5.2 Priority of chart display.24
5.3 Display of chart information .25
5.3.1 Scale and navigation purpose.25
5.3.2 Text.25
5.3.3 Units and legend .26
5.4 Display functions .26
5.4.1 Object information .26
5.4.2 Navigational information .26
5.4.3 Safety contour .27
5.4.4 Navigational calculations .27
5.4.5 Date-dependant ENC objects .27
5.5 Supplementary display functions .28
5.5.1 Additional mariner’s information.28
5.5.2 Additional non-HO information.28
5.5.3 Tidal adjustment .28
5.6 Use of the presentation library.29
5.6.1 Presentation library .29
5.6.2 Test diagrams.29
5.7 Display characteristics .29
5.7.1 Display base.29
5.7.2 Navigators notes .29
5.8 Performance requirements .30
5.8.1 Redraw.30
5.8.2 Resolution .30
5.8.3 Symbols .30
5.8.4 Number of colours .30
5.8.5 Brightness and contrast .30
5.9 Ergonomic requirements.31
5.9.1 Mode and orientation.31
5.9.2 Windows.31
5.9.3 Mariner’s information panel .31
5.10 Update of chart information .31
5.10.1 General .31
5.10.2 Manual update .32
5.10.3 Semi-automatic update.33
5.10.4 Reception of updates .33
5.10.5 Sequence check.33
5.10.6 Consistency check .34
5.10.7 Geographic applicability .34
5.10.8 Summary report .34
5.10.9 Review of ENC updates.34
5.10.10 Modification of updates .34
6 Methods of testing and required test results .34
6.1 EUT installation, technical documentation, and test requirements.34
6.2 Interfaces .35

– 4 – 61174 © IEC:2008(E)
6.3 General requirements and presentation requirements.35
6.3.1 General requirements .35
6.3.2 Presentation requirements.35
6.4 Preparation .36
6.4.1 Power-up.36
6.4.2 Initial ship parameters .36
6.4.3 Required test items .36
6.5 Initial data tests.36
6.5.1 Presentation library .36
6.5.2 ENC .37
6.5.3 Encrypted ENC.37
6.6 Accuracy .38
6.7 Visual requirements.38
6.7.1 Symbols .38
6.7.2 Units and legend .38
6.7.3 Colour table.39
6.7.4 Resolution .39
6.7.5 Display characteristics.39
6.8 Functional requirements .39
6.8.1 Standard display.40
6.8.2 Display base.40
6.8.3 All other information .40
6.8.4 Display priorities.40
6.8.5 Additional display functions .40
6.8.6 Scale and navigation purpose.41
6.8.7 Mode and orientation.41
6.8.8 Safety contour .42
6.8.9 Safety depth .42
6.8.10 Object information .42
6.8.11 Navigation related functions .43
6.8.12 Position integration.43
6.8.13 Radar and plotting information.44
6.8.14 Loading of corrupted data.44
6.8.15 Automatic updates.45
6.8.16 Manual updates .46
6.8.17 Self-tests of major functions .46
6.9 Operational requirements .47
6.9.1 Ergonomic principles .47
6.9.2 Route planning .47
6.9.3 Route monitoring .48
6.9.4 Twelve-hour log.49
6.9.5 Voyage record .49
6.9.6 Power supply.50
6.9.7 LOP position fix .50
6.10 Software maintenance.50
Annex A (normative) SENC information to be displayed during route planning and
route monitoring.51
Annex B (normative) Navigational elements and parameters.52
Annex C (normative) Areas for which special conditions exist .53

61174 © IEC:2008(E) – 5 –
Annex D (normative) Alarms and indicators .54
Annex E (normative) ENC test data set.55
Annex F (normative) Back-up arrangements .58
Annex G (normative) ECDIS in the RCDS mode of operation .68
Annex H (normative) Alarms and indicators in the RCDS mode of operation .89
Annex I (normative) Scenario definitions and plots.90
Annex J (informative) Test requirements for encrypted ENC .94
Annex K (informative) Guidance for testing .97
Annex L (normative) Testing for colours and intensity .99
Annex M (informative) Elements of an electronic chart database . 102
Annex N (informative) Cross-references between IEC 61174 editions and
MSC.232(82) .107

Table 1 – Mandatory IEC 61162-1 sentences.23
Table 2 – Area, line and point objects .42
Table L.1 – Ambient light conditions .100

– 6 – 61174 © IEC:2008(E)
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 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 61174 has been prepared by IEC technical committee 80: Maritime
navigation and radiocommunication equipment and systems.
This third edition of IEC 61174 cancels and replaces the second edition published in 2001, of
which it constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
• this edition incorporates revised performance standards for ECDIS adopted by the IMO as
resolution MSC.232(82) in December 2006;
• the test methods have been updated accordingly and new tests added for encrypted ENC
data;
61174 © IEC:2008(E) – 7 –
• the revised IMO performance standards refer to performance standards for displays
adopted by the IMO as resolution MSC.191(79) and these have been incorporated by
reference to IEC 62288;
• Annex E of the previous edition which defined navigation symbols has been deleted as
this information is now in IEC 62288.
• five new annexes have been added.
IMO changed the order of the performance standards in MSC.232(82) compared with the
previous standards in resolution A.817(19). Annex N gives a cross-referencing of clause
numbering.
The text of this standard is based on the following documents:
FDIS Report on voting
80/535/FDIS 80/542/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.
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 publication may be issued at a later date.

– 8 – 61174 © IEC:2008(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 MSC.232(82).
This standard is based upon the performance standards of IMO resolution MSC.232(82), and
is also associated with IMO resolution A.694(17) and IEC 60945. Reference is made, where
appropriate, to IMO resolution MSC.232(82), and all subclauses whose wording is identical to
that in the resolution are printed in italics.
In association with the above IMO resolution MSC.232(82), are the International Hydrographic
Organization (IHO) special publications S-32, S-52, S-57, S-61, S-63 and S-64. 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.
(232/A2.1) These performance standards should apply to all ECDIS equipment carried on all
ships as follows:
– dedicated standalone workstation.
– a multifunction workstation as part of an INS.
(232/A2.2) These performance standards apply to ECDIS mode of operation, ECDIS in RCDS
mode of operation as specified in Annex G and ECDIS backup arrangements as specified in
Annex F.
(232/A2.3) Requirements for structure and format of the chart data, encryption of chart data
as well as the presentation of chart data are within the scope of relevant IHO standards, including those
listed in the normative references.
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 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, 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
61174 © IEC:2008(E) – 9 –
IEC 62288, Maritime navigation and radiocommunication equipment and systems –
Presentation of navigation-related information on shipborne navigational displays – General
requirements – Methods of testing and required test results
IEC 62388, Maritime navigation and radiocommunication equipment and systems – Shipborne
Radar – Performance requirements – Methods of testing and required test results
IMO International Convention for the safety of life at sea (SOLAS) 1974 (as amended)
IMO A.424(XI):1979, Performance standards for gyro-compasses
IMO A.694(17):1991, General requirements for shipborne radio equipment forming part of the
global maritime distress and safety system (GMDSS) and for electronic navigational aids
IMO A.821(19):1995, Performance standards for gyro-compasses for high-speed craft
IMO A.823(19):1995, Performance standards for automatic radar plotting aids
IMO A.824(19):1995, Performance standards for devices to indicate speed and distance
IMO A.830(19):1995, Code on Alarms and Indicators
IMO MSC.191(79), Performance standards for the presentation of navigation-related
information on shipborne navigational displays
IMO MSC.192(79), Revised performance standards for radar equipment
IMO MSC.232(82):2006, Revised Performance standards for electronic chart display and
information systems (ECDIS)
IMO MSC/Circ.982 (2000), Guidelines on ergonomic criteria for bridge equipment and layout
IMO SN/Circ.243 (2004), Guidelines for the Presentation of Navigation-related Symbols,
Terms and Abbreviations
IMO SN.1/Circ.266 (2007), Maintenance of electronic chart display and information system
(ECDIS) software
IHO M-3:2007, Resolutions of the IHO, Chapter A, Section 3, Technical Resolution 3.11
IHO S-32, appendix 1, Hydrographic dictionary – Glossary of ECDIS related terms
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 2:2004 Colour and symbol specifications for ECDIS
IHO S-57, appendix B.1: 2000, ENC product specification
IHO S-61:1999, Product specification for raster navigational charts (RNC)
IHO S-63:2008, IHO data protection scheme
IHO S-64, Test data sets for ECDIS
3 Terms, definitions and abbreviations
For the purposes of this document, the following terms, definitions and abbreviations apply.

– 10 – 61174 © IEC:2008(E)
3.1 Definitions
3.1.1
appropriate portfolio of up to date paper charts
(APC)
(232/App.7 3.7) a suite of paper charts of a scale to show sufficient detail of topography,
depths, navigational hazards, aids to navigation, charted routes, and routeing measures to
provide the mariner with information on the overall navigational environment. The APC should
provide adequate look-ahead capability. Coastal States will provide details of the charts which
meet the requirement of this portfolio, and these details are included in a worldwide database
maintained by the IHO. Consideration should be given to the details contained in this
database when determining the content of the APC
3.1.2
CIE colour calibration
procedure to confirm that the colour specified in S-52, appendix 2 is correctly reproduced on
the ECDIS display
3.1.3
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
3.1.4
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
3.1.5
corrupted data
ENC data produced according to the S-57 ENC product specification, but altered or modified
during production, transmission, or retrieval
3.1.6
dead-reckoned position
DR
position extrapolated from the last accepted position update, based on present course and
speed, and updated on a time interval selected by the operator
3.1.7
degrade
reduce the quantity or quality of information content
3.1.8
display base
(232/A3.5) the chart content as listed in Annex A and which cannot be removed from the
display. It is not intended to be sufficient for safe navigation
3.1.9
display redraw time
interval from when the display starts to change until the new display is complete
3.1.10
display regeneration time
interval from operator action until the consequent redraw is complete

61174 © IEC:2008(E) – 11 –
3.1.11
display scale
ratio between a distance on the display and a distance on the ground, normalized and
expressed as, for example 1:10 000
3.1.12
electronic chart display and information system
(ECDIS)
(232/A3.1) a navigation information system which with adequate backup arrangements can be
accepted as complying with the up-to-date chart required by regulation V/19 and V/27 of the
1974 SOLAS Convention, as amended, 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 if required display additional
navigation-related information
3.1.13
electronic navigation chart
(ENC)
(232/A3.2) the database, standardized as to content, structure and format, issued for use with
ECDIS by or on the authority of a Government authorized Hydrographic Office or other
relevant government institution, and conform to IHO standards. 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 (for example sailing directions) which may be
considered necessary for safe navigation
3.1.14
ENC cell
geographic division of ENC data for distributing purposes. For further information, refer to the
ENC product specification in S-57
3.1.15
ENC data
data conforming to 3.1.13
3.1.16
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 E
3.1.17
estimated position
(EP)
position of own ship determined by the common intersection of two LOPs
3.1.18
fix
position of own ship determined, without reference to any former position, by the common
intersection of three or more LOPs
3.1.19
line of position
(LOP)
plotted line on which own ship is located determined by observation or measurement of the
range or bearing to an aid to navigation or other charted element

– 12 – 61174 © IEC:2008(E)
3.1.20
non-ENC data
data not conforming to 3.1.13
3.1.21
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
3.1.22
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 for chart features;
b) the ECDIS colour tables for day, dusk, and night viewing;
c) look-up tables, linking ENC 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, date or time;
– cases where symbolizing is too complex to be defined in a direct look-up table;
e) description of symbology instructions;
f) supplementary features, for example ECDIS chart 1 colour differentiation test diagrams
and colour calibration software
3.1.23
raster chart display system
(RCDS)
(232/App.7 3.1) a navigation information system displaying RNCs with positional information
from navigation sensors to assist the mariner in route planning and route monitoring and, if
required, display additional navigation-related information
3.1.24
raster navigational chart
(RNC)
(232/App.7 3.2) a facsimile of a paper chart originated by, or distributed on the authority of, a
government-authorized hydrographic office. RNC is used in these standards to mean either a
single chart or a collection of charts
3.1.25
RNC data
data conforming to 3.1.24
3.1.26
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
3.1.27
single operator action
single operation shall be achieved by activating a hardkey or softkey, including any necessary
cursor movement
61174 © IEC:2008(E) – 13 –
3.1.28
standard display
(232/A3.4) the display mode intended to be used as a minimum during route planning and
route monitoring. The chart content is listed in Annex A
3.1.29
system electronic navigational chart
(SENC)
(232/A3.3) a database in the manufacturer’s internal ECDIS format, resulting from the
lossless transformation of the entire ENC contents and updates. 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 added
by the mariner and information from other sources
3.1.30
system raster navigational chart database
(SRNC)
(232/App.7 3.3) a database resulting from the transformation of the RNC by the RCDS to
include updates to the RNC by appropriate means
3.2 Abbreviations
AIS Automatic identification system
ARPA Automatic radar plotting aid
CIE Comité International de l'Eclairage
DR Dead-reckoned
EBL Electronic bearing line
EP Estimated position
EPFS Electronic position-fixing system
EUT Equipment under test
GMDSS Global maritime distress and safety system
HO Hydrographic office
IHO International Hydrographic Organization
IMO International Maritime Organization
SOLAS Safety of life at sea
VRM Variable range marker
4 Minimum operational and performance requirements
4.1 General
(232/A1.1) The primary function of the ECDIS is to contribute to safe navigation.
(232/A1.2) ECDIS with adequate back-up arrangements may be accepted as complying with
the up-to-date charts required by regulations V/19 and V/27 of the 1974 SOLAS Convention,
as amended. (See Annex F.)
(232/A2.4) In addition to the general requirements set out in resolution A.694(17) as further
specified in IEC 60945 and the presentation requirements set out in resolution MSC.191(79)
as further specified in IEC 62288, ECDIS equipment shall meet the requirements of
MSC.232(82) and follow the relevant guidelines on ergonomic principles adopted by the IMO
in MSC/Circ.982. (See 5.3, 6.3, 6.9.1.).

– 14 – 61174 © IEC:2008(E)
(232/A1.3) 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. (See 4.3, Clause 5.)
(232/A1.4) ECDIS shall facilitate simple and reliable updating of the electronic navigational
chart. (See 4.4, 5.10)
(232/A1.5) ECDIS shall reduce the navigational workload compared to using 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. (See 4.10.)
(232/A1.7) ECDIS shall have at least the same reliability and availability of presentation as
the paper chart published by government authorized hydrographic offices. (See 4.3, 4.8, 4.9,
Clause 5.)
(232/A1.8) ECDIS shall provide appropriate alarms or indications with respect to the
information displayed or malfunction of the equipment. (See Annex D.)
(232/A1.9) When the relevant chart information is not available in the appropriate form, (See
4.4) some ECDIS equipment may operate in the Raster Chart Display System (RCDS) mode
as defined in Annex G. The RCDS mode of operation shall conform to performance standards
not inferior to those set out in Annex G.
(232/A1.6) The ECDIS display may also be used for the display of radar, radar tracked target
information, AIS and other appropriate data layers to assist in route monitoring in accordance
with requirements of 232/A2.4, 232/A7.4, and 232/A9.2, as further specified herein. (See 4.6,
4.8, 4.12.)
4.2 ECDIS definitions
(232/A3.6) Further information on ECDIS definitions may be found in IHO S-32.
4.3 Display of SENC information
4.3.1 SENC
(232/A5.1a) ECDIS shall be capable of displaying all SENC information. An ECDIS shall be
capable of accepting and converting an ENC and its updates into a SENC. (See 5.1 and Annex E.)
(232/A5.1b) The ECDIS may also be capable of accepting a SENC resulting from conversion
of ENC to SENC ashore, in accordance with IHO Technical Resolution A3.11 (IHO Miscellaneous
Publication M-3). This method of ENC supply is known as SENC delivery.
NOTE In addition to S-57 format, Governments, government-authorized Hydrographic Offices or other relevant
government institutions may allow the distribution of HO data (ENC) for their waters in a SENC format, in
accordance with IHO M-3 Technical Resolution A3.11. This requires distributors of HO data (ENC) in SENC format
to obtain approval from the issuing authority and to operate under the regulations of that authority. (Refer to IHO
M-3, TR A3.11.2 and A3.11.2.3.)
For ENC data delivered in SENC format, the chart update mechanism provided by the ECDIS
shall not be inferior to the ENC update mechanism. (See 4.4.)
4.3.2 Warning indication
(See 6.5.2 a).)
If SENC data from a private source is in use, warning indication shall be provided.

61174 © IEC:2008(E) – 15 –
4.3.3 Categories of display
(See 6.8.1 to 6.8.3.)
(232/A5.2) SENC information available for display during route planning and route monitoring
shall be subdivided into the following three categories, Display base, Standard display and All
Other Information. (See Annex A.)
(232/A5.3) ECDIS shall present the Standard Display at any time by a single operator action.
(232/A5.4) When an ECDIS is switched on following a switch off or power failure, it shall
return to the most recently manually selected settings for the display.
(232/A5.5) It shall be easy
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