IEC 62065:2002

INTERNATIONAL IEC
STANDARD
First edition
2002-03
Maritime navigation and radiocommunication
equipment and systems –
Track control systems –
Operational and performance requirements,
methods of testing and required test results
Reference number
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INTERNATIONAL IEC
STANDARD
First edition
2002-03
Maritime navigation and radiocommunication
equipment and systems –
Track control systems –
Operational and performance requirements,
methods of testing and required test results
 IEC 2002  Copyright - all rights reserved
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– 2 – 62065 © IEC:2002(E)
SOMMAIRE
FOREWORD.5
1 Scope.7
2 Normative references .7
3 Definitions and abbreviations.8
3.1 Definitions .8
3.2 Abbreviations .11
4 Requirements and application of this standard .12
4.1 Operational requirements .13
4.1.1 Functionality.13
4.1.2 Accuracy and performance constraint documentation .16
4.1.3 Alarms and indications .16
4.2 Ergonomic criteria .17
4.2.1 Operational controls .17
4.2.2 Presentation of information.18
4.3 Design and installation .19
4.4 Interfacing .19
4.4.1 Sensors .19
4.4.2 Status information .19
4.4.3 Standards.19
4.5 Fall-back arrangements.19
4.5.1 Failure of track control.19
4.5.2 Failure of position sensor .20
4.5.3 Failure of the heading measuring system.20
4.5.4 Failure of the speed sensor .20
5 Test requirements and results .21
5.1 General requirements.21
5.1.1 Environmental tests .21
5.1.2 Documentation .22
5.1.3 Declarations .23
5.2 Environment setup .23
5.2.1 Ship motion simulator .25
5.2.2 Test scenarios .26
5.2.3 Planning .26
5.3 Test execution.27
5.3.1 Check the track .27
5.3.2 Execution of the scenarios.28
5.3.3 Execution of additional tests .34
5.3.4 Monitoring and alarms .36
5.3.5 Fallback and manual change over .39
5.3.6 Display of information.41
5.3.7 Operational controls (4.2.1.1, 4.2.1.2) .42

62065 © IEC:2002(E) – 3 –
Annex A (normative) .43
Annex B (informative) Speed control.44
B.1 General .44
B.2 Planning .44
B.3 Execution – commanded speed generation.44
B.3.1 Required speed-of-advance.44
B.3.2 Leg speed .44
B.3.3 Operator-specified speed .45
B.4 Execution – propulsion control.45
B.4.1 Open-loop propulsion control.45
B.4.2 Closed-loop propulsion control .45
B.5 Execution – speed monitor .45
B.6 Displays .45
B.7 Failure and alarms.45
B.8 Changeover controls and termination of automatic speed control.45
Annex C (informative) Track control systems with dual heading controllers .46
C.1 Change over from active to back-up heading controller.46
C.2 Failure of track control.46
Annex D (informative) Management of static and dynamic data.47
D.1 Management of geographic (chart) data .47
D.2 Management of ships data and reference parameters.47
D.3 Management of track-related data (planning and control) .47
D.4 Management of sensor data .48
Annex E (informative) Limits .49
Annex F (informative) Data flow diagram .50
Annex G (normative) Scenario definitions and plots .51
Annex H (informative) Sensor errors and noise models.56
H.1 Simulation of position sensor errors.56
H.2 Simulation of heading and speed information.57
H.3 Simulation of sea state .58
Annex I (normative) Ship model specification.62
I.1 General .62
I.2 Definitions .62
I.3 Related documents.63
I.4 Introduction – background and requirements .64
I.5 The model – derivation .64
I.6 Summary and block diagram .73
I.7 Ship parameter sets .80
Annex J (informative) Explanation of adaptation tests (5.3.3.1).81
J.1 Adaptation to speed change .81

– 4 – 62065 © IEC:2002(E)
J.2 Adaptation to current changes along straight leg .81
J.3 Adaptation to current changes during turn .82
J.4 Adaptation to sea state during turn .82
J.5 Adaptation to sea state change on straight leg .83
Bibliography.84
Figure 1 – Functional model of track control as part of an integrated navigation system.22
Figure 2 – Block diagram .24
Figure 3 – High level block diagram .25
Figure A.1 – Sequence of course change indications and alarms (~A) .43
Figure G.1 – Scenario plot 1 .51
Figure G.2 – Scenario plot 2 .52
Figure G.3 – Scenario 3 plot .53
Figure G.4 – Scenario 4 plot .55
Figure H.1 – Spectral distribution of modelled GPS errors .57
Figure H.2 – Wave sequence – sea state 5 .59
Figure H.3 – Wave spectrum – sea state 5.60
Figure H.4 – Supertanker – sea state 5.60
Figure H.5 – Container ship – sea state 5 .61
Figure H.6 – Fast ferry – sea state 5.61
Figure H.7 – Container ship – sea state 2 .61
Figure I.1 – High level model block diagram.64
Figure I.2 – Model block diagram .77
Figure I.3 – Application with simple follow-up.78
Figure I.4 – Control system using actuator outputs and feedback.79
Figure I.5 – System with actuator mechanism, bypassing the rudder response model .79
Figure I.6 – System with actuator mechanism using a fast rudder response time
in the model.80
Figure J.1 – Adaptation to speed change .81
Figure J.2 – Adaptation to changes along straight leg .81
Figure J.3 – Adaptation to current changes during turn .82
Figure J.4 – Adaptation to sea state during turn.82
Figure J.5 – Adaptation to sea state change on straight leg .83
Table 1 – Simulator input rate .25
Table 2 – Simulator output rate.26
Table E.1 – Limits.49
Table G.1 – Scenario 1 .51
Table G.2 – Scenario 2 .52
Table G.3 – Scenario 3 .53
Table G.4 – Scenario 4 .54
Table H.1 – Histogram limits .57
Table H.2 – Heights and periods for half-waves .59
Table I.1 – Relationship between thrust lever and rudder models.66
Table I.2 – Constant parameters of the model.74
Table I.3 – Run-time inputs.75
Table I.4 – Model outputs .76
Table I.5 – Parameter sets for three ships .80

62065 © IEC:2002(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND
RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS –
TRACK CONTROL SYSTEMS –
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 62065 has been prepared by IEC technical committee 80: Maritime
navigation and radiocommunication equipment and systems. It was developed in cooperation
with ISO TC8 SC6.
The text of this standard is based on the following documents:
FDIS Report on voting
80/331/FDIS 80/339/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, G and I form an integral part of this standard.
Annexes B, C, D, E, F, H and J are for information only.

– 6 – 62065 © IEC:2002(E)
The committee has decided that the contents of this publication will remain unchanged until
2006. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62065 © IEC:2002(E) – 7 –
MARITIME NAVIGATION AND
RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS –
TRACK CONTROL SYSTEMS –
Operational and performance requirements,
methods of testing and required test results
1 Scope
This International Standard specifies the minimum operational and performance requirements,
methods of testing and required test results conforming to performance standards adopted by
the IMO in resolution MSC.74(69) Annex 2 Recommendations on Performance Standards for
Track Control Systems. In addition it takes into account IMO resolution A.694 to which
IEC 60945 is associated. When a requirement of this standard is different from IEC 60945,
the requirement in this standard shall take precedence.
NOTE All text of this standard 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).
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 61108-1, Global navigation satellite systems (GNSS) – Part 1: Global positioning system
(GPS) – Receiver equipment – Performance standards, methods of testing and required test
results
IEC 61108-2, Maritime navigation and radiocommunication equipment and systems – Global
navigation satellite systems (GNSS) – Part 2: Global navigation satellite system (GLONASS)
Receiver equipment – Performance standards, methods of testing and required test results
IEC 61162-1, Maritime navigation and radio communication equipment and systems – Digital
interfaces – Part 1: Single talker and multiple listeners
IEC 61162-2, Maritime navigation and radio communication equipment and systems – Digital
interfaces – Part 2: Single talker and multiple listeners, high speed transmission
ISO 9000, Quality management and quality assurance standards
IMO Resolution A.694(17), General requirements for shipborne radio equipment performing
part of the GMDSS and for electronic navigational aids
IMO Resolution A.830(19), Code on alarms and indicators
IMO MSC.74(69) Annex 2, Recommendations on performance standards for Track control
systems
– 8 – 62065 © IEC:2002(E)
3 Definitions and abbreviations
For the purposes of this standard, the following definitions and abbreviations apply.
3.1 Definitions
3.1.1
active track
track activated for track control
3.1.2
alarm
audio and visual signal announcing a condition requiring attention. The audio continues until
acknowledged. The acoustic noise pressure of the alarm is at least 75 dBA but not greater
than 85 dBA at a distance of 1 m (IEC 60945). The visual indication continues until the alarm
condition is removed
3.1.3
along track speed control
automatic control of the ship's speed during track control based on a pre-planned track
3.1.4
assisted turn
manoeuvre of a ship from one straight leg to the next automatically controlled by a pre-set
radius or rate of turn but not based on the ship's position
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
3.1.6
consistent 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 sub-systems within an
integrated navigation system
3.1.7
course
for marine navigation, course is the 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°.
3.1.8
course difference limit
maximum difference between track course and heading before an alarm is activated
3.1.9
cross track distance (also known as cross track error)
perpendicular distance of the ship from the track including direction (negative if the ship is left
of the intended track)
3.1.10
cross-track limit
maximum cross track distance before an alarm is activated
___________
360° is indicated as 000°.
62065 © IEC:2002(E) – 9 –
3.1.11
curved track
non-straight track between two straight legs
3.1.12
fall-back arrangements
automatic reaction of the system to a failure to provide the best possible functionality
3.1.13
FROM-waypoint
the last passed waypoint
3.1.14
great circle sailing
sailing on the intersection of the earth surface and a plane containing the points A, B and the
centre of the sphere
3.1.15
heading
the horizontal direction in which a ship actually points or heads at any instant, expressed in
angular units from a reference direction, usually from 000° at the reference direction
clockwise through 360°
3.1.16
heading control
control of the ship's heading
3.1.17
heading monitor function
Monitoring the actual heading sensor by an independent second source
3.1.18
indication
visual display of any message to the user which may be accompanied by a low intensity
acoustic signal to gain attention
3.1.19
leg
line between two waypoints defining the track
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
3.1.21
minimum manoeuvring speed for track control
lowest fore/aft speed through the water at which the track control system is capable of
maintaining its performance within the specified accuracy limits. The value depends on the
ship's design and loading and on the present environmental conditions
3.1.22
NEXT-waypoint
the waypoint following the TO-waypoint
___________
360° is indicated as 000°.
– 10 – 62065 © IEC:2002(E)
3.1.23
override facility
a control to perform the override function
3.1.24
override function
an intentional fast change-over from automatic to temporary manual control
3.1.25
position monitor function
monitoring the actual position sensor by an independent second source
3.1.26
primary position-fixing system
electronic position-fixing system (EPFS) used for track control and approved by the
International Maritime Organization (see 4.1.1.3)
3.1.27
radius of turn
radius of a curved track
3.1.28
rate of turn
change of heading per time unit
3.1.29
rhumb line sailing
sailing on a line on the surface of the earth making the same angle with each meridian
crossed
3.1.30
ship manoeuvring characteristics
these define the range-of-manoeuvre possible for the ship (for example, maximum turn rate,
minimum turn radius, maximum turn acceleration and deceleration)
3.1.31
single operator action
an action which is directly accessible and immediately effected, for example by:
– dedicated controls;
– primary access in an associated menu;
– alternative solutions which meet the functional requirements
3.1.32
speed
the absolute value of velocity. May either be the ship's speed through the water, or the speed
made good over the ground
3.1.33
steering mode selector
a switch provided for the selection of manual steering modes and automatic steering devices
3.1.34
temporary track
a track that originates at the current position of the ship and joins the pre-planned track. The
temporary track may include temporary waypoints which can be identified as different from the
waypoints of the pre-planned track

62065 © IEC:2002(E) – 11 –
3.1.35
TO-waypoint
the waypoint which the ship is approaching
3.1.36
track
path to be followed over ground
3.1.37
track control
control of the ship's movement along a track, where corrections made by the controller to
compensate for wind, drift and other influences, are based on the cross track error and not
only on the bearing to the destination waypoint (TO-waypoint)
3.1.38
track course
the direction from one waypoint to the next, a constant course on a rhumb line track and a
varying course on a Great Circle track
3.1.39
track planning
preplanning of a track including waypoint data and optionally speed data, commonly referred
to as passage planning or voyage planning
3.1.40
waypoint
a geographic position together with its associated data
3.1.41
wheel-over-line
the line, for example, perpendicular to the course line, where the ship has to initiate a curved
track to eliminate the effect of any offset with respect to the new course, taking into
consideration the distance required for the ship to build up the necessary turn rate
3.2 Abbreviations
~A Not applicable for category A systems
CCA Course change alarm
CCI Course change indication
DGPS Differential GPS
DR Dead reckoning
ECCI Early course change indication
ENC Electronic navigational chart
EPFS Electronic position fixing system
EUT Equipment under test
GC Great circle
GLONASS Russian Ministry of Defence global navigation satellite system
GPS Global positioning system
HSC High speed craft
INS Integrated navigation system
NA (Back up) Navigator alarm
RL Rhumb line
SDME Speed and distance measuring equipment
WOT Wheel-over time
– 12 – 62065 © IEC:2002(E)
4 Requirements and application of this standard
a) (A2/1) Track control systems in conjunction with their sources of position, heading and
speed information are intended to keep a ship automatically on a pre-planned track over
ground under various conditions and within the limits related to the ship's manoeuvrability.
A track control system may additionally include or be combined with
– heading control;
– along-track speed control (see annex B).
b) Planning the track by waypoints may be performed
– as part of the track control system, or
– by importing waypoint or track data.
c) This standard applies for track control systems which can exchange data with a heading
sensor, speed sensor, EPFS and/or heading controller but excludes waypoint data
exchange.
d) If a track control system automatically receives additional data, including waypoints, from
other navigational aids, the requirements of IEC 61924 for this data exchange shall also
apply.
e) If a track control system is integrated into an INS, the corresponding requirements of INS
(as defined in IEC 61924), for example concerning
– track planning by waypoints,
– data transfer of safety-checked waypoints and
– monitoring of navigational safety for example by charts
shall apply.
f) Track control does not necessarily require that ENC or other geographic data such as
shallow area information be taken into consideration by the track control system.
g) (A2/2.1) These IMO Performance Standards are applicable for track control systems
working
– at ship's speed from minimum manoeuvring speed up to 30 knots; and
– at ship's maximum rate of turn not greater than 10°/s.
h) These performance standards do not apply to HSC as defined by SOLAS chapter 10.
i) (A2/2.2) Track control systems fitted on ships shall meet all requirements of the IMO
Performance Standards (MSC.74(69) Annex 2 Recommendations on Performance
Standards for Track Control Systems) relating to straight tracks. Systems fitted on ships
requiring curved track control shall additionally meet all the requirements relating to
curved tracks.
j) This standard applies to three categories of track control systems:
Category A: Single straight leg track control or multiple straight leg track control
without assisted turns between legs;
Category B: Multiple straight leg track control with assisted turns between legs;
Category C: Full track control on straight legs and turns.
k) Some requirements contained in this clause cannot be verified by objective measure-
ments. The manufacturer shall declare that compliance to these requirements is achieved
and shall provide relevant documentation. The declaration(s), documentation and, where
necessary, the equipment shall be checked. The manufacturer shall also declare the
general hardware and functional composition of the equipment and the relevant category
of IEC 60945 for each unit.
62065 © IEC:2002(E) – 13 –
4.1 Operational requirements
4.1.1 Functionality
4.1.1.1 Track control steering modes
(A2/5.1.1) A track control system shall be able to steer the ship from its position
.1 to a single waypoint; or
.2 along a track containing a sequence of waypoints
using rhumb line or great circle sailing.
4.1.1.2 Starting requirements
(A2/5.1.2) The system shall allow the officer of the watch (user) to start or restart track
control only if
– the pre-planned track has been checked for plausibility and correctness of geometric and
ship dependent limits before becoming the active track
and if
– the ship's position relative to the selected track,
– the difference between track course and actual heading,
– the ship's manoeuvrability,
will result in a safe approach manoeuvre to the track. A safe approach manoeuvre is a
planned manoeuvre which is within the manoeuvring characteristics of the vessel and which
does not result in an unexpected turning direction.
For this purpose, the system shall allow the user at least one of the following options:
a) to select the TO-waypoint or a leg on a pre-planned track and to select the maximum
allowable difference between the bearing to the TO-waypoint and the actual heading; or
b) to define a temporary track to go to the pre-planned track. The temporary track shall meet
all ship manoeuvring characteristics which apply to a pre-planned track (~A) .
4.1.1.3 Primary position-fixing system
(A2/5.1.3) The primary position-fixing system used for track control shall be an electronic
position-fixing system (EPFS) approved by the International Maritime Organization.
4.1.1.4 Position monitoring
(A2/5.1.4) The ship's position shall be continuously monitored by a second or additional
independent position source. If the ship is fitted with a second EPFS and position is
available from this EPFS its position shall be used for position monitoring. Otherwise,
estimated position by dead reckoning (DR) as a minimum shall be used as the second
position source for position monitoring. The DR position shall be derived from a shipborne
heading sensor and a speed and distance measuring equipment (SDME). Means shall be
provided to adapt the acceptable deviation to the required steering accuracy. This monitoring
need not be an integral part of the track control system.
4.1.1.5 Early course change indication (~A)
A graphical description of the sequences described here is given in annex A.
___________
For example, a secondary GPS may be used to monitor a primary GPS.

– 14 – 62065 © IEC:2002(E)
(A2/5.1.5) In the case of track control by a sequence of waypoints, a confirmable 'early
course change indication' shall be given up to 5 min, and no later than 1 min, before the
wheel-over line.
The system shall provide means for the officer of the watch (user) to confirm the 'early course
change indication' before wheel-over.
4.1.1.6 Actual course change and confirmation (~A)
A graphical description of the sequences described here is given in annex A.
a) (A2/5.1.6.1) In the case of track control by a sequence of waypoints and if the 'early
course change indication' was confirmed a confirmable course change indication shall be
given at between 30 s to 1 min , at the earliest, before the wheel-over line.
If the 'early course change indication' has not been confirmed, a confirmable course
change alarm shall be given between 1 min and no later than 30 s before the wheel-
over line.
b) (A2/5.1.6.2) The system shall provide means for the officer of the watch (user) to confirm
or acknowledge the course change indication or course change alarm at or before wheel-
over.
c) (A2/5.1.6.3) With or without the confirmation, the ship shall follow automatically the track.
d) (A2/5.1.6.1) If the course change indication has not been confirmed by or at wheel-over
line then a course change alarm shall be given instead.
e) (A2/5.1.6.4) If the actual course change indication or the actual course change alarm is
not confirmed by the officer of the watch (user) within 30 s before or after the wheel-over
line, a back-up navigator alarm shall be given.
4.1.1.7 Change of waypoints
(A2/5.1.7) In the case of track control by a pre-planned sequence of waypoints, it shall not
be possible to modify the TO-waypoint, the FROM-waypoint and (~A) the NEXT-waypoint of
the active track and their relevant associated waypoint data while in the track control mode
without creating a new track and until:
a) the pre-planning of the new track is completed; and
b) the starting requirements (4.1.1.2) are fulfilled.
4.1.1.8 Turn performance (~A)
(A2/5.1.8) The track control shall enable the ship to sail from one leg to another by turns
based:
a) on a preset turn radius; or
b) on a radius calculated on the base of a preset rate of turn and the planned speed; and
within the turning capability of the ship.
4.1.1.9 Adaptation to steering characteristics
(A2/5.1.9) The track control shall be capable of manual or automatic adjustment to different
steering characteristics of the ship under various weather, speed and loading conditions.
___________
The preceding indication shall last at least 15 s before this indication is triggered.
The preceding indication shall last at least 15 s before this indication is triggered.

62065 © IEC:2002(E) – 15 –
4.1.1.10 Permitted tolerance
The quality of the track control shall be so that overshoot, oscillation and constant track
deviation are within tolerable limits both for straight and curved tracks.
(A2/5.1.10) Means shall be incorporated to prevent unnecessary activation of the rudder due to
normal yaw or sway motion, sensor data resolution and statistically scattered position errors.
For systems which include great circle sailing, the calculated great circle approximation of the
planned track shall not differ by more than 250 m from the mathematical calculation based on
geodetic solutions.
NOTE Appropriate solutions may be found in – T. Vincenty, Direct and inverse solutions of geodesics on the
ellipsoid, Survey Review No 176 April 1976 (pages 88-93) Published by: The Commonwealth Association of
Surveying and Land Economy, c/o Faculty of the “Built” Environment, University of West England, Cold Harbour
Lane, Bristol, BS16 1QY, UK.
4.1.1.11 Override function
(A2/5.1.11) A track control system shall be able to accept a signal from the override facilities
to terminate track control mode and switch to these override facilities. After change-over to
override, return to track control shall require user intervention (see 4.1.1.2).
4.1.1.12 Heading control mode
(A2/5.1.12) A track control system may be operated in heading control mode. In this case,
the performance standards of heading control systems are to be applied.
4.1.1.13 Manual change over from track control to manual steering
(A2/5.1.13.1) Change over from track control to manual steering shall be possible at any
rudder angle.
(A2/5.1.13.2) Change over from track control to manual steering shall be possible under any
conditions, including any failure in the track control system.
(A2/5.1.13.3) After change over to manual control, return to automatic control shall require
operator (user) intervention (see 5.3.5).
4.1.1.14 Manual change over from track control to heading control
This subclause only applies if the heading control is included in the track control system.
(A2/5.1.14.1) Any change over from track control to heading control shall be possible under
all conditions of normal operation.
(A2/5.1.14.2) To maintain the course, the heading control system shall
– if sailing on a straight leg, take over the actual heading as the preset heading,
– if sailing on a curved path, take over the actual heading as the preset heading.
Optionally, if sailing on a curved path, based on an intended operator selection, the heading
control system may take over the actual heading as the preset heading or complete the turn
with the track course of the next straight leg as the preset heading (~A). This selection shall
only be available after the turn has started and shall be clearly and unambiguously indicated.
(A2/5.1.14.3) Any switching back to track control shall require operator (user) intervention
(see 5.3.5).
– 16 – 62065 © IEC:2002(E)
4.1.1.15 Steering mode indication
(A2/5.1.15) Adequate indication shall be provided to show which method of steering is in
operation. The indication of the steering mode is not required to be an integral part of the
track control system, but shall be displayed at any work station of the track control system
where the steering mode can be affected.
4.1.1.16 Heading monitoring
(A2/5.1.16) Heading monitoring shall be provided to monitor the actual heading information
by independent heading sources. The heading monitor is not required to be an integral part of
the track control system.
4.1.1.17 End of track
a) At the end of the pre-planned track, an 'end of track alarm' shall be generated.
b) Until the user takes over, the system shall follow the track course of the final leg. As a
minimum, the system shall maintain the actual heading.
For category A systems, the 'end of track alarm' shall be given at the end of each leg.
4.1.2 Accuracy and performance constraint documentation
(A2/5.2.1) A short qualitative description of the effect of:
.1 the accuracy of the sensors for position, heading and speed;
.2 changes of course and speed;
.3 actual speed through the water; and
.4 environmental conditions
on the track control system shall be provided to the user in appropriate documentation.
4.1.3 Alarms and indications
All alarms and indications shall conform to the IMO code on alarms and indicators A.830(19).
In addition, indications may be accompanied by a short low intensity acoustic signal.
4.1.3.1 Failure or reduction in power supply
(A2/5.3.1) In case of failure or reduction of power supply to the track control system which
effects its safe operation, an alarm shall be given.
4.1.3.2 Position monitoring alarm
(A2/5.3.2) An alarm shall be given when the position monitor detects a deviation between
the primary and secondary position-fixing system beyond a preset limit.
4.1.3.3 Heading monitoring alarm
(A2/5.3.3) An alarm shall be given when the heading monitor detects a deviation beyond a
preset limit.
4.1.3.4 Failure and alarm status of sensor
(A2/5.3.4) In the case of any failure or alarm status received from the pos
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