ISO 19697:2016

Ships and marine technology — Navigation and ship operations — Electronic inclinometers

ISO 19697:2016 specifies the performance requirements, methods of testing and test results of electronic inclinometers required by the performance standard, IMO resolution MSC.363 (92), in addition to the general requirements contained in resolution A.694 (17) and is associated with IEC 60945. The electronic inclinometers provide information about actual heel angle, roll amplitude, roll period to support decision-making process on board in order to avoid dangerous situations, in stability (see Annex A for information), as well as to assist in maritime casualty investigation. The electronic inclinometers are mainly composed of a set of sensors, a signal processor, a display, an input device and an interface to other systems. It does not apply to the electronic inclinometers installed for purposes which are outside the scope of this document, e.g. monitoring of cargo status. Where a requirement in this document is different from IEC 60945, the requirement in this document takes precedence.

Navires et technologie maritime — Navigation et opérations maritimes — Inclinomètres électroniques

General Information

• Status: Published
• Publication Date: 07-Nov-2016
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: ISO/TC 8/SC 6 - Navigation and ship operations
• Drafting Committee: ISO/TC 8/SC 6/WG 9 - Indicators
• Current Stage: 9093 - International Standard confirmed

Relations

• Revises: ISO/PAS 19697:2014 - Ships and marine technology — Navigation and ship operations — Electronic inclinometers
• Effective Date: 05-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 19697
First edition
2016-11-15
Ships and marine technology —
Navigation and ship operations —
Electronic inclinometers
Navires et technologie maritime — Navigation et opérations
maritimes — Inclinomètres électroniques
Reference number
ISO 19697:2016(E)
©
ISO 2016

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ISO 19697:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ISO 19697:2016(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements . 3
4.1 General . 3
4.2 Functionality . 3
4.3 Information . 3
4.3.1 Actual heel angle and roll amplitude . 3
4.3.2 Roll period . 3
4.3.3 Roll peak hold value . 3
4.4 Display . 4
4.5 Alerts . 4
4.5.1 Operational alerts . 5
4.5.2 Functional alerts . 5
4.6 Interface . 6
4.7 Power supply . 6
5 Accuracy . 6
5.1 Actual heel angle, roll amplitude and roll period . 6
5.2 Acceleration condition . 6
6 Test methods and required results . 6
6.1 General . 6
6.2 Static actual heel angle test . 7
6.2.1 Method of testing and required results . 7
6.3 Dynamic actual heel angle test . 7
6.3.1 Method of testing and required results . 7
6.4 Long-term actual heel angle test . 7
6.4.1 Method of testing and required results . 7
6.5 Roll period test . 8
6.5.1 Method of testing and required results . 8
6.6 Connections to other equipment test . 8
6.6.1 Method of testing and required results . 8
6.7 Display test . 8
6.7.1 Method of testing and required results . 8
6.8 Operational alert test .10
6.8.1 Method of testing and required results .10
6.9 Functional alert test .11
6.9.1 Method of testing and required results .11
6.10 Roll peak hold value test .11
6.10.1 Method of testing and required results .11
6.11 Reset function of roll peak hold value test .11
6.11.1 Method of testing and required results .12
6.12 Power supply test .12
7 Installation position.12
8 Information .12
Annex A (informative) Relationship between transverse metacentric stability and
measured natural roll period of ships in waves .13
Annex B (informative) Test facility type test methodology .16
Annex C (informative) IEC 61162‑1 interface for VDR and other systems .17
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ISO 19697:2016(E)

Bibliography .19
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ISO 19697:2016(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee
SC 6, Navigation and ship operations.
This first edition cancels and replaces ISO/PAS 19697:2014.
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ISO 19697:2016(E)

Introduction
An electronic inclinometer is an electronic device that provides information about roll period, roll
amplitude and the heel angle of the ship. Electronic inclinometers are intended to support the decision-
making process on board in order to avoid dangerous situations, as well as assist in and facilitate maritime
casualty investigation. The requirements in this document take into account human factors, ergonomic
principles and advances in technology.
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INTERNATIONAL STANDARD ISO 19697:2016(E)
Ships and marine technology — Navigation and ship
operations — Electronic inclinometers
1 Scope
This document specifies the performance requirements, methods of testing and test results of electronic
inclinometers required by the performance standard, IMO resolution MSC.363 (92), in addition to the
general requirements contained in resolution A.694 (17) and is associated with IEC 60945.
The electronic inclinometers provide information about actual heel angle, roll amplitude, roll period
to support decision-making process on board in order to avoid dangerous situations, in stability
(see Annex A for information), as well as to assist in maritime casualty investigation. The electronic
inclinometers are mainly composed of a set of sensors, a signal processor, a display, an input device and
an interface to other systems.
It does not apply to the electronic inclinometers installed for purposes which are outside the scope of
this document, e.g. monitoring of cargo status.
Where a requirement in this document is different from IEC 60945, the requirement in this document
takes precedence.
NOTE All requirements that are extracted from the recommendations of IMO Resolution MSC.363 (92),
performance standards for electronic inclinometers, are printed in italics and the resolution and paragraph
numbers are indicated in brackets.
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 61924-2, Maritime navigation and radiocommunication equipment and systems — Integrated
navigation systems — Part 2: Modular structure for INS — Operational and performance requirements,
methods of testing and required test results
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
IMO resolution MSC.191 (79), Performance standard for the presentation of navigation-related information
on shipborne navigational displays
IMO resolution MSC.252 (83), Performance standards for Integrated Navigation Systems (INS)
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ISO 19697:2016(E)

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/
3.1
actual heel angle
momentary angle of roll referenced to a levelled ship to port or starboard side
[SOURCE: IMO MSC.363 (92), Par. 3.1]
3.2
analogue type display
display (3.3) that shows actual heel angle (3.1), roll amplitudes (3.7) and roll peak hold values (3.9) in a
continuous way, such as by means of an arrow pointer and graduated scale
3.3
digital type display
display (3.3) that shows actual heel angle (3.1), roll amplitudes (3.7) and roll peak hold values (3.9) in the
form of numbers
3.4
display
means by which the roll behaviour of the ship and the state of the electronic inclinometer system are
presented to an observer
3.5
inspection equipment
equipment for testing the performance of the electronic inclinometer
3.6
reset function for roll peak hold value
function for resetting roll peak hold values (3.9) to zero and for recording reset date (month, day and
year) and time
3.7
roll amplitude
maximum values of heel angle to port or starboard side
[SOURCE: IMO MSC.363 (92), Par. 3.1]
3.8
roll period
time between two successive maximum values of heel angle on the same side of the ship
[SOURCE: IMO MSC.363 (92), Par. 3.1]
3.9
roll peak hold value
maximum values of roll amplitude (3.7) to port or starboard side from the last reset
3.10
rolling
motion around the longitudinal axis of the ship
Note 1 to entry: Positive roll is starboard down.
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ISO 19697:2016(E)

[SOURCE: IMO MSC.363 (92), Par. 3.1]
3.11
zero crossing method
way for measuring wave period by using a zero crossing which is a point where the sign of a measured
value (roll angle) changes
EXAMPLE From positive to negative.
4 Requirements
4.1 General
Users of this document shall note that while attempting to implement the requirements, they shall
ensure compliance with such statutory requirements, rules and regulations so as to be applicable to the
individual ship concerned.
4.2 Functionality
[IMO MSC.363 (92) Par. 1.2] The electronic inclinometers shall in a reliable form
a) determine the actual heel angle with the required accuracy,
b) determine the roll amplitude with the required accuracy,
c) determine the roll period with the required accuracy,
d) present the information on a bridge display, and
e) provide a standardized interface to instantaneous heel angle to the voyage data recorder (VDR).
4.3 Information
4.3.1 Actual heel angle and roll amplitude
[IMO MSC.363 (92) Par. 4] Electronic inclinometers shall be capable of measuring the actual heel angle
and determining the amplitude of the rolling oscillation of the ship over a range of ±90°.
4.3.2 Roll period
[IMO MSC.363 (92) Par. 5] Electronic inclinometers shall be capable of measuring the time between the
maximum values of the rolling oscillation and determining the roll period over a minimum range of 4 s to 40 s.
If enough precision is not attained, the period may be measured by the “zero crossing method”.
4.3.3 Roll peak hold value
Electronic inclinometers may optionally record the roll peak hold values on both sides and present
them on any kind of display.
If optional recording of the roll peak hold values is provided, electronic inclinometers shall have a mean
of manually resetting the roll peak hold values by a single operator action.
If necessary, the following sentences may be provided for the reset of roll peak hold value:
$–TXT,01,01,01,EI_RPHVReset_yyyy_mm_dd_oo_nn_ss*hh < CR > < LF >   (see IEC 61162-1)
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where:
— “yyyy” is the reset year;
— “mm” is the reset month;
— “dd” is the reset day;
— “oo” is the reset hour;
— “nn” is the reset minute;
— “ss” is the reset second;
— “hh” is the check sum;
— TXT (see IEC 61162–1).
4.4 Display
[IMO MSC.363 (92) Par. 7.2] The actual heel angle to port or starboard shall be indicated in an analogue
form between the limits of ±45°. When the actual heel angle exceeds 45° to either side, the analogue
display is permitted to remain at 45°.
[IMO MSC.363 (92) Par. 7.1.2] Electronic inclinometers shall display the roll amplitude to both port and
starboard side with a minimum resolution of 1°.
Electronic inclinometers may optionally display the roll peak hold value for both sides, port and
starboard, with a minimum resolution of 1°. They may also optionally display its reset date/time or
relative time from the reset, if the roll peak hold value function is installed.
[IMO MSC.363 (92) Par. 7.1.1] Electronic inclinometers shall display the latest roll period with a minimum
resolution of 1 s.
[IMO MSC.363 (92) Par. 7.3] The display may be implemented as a dedicated display or integrated into
other bridge systems.
4.5 Alerts
Electronic inclinometer may provide operational alerts as described in 4.5.1 and shall provide
functional alerts as described in 4.5.2.
The alerts shall conform to protocol requirements of [IMO MSC.252 (83)] as specified in IEC 61924-2.
The presentation of alerts shall conform to the presentation requirements of [IMO MSC.191 (79)] as
specified in IEC 62288.
[IMO MSC.363 (92) Par. 10.2] Electronic inclinometers shall have a bidirectional interface to facilitate
communication, to transfer alerts from inclinometers to external systems, and to acknowledge and silence
alerts from external systems.
All alerts provided in the electronic inclinometer shall be output via alert communications interface.
The following sentences shall be provided for the alert communications interface.
Sentences transmitted by the electronic inclinometers:
— ALC and ALF (see IEC 61924-2).
Sentences received by the electronic inclinometers:
— ACN (see IEC 61924-2).
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When an Integrated Navigation System (INS) is fitted, a suitable interface shall be provided for CAM-
HMI with the Integrated Navigation System [IMO Res. MSC.252 (83) and IEC 61924-2].
4.5.1 Operational alerts
[IMO MSC.363 (92) Par. 8.2] Electronic inclinometers may optionally provide a warning for indicating that
a set heel angle had been exceeded.
The alert on heel angle excess shall be classified as CAT B Warning. The electronic inclinometer shall
have a method of manually setting the threshold value of heel angle excess. The warning is initiated
and its warning state becomes “active – unacknowledged”, when the measured heel angle exceeds the
threshold value of heel angle excess. The electronic inclinometer shall have the means to acknowledge
the alert on heel angle excess. If the alert is not acknowledged, it shall be repeated as warning within
5 min. Once the warning state becomes “active – acknowledged”, the warning state shall not be returned
to “normal” automatically regardless of the measured value. The electronic inclinometer shall have a
method of changing the alert state from “active – acknowledged” to “normal”.
ALF sentence is used to initiate a warning on other bridge systems when the actual heel angle exceeds
the pre-set threshold.
The following sentence may be provided for the input of a threshold value of heel angle excess:
$–TXT,01,01,01,EI_SetRollThresholdAngle_xx_deg *hh < CR > < LF >
and the sentence for transmitting the pre-set value of the threshold:
$–TXT,01,01,01,EI_RollThresholdAngle_xx_deg *hh < CR > < LF >
where:
— “xx” is the threshold value of heel angle;
— “hh” is the check sum;
— TXT (see IEC 61162–1).
Also, the following sentence may be provided for changing the alert state from “active acknowledged”
to “normal”:
$–TXT,01,01,01,EI_ChangeToNnormalState*hh < CR > < LF >
where:
— “hh” is check sum;
— TXT (see IEC 61162–1).
NOTE The usual alert handling may not be appropriate in this document. According to the usual alert
handling, a state of the warning “active acknowledged” becomes “normal” automatically when the measured
heel angle becomes lower than the threshold. However, the measured heel angle changing cyclically in starboard
side or port side causes frequent initiation of alerts because a state of warning “active acknowledged” becomes
“normal” just after acknowledged and the alert initiated again when the ship rolls to the other side and the
measured roll angle exceeds the threshold.
4.5.2 Functional alerts
[IMO MSC.363 (92) Par. 9.1] Electronic inclinometers shall internally check and indicate to the user if all
components are operative and if the information provided is valid or not.
All functional alerts should be classified as CAT.B Warning.
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ISO 19697:2016(E)

An alert shall be provided on the following conditions:
— malfunction of the electronic inclinometer sensor(s);
— failure of the power supply;
— heel angle data is invalid.
4.6 Interface
[IMO MSC.363 (92) Par. 10.1] Electronic inclinometers shall comprise a digital interface providing actual
heel angle information to other systems like, e.g. the voyage data recorder (VDR), with an update rate
of at least 5 Hz. Electronic inclinometers shall also comprise a digital interface providing the displayed
information of roll period and roll amplitude (see 4.3).
[IMO MSC.363 (92) Par. 10.3] The digital interface shall comply with the relevant International Standards
IEC 61162-2 as amended.
The sentence for transmitting the data to VDRs and other external systems is described in Annex C
provisionally.
4.7 Power supply
[IMO MSC.363 (92) Par. 12] Electronic inclinometers shall be powered from the ship’s main source of
electrical energy. In addition, it shall be possible to operate the electronic inclinometers from the ship’s
emergency source of electrical energy.
5 Accuracy
5.1 Actual heel angle, roll amplitude and roll period
[IMO MSC.363 (92) Par. 6.1] Electronic inclinometers shall provide the data with sufficient accuracy for a
proper assessment of the ships dynamic situation. Minimum accuracy of the measurements shall be 5 % of
reading or ±1°, whichever is the greater for angle measurements and 5 % of reading or ±1 s, whichever is the
greater for time measurements.
5.2 Acceleration condition
[IMO MSC.363 (92) Par. 6.2] Actual heel angle and time measurement accuracy shall not be unduly affected
by other linear or rotational movements of the ship (as e.g. surging, swaying, heaving, pitching, yawing) or
by transverse acceleration ranging from −0,8 g to +0,8 g.
The required acceleration condition, 0,8 g, includes the component of the gravitational acceleration.
6 Test methods and required results
6.1 General
Unless otherwise stated in this document, the requirements of IEC 60945 shall apply to the electronic
inclinometer. To ease the term, equipment under test (EUT) will be used to describe an electronic
inclinometer system being tested.
The test arrangement shall consist of the following:
— movable arm which enables rotation of the EUT sensor from the zero degree roll angle position
(upright) to the maximum roll angle position (90°) to both starboard and port sides;
— display representing other bridge equipment with which the EUT may communicate;
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— method of generating and transmitting to the EUT IEC 61162 sentences.
The EUT shall be arranged so that the heel sensors are secured to the moveable arm, the display is
readily observable and there is a suitable connection to permit the transmission and receipt of
IEC 61162 sentences between the EUT and the inspection equipment.
6.2 Static actual heel angle test
6.2.1 Method of testing and required results
To determine the actual heel angle of the electronic inclinometer statically, the EUT sensor is gradually
rotated from the zero degree to the maximum roll angle position on one side and then from zero to
maximum on the other side. Outputs of the EUT and the inspection equipment are recorded every 5° of
rotation.
Confirm that the difference between the angles recorded by the EUT and the inspection equipment
shall be within 5 %, or 1°, of the inspection equipment reading, whichever is the larger.
6.3 Dynamic actual heel angle test
6.3.1 Method of testing and required results
To determine the actual heel angle of the electronic inclinometer dynamically, the EUT sensor is
periodically rotated from the zero degree to the maximum roll angle position on one side and then
from zero to maximum on the other side. The inspection equipment shall also permit the addition of
the maximum expected transverse acceleration, 0,8 g, to the top of the arm (see Annex B for detailed
information on the inspection equipment). Before the test, manufacturers shall provide information on
the measurement delays in the EUT. Any measurement delay shall be less than 0,1 s.
The comparison of all measured heel angles between the EUT and the inspection equipment is
...