SIST EN IEC 62065:2026

SLOVENSKI STANDARD
01-marec-2026
Nadomešča:
SIST EN 62065:2014
Pomorska plovba ter radiokomunikacijski sistemi in oprema - Sistemi za nadzor
spremljanja - Obratovalne in zmogljivostne zahteve, preskusne metode in
zahtevani rezultati preskušanja (IEC 62065:2025)
Maritime navigation and radiocommunication equipment and systems - Track control
systems - Operational and performance requirements, test methods and required test
results (IEC 62065:2025)
Navigations- und Funkkommunikationsgeräte und -systeme für die Seeschifffahrt -
Bahnregelungssysteme - Betriebs- und Leistungsanforderungen, Prüfverfahren und
geforderte Prüfergebnisse (IEC 62065:2025)
Matériels et systèmes de navigation et de radiocommunication maritimes - Systèmes de
contrôle de route - Exigences opérationnelles et de fonctionnement, méthodes d'essai et
résultats exigibles (IEC 62065:2025)
Ta slovenski standard je istoveten z: EN IEC 62065:2025
ICS:
33.060.01 Radijske komunikacije na Radiocommunications in
splošno general
47.020.70 Navigacijska in krmilna Navigation and control
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62065

NORME EUROPÉENNE
EUROPÄISCHE NORM November 2025
ICS 47.020.70 Supersedes EN 62065:2014
English Version
Maritime navigation and radiocommunication equipment and
systems - Track control systems - Operational and performance
requirements, test methods and required test results
(IEC 62065:2025)
Matériels et systèmes de navigation et de Navigations- und Funkkommunikationsgeräte und -systeme
radiocommunication maritimes - Systèmes de contrôle de für die Seeschifffahrt - Bahnregelungssysteme - Betriebs-
route - Exigences opérationnelles et de fonctionnement, und Leistungsanforderungen, Prüfverfahren und geforderte
méthodes d'essai et résultats exigibles Prüfergebnisse
(IEC 62065:2025) (IEC 62065:2025)
This European Standard was approved by CENELEC on 2025-11-20. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62065:2025 E
European foreword
The text of document 80/1163/FDIS, future edition 3 of IEC 62065, prepared by TC 80 "Maritime
navigation and radiocommunication equipment and systems" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 62065:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-11-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-11-30
document have to be withdrawn
This document supersedes EN 62065:2014 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62065:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61023 NOTE Approved as EN 61023
IEC 61108 (series) NOTE Approved as EN IEC 61108 (series)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60945 - Maritime navigation and radiocommunication EN 60945 -
equipment and systems - General
requirements - Methods of testing and
required test results
IEC 61162-1 - Maritime navigation and radiocommunication EN IEC 61162-1 -
equipment and systems - Digital interfaces -
Part 1: Single talker and multiple listeners
IEC 61162-2 - Maritime navigation and radiocommunication EN IEC 61162-2 -
equipment and systems - Digital interfaces -
Part 2: Single talker and multiple listeners,
high-speed transmission
IEC 61162-450 - Maritime navigation and radiocommunication EN IEC 61162-450 -
equipment and systems - Digital interfaces -
Part 450: Multiple talkers and multiple
listeners - Ethernet interconnection
IEC 62288 - Maritime navigation and radiocommunication EN IEC 62288 -
equipment and systems - Presentation of
navigation-related information on shipborne
navigational displays - General
requirements, methods of testing and
required test results
IEC 62616 - Maritime navigation and radiocommunication EN 62616 -
equipment and systems - Bridge
navigational watch alarm system (BNWAS)
IEC 62923-1 - Maritime navigation and radiocommunication EN IEC 62923-1 -
equipment and systems – Bridge alert
management - Part 1: Operational and
performance requirements, methods of
testing and required test results
IEC 62923-2 - Maritime navigation and radiocommunication EN IEC 62923-2 -
equipment and systems – Bridge alert
management - Part 2: Alert and cluster
identifiers and other additional features

IEC 62065 ®
Edition 3.0 2025-10
INTERNATIONAL
STANDARD
Maritime navigation and radiocommunication equipment and systems - Track
control systems - Operational and performance requirements, test methods and
required test results
ICS 47.020.70  ISBN 978-2-8327-0768-5

IEC 62065:2025-10(en)
IEC 62065:2025 © IEC 2025
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms. 14
4 Application of this document . 15
5 Requirements . 15
5.1 General . 15
5.2 Operational requirements . 15
5.2.1 Functionality . 15
5.2.2 Accuracy and performance constraint documentation . 21
5.2.3 Alerts . 22
5.3 Ergonomic criteria. 26
5.3.1 Operational controls . 26
5.3.2 Presentation of information . 27
5.4 Interfacing . 28
5.4.1 Sensors . 28
5.4.2 Standards . 28
5.5 Fall-back arrangements . 29
5.5.1 General. 29
5.5.2 Failure of position . 30
5.5.3 Failure of the heading. 31
6 Test methods and required test results . 31
6.1 General . 31
6.1.1 General, safety and environmental tests . 31
6.1.2 Identification of the equipment under test . 31
6.1.3 Execution of operational tests . 32
6.2 Test setup . 33
6.2.1 General. 33
6.2.2 Ship motion simulator . 35
6.2.3 Test scenarios . 36
6.2.4 Preparing the EUT . 36
6.3 TCS mode, adaptation and turn performance . 36
6.3.1 Execute track control under undisturbed conditions . 36
6.3.2 Turn performance (~A) . 41
6.3.3 Adaptation. 41
6.3.4 Rudder activity . 44
6.4 Starting requirements . 45
6.4.1 Plausibility and correctness of geometric limits . 45
6.4.2 Ship's manoeuvrability . 45
6.4.3 Start track control on the pre-planned track . 45
6.5 Primary position, heading and speed and the use of faulty sensors . 47
6.6 Position monitoring . 47
6.7 Course change behaviour . 48
6.8 Change of waypoints . 49
IEC 62065:2025 © IEC 2025
6.9 Changing mode . 49
6.9.1 Manual change over from track control to manual steering . 49
6.9.2 Manual change over from track control to heading control . 49
6.10 Heading monitoring . 50
6.11 End of track . 50
6.12 Documentation . 51
6.13 Alerts . 51
6.13.1 General. 51
6.13.2 Power supply . 52
6.13.3 Cross track . 52
6.13.4 Course difference . 52
6.13.5 Low speed . 53
6.13.6 TC stopped . 53
6.14 Back-up navigator call . 53
6.15 Operational controls . 54
6.16 Presentation. 54
6.16.1 General. 54
6.16.2 Information to be presented . 54
6.17 Interfacing . 55
6.18 Sensor failure and fallback . 56
6.18.1 Sensor status failure . 56
6.18.2 Failure of track control . 56
6.18.3 Failure of position . 57
6.18.4 Failure of heading . 58
6.19 Control of pre-planned speed by TCS . 58
Annex A (informative) Graphical description of sequences . 59
Annex B (informative) Along-track speed control . 61
B.1 General . 61
B.2 Planning . 61
B.3 Execution – Commanded speed generation . 61
B.3.1 Required speed-of-advance . 61
B.3.2 Leg speed . 61
B.3.3 Operator-specified speed . 61
B.4 Execution – Propulsion control . 62
B.4.1 Open-loop propulsion control . 62
B.4.2 Closed-loop propulsion control . 62
B.5 Execution – Speed monitor . 62
B.6 Displays . 62
B.7 Failure and alerts. 62
B.7.1 Loss of speed sensor . 62
B.7.2 Speed not controlled . 62
B.7.3 Time profile infeasible . 62
B.7.4 Speed controller malfunction . 62
B.8 Change over controls and termination of automatic speed control . 63
Annex C (informative) Track control systems with dual controllers . 64
C.1 General . 64
C.2 Change over from active to back-up heading controller . 64
C.3 Change over from active to back-up track controller . 64
IEC 62065:2025 © IEC 2025
C.4 Failure of track control . 64
C.5 Failure of heading controller during track control . 64
Annex D (informative) Management of static and dynamic data . 65
D.1 General . 65
D.2 Management of geographic (chart) data . 65
D.3 Management of ships' data and reference parameters . 65
D.4 Management of track-related data (planning and control) . 65
D.5 Management of sensor data . 66
Annex E (informative) Limits . 67
Annex F (normative) Classification of alerts. 68
Annex G (normative) Scenario definitions and plots . 70
Annex H (informative) Sensor errors and noise models. 75
H.1 Simulation of position sensor errors . 75
H.2 Noise model for simulated position data . 75
H.3 Simulation of heading and speed information . 76
H.4 Simulation of sea state . 76
H.4.1 General. 76
H.4.2 Model description . 77
H.4.3 Model implementation . 78
Annex I (normative) Ship model specification . 81
I.1 General . 81
I.2 Overview – Background and requirements . 81
I.3 The model – Derivation . 81
I.3.1 General. 81
I.3.2 Thrust lever response model . 82
I.3.3 Rudder response model – Derivation . 84
I.3.4 Surge response model . 85
I.3.5 Sway response model . 86
I.3.6 Yaw response model . 88
I.3.7 Integration (deduced reckoning) . 90
I.4 Summary and block diagram . 92
I.4.1 Constant inputs. 92
I.4.2 Estimating parameters for a given vessel or class . 92
I.4.3 Run-time inputs . 93
I.4.4 Outputs . 94
I.4.5 Application of the model to system testing . 94
I.4.6 Testing system only, without rudder actuators . 96
I.4.7 Testing the whole system including actuation mechanism . 96
I.4.8 Model outputs: input to system under test . 97
I.5 Ship parameter sets . 97
I.6 Manoeuvring characteristics from turning circle manoeuvres (informative
example) . 98
Annex J (informative) Explanation of adaptation tests in 6.3.3 . 103
J.1 General . 103
J.2 Adaptation to speed change. 103
J.3 Adaptation to current changes along a leg . 104
J.4 Adaptation to current changes during turn . 104
J.5 Adaptation to sea state during turn . 105
IEC 62065:2025 © IEC 2025
J.6 Adaptation to sea state change on a leg . 105
Annex K (normative) IEC 61162 interfaces . 106
K.1 Required interfaces . 106
K.2 Use of ALR for BNWAS . 108
Bibliography . 109

Figure 1 – EUT typical configurations . 29
Figure 2 – Functional model of track control as part of an integrated navigation system . 32
Figure 3 – Typical logical block diagram for the interaction with the ship motion
simulator . 34
Figure 4 – High level block diagram . 35
Figure A.1 – Sequence of 'course change' alerts (~A) . 59
Figure A.2 – Handling of the back-up navigator call. 60
Figure G.1 – Scenario 1 plot . 70
Figure G.2 – Scenario 2 plot . 71
Figure G.3 – Scenario 3 plot . 72
Figure G.4 – Scenario 4 plot . 74
Figure H.1 – GPS error model . 75
Figure H.2 – Spectral distribution of modelled GPS errors . 76
Figure H.3 – Wave sequence – sea state 5 . 78
Figure H.4 – Wave spectrum – sea state 5 . 78
Figure H.5 – Supertanker – sea state 5 . 79
Figure H.6 – Container ship – sea state 5 . 79
Figure H.7 – Fast ferry – sea state 5 . 79
Figure H.8 – Container ship – sea state 2 . 80
Figure I.1 – High level model block diagram . 82
Figure I.2 – Model block diagram . 95
Figure I.3 – Application with simple follow-up . 96
Figure I.4 – Control system using actuator outputs and feedback . 96
Figure I.5 – System with actuator mechanism, bypassing the rudder response model . 97
Figure I.6 – System with actuator mechanism using a fast rudder response time in the
model . 97
Figure I.7 – Turning circle manoeuvre – Ferry . 100
Figure I.8 – Turning circle manoeuvre – Container ship . 101
Figure I.9 – Turning circle manoeuvre – Tanker . 102
Figure J.1 – Adaptation to speed change . 103
Figure J.2 – Adaptation to changes along a leg . 104
Figure J.3 – Adaptation to current changes during turn . 104
Figure J.4 – Adaptation to sea state during turn . 105
Figure J.5 – Adaptation to sea state change on a leg . 105
Figure K.1 – Track control system logical interfaces . 106

Table 1 – Simulator input rate . 35
Table 2 – Simulator output rate . 36
IEC 62065:2025 © IEC 2025
Table E.1 – Limits. 67
Table F.1 – Classification of alerts for track control systems . 68
Table G.1 – Scenario 1 . 70
Table G.2 – Scenario 2 . 71
Table G.3 – Scenario 3 . 72
Table G.4 – Scenario 4 . 73
Table H.1 – Permitted tolerances . 75
Table H.2 – Heights and periods for half-waves . 77
Table I.1 – Relationship between thrust lever and rudder models . 84
Table I.2 – Constant parameters of the model . 92
Table I.3 – Run-time inputs. 94
Table I.4 – Model outputs . 94
Table I.5 – Parameter sets for three ships . 98
Table I.6 – Results from turning circle manoeuvres . 99
Table K.1 – IEC 61162-1 sentences transmitted by the track control system . 107
Table K.2 – IEC 61162-1 sentences received by the track control system . 108

IEC 62065:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Maritime navigation and radiocommunication equipment and systems -
Track control systems -
Operational and performance requirements, test methods and required
test results
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 62065 has been prepared by IEC technical committee 80: Maritime navigation and
radiocommunication equipment and systems. It is an International Standard.
This third edition cancels and replaces the second edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alert management has been brought in line with MSC.302(87), IEC 62923-1 and
IEC 62923-2, reducing the number of alerts for one situation and improving the information
provided by alerts. An overview is provided in Annex F;
IEC 62065:2025 © IEC 2025
b) the previous Annex F has been removed as it was outdated and not instrumental in this
document;
c) the requirements in Clause 5 have been further detailed;
d) the structure of Clause 6 has been updated.
The text of this International Standard is based on the following documents:
Draft Report on voting
80/1163/FDIS 80/1168/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
NOTE The following print types are used in this document: all text of this document that is identical to that in IMO
resolution MSC.74(69), Annex 2, is printed in italics and the resolution (abbreviated to – A2) and paragraph numbers
are indicated in brackets i.e. (A2/3.3).
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 62065:2025 © IEC 2025
1 Scope
This document specifies the minimum operational and performance requirements, test methods
and required test results conforming to performance standards adopted by the IMO in resolution
MSC.74(69) Annex 2 Recommendation on Performance Standards for Track Control Systems.
In addition, it takes into account IMO resolution A.694(17) to which IEC 60945 is associated. It
also takes into account IMO resolution MSC.302(87) on bridge alert management (BAM), to
which IEC 62923-1 and IEC 62923-2 are associated.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60945, 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 61162-450, Maritime navigation and radiocommunication equipment and systems - Digital
interfaces - Part 450: Multiple talkers and multiple listeners - Ethernet interconnection
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 62616, Maritime navigation and radiocommunication equipment and systems - Bridge
navigational watch alarm system (BNWAS)
IEC 62923-1, Maritime navigation and radiocommunication equipment and systems - Bridge
alert management - Part 1: Operational and performance requirements, methods of testing and
required test results
IEC 62923-2, Maritime navigation and radiocommunication equipment and systems - Bridge
alert management - Part 2: Alert and cluster identifiers and other additional features
IEC 62065:2025 © IEC 2025
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
active track
track activated for track control
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.2
alarm
high-priority alert
condition requiring immediate attention and action by the bridge team, to maintain the safe
navigation and safe operation of the ship
[SOURCE: IMO Resolution MSC.302(87)]
3.1.3
alert
announcement of abnormal situations and conditions requiring attention
Note 1 to entry: Alerts are divided in four priorities: emergency alarms, alarms, warnings and cautions. An alert
provides information about a defined state change in connection with information about how to announce this event
in a defined way to the system and the operator.
[SOURCE: IMO Resolution MSC.302(87)]
3.1.4
assisted turn
manoeuvre of a ship automatically controlled by a pre-set radius or rate of turn, but not based
on the ship's position, to perform an approximation of a curved track
3.1.5
back-up navigator
any individual, generally an officer, who has been designated by the ships master to be on call
if assistance is needed on the bridge
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.6
back-up navigator call
BNC
signal automatically sent to the BNWAS to call assistance to the bridge
IEC 62065:2025 © IEC 2025
3.1.7
consistent common reference system
CCRS
sub-system or function for acquisition, processing, storage, surveillance and distribution of data
and information providing identical and obligatory reference to sub-systems and subsequent
functions and to other connected equipment, if available
3.1.8
CAM system
combined functionality of CAM and CAM-HMI
Note 1 to entry: CAM means the functionality for the management of the presentation of alerts on the CAM-HMI,
the communication of alert states between CAM-HMI and navigational systems and sensors
Note 2 to entry: CAM-HMI means the human machine interface for centralized presentation and handling of alerts
on the bridge
[SOURCE: IEC 62923-1:2018, 3.1.18, modified – Notes to entry added.]
3.1.9
course
horizontal direction in which a vessel is steered or intended to be steered, expressed as angular
distance from north, usually 000° at north, clockwise through 360°
Note 1 to entry: 360° is indicated as 000°.
3.1.10
course difference limit
maximum difference between track course and heading before a warning is activated
3.1.11
cross-track distance
XTD
perpendicular distance of the ship from the track
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.12
cross-track limit
maximum cross-track distance before an alarm is activated
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.13
curved track
non-straight track between two straight legs
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.14
FROM-waypoint
last passed waypoint
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
IEC 62065:2025 © IEC 2025
3.1.15
great circle
GC
intersection of a sphere on the earth and a plane through its centre
Note 1 to entry: Also called orthodrome.
[SOURCE: ISO 19018:2020, 10.2.9, modified - "also called orthodrome" moved from definition
to note to entry.]
3.1.16
heading
HDG
direction in which the bow of a ship is pointing expressed as an angular displacement from
north
[SOURCE: IMO Resolution MSC.191(79)]
3.1.17
heading control
control of the ship's heading
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.18
heading monitor function
monitoring of the actual heading sensor by an independent second source
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.19
leg
straight line between two waypoints and/or curved track(s)
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.20
main conning position
place on the bridge with a commanding view providing the necessary information and equipment
for the conning officer to carry out his functions
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.21
minimum manoeuvring speed for track control
lowest alongship speed through the water at which the track control system is capable of
maintaining its performance within the specified accuracy limits
Note 1 to entry: The value depends on the ship's design and loading and on the present environmental conditions.
3.1.22
NEXT-waypoint
waypoint following the TO-waypoint
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
IEC 62065:2025 © IEC 2025
3.1.23
override facility
control to perform the override function
[SOURCE: IMO Resolution MSC.74(69), Annex 2]
3.1.24
override function
intentional fast chang
...