ISO 11606:2022

INTERNATIONAL ISO
STANDARD 11606
Third edition
2022-02
Ships and marine technology —
Marine electromagnetic compasses
Navires et technologie maritime — Compas électromagnétiques de
marine
Reference number
ISO 11606:2022(E)
© ISO 2022

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ISO 11606:2022(E)
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© ISO 2022
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Published in Switzerland
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ISO 11606:2022(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Composition . 2
5 Construction and material . 2
5.1 Requirements . 2
5.2 Electrical wiring . 2
5.3 Non-magnetic housing . 2
5.4 Fore-and-aft marks . 2
5.5 Graduation . 2
5.5.1 Graduation of main compass card . 2
5.5.2 Indication of the repeater indicator . 3
5.5.3 Centre of the graduation. 3
5.5.4 Graduation of the verge ring . 3
5.5.5 Accuracy of fore-and-aft marks . 3
5.5.6 Readability of the graduation . 3
5.5.7 Horizontal position of the compass plane . 3
5.6 Lubber marks . 3
5.6.1 General . 3
5.6.2 Accuracy . 3
5.7 Illumination . 4
5.8 Compensation of deviation and heeling error . 4
5.8.1 General . 4
5.8.2 Indication of compensation . 4
5.8.3 Protection of compensation . 4
5.9 Heading output . 4
5.10 Outputs to other equipment . 4
5.11 Gimbals . 5
5.11.1 Direction of gimbal axes . 5
5.11.2 Angle between the gimbal axes . 5
5.11.3 Freedom of tilt of the main compass . 5
5.11.4 Precaution against dislodging of the main compass and the repeater
indicators . 5
5.12 Fitting the main compass . 5
5.13 Height of the compass card plane . 5
5.14 Watertightness of repeater indicators . 5
5.15 Azimuth reading devices . 5
5.15.1 Provision of azimuth reading devices . 5
5.15.2 Azimuth sight . 5
5.16 Construction for maintenance and inspection . 5
5.17 Protection against changes in power supply . 6
6 Performance . 6
6.1 Preconditions . 6
6.2 Accuracy of heading . 6
6.2.1 Static accuracy . 6
6.2.2 Dynamic accuracy . 6
6.3 Follow-up accuracy of the transmission system . 6
6.4 Synchronized accuracy between a repeater indicator and the main compass . 6
6.5 Possibility of compensating the coefficients . 6
6.6 Electromagnetic compatibility. 6
7 Precautions against failure . 7
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ISO 11606:2022(E)
7.1 Power supply . 7
7.2 Backup of compensator data . 7
7.3 Failure alarm . 7
8 Marking . . 7
9 Type testing and individual testing . 7
9.1 General . 7
9.2 Type testing . 7
9.3 Individual testing . 7
10 Certification . 8
10.1 Test certification . 8
10.2 Statement issued by or on behalf of the manufacturer . 8
10.3 Marking check . 8
10.4 Sample checks . 8
11 Testing. 8
11.1 Testing of units . 8
11.1.1 General . 8
11.1.2 Condition of the compass . 9
11.1.3 Non-magnetic properties (type test only) . 9
11.1.4 Graduation of the main compass card . 9
11.1.5 Fore-and-aft marks of the main compass. 9
11.1.6 Azimuth error of the main compass . 9
11.1.7 Graduation of the card of card-type repeater indicators . 9
11.1.8 Graduation of the verge ring . 9
11.1.9 Readability . 9
11.1.10 Horizontal position of compass plane . 9
11.1.11 Lubber marks . 10
11.1.12 Illumination and dimmer systems . 10
11.1.13 Indication of compensation values . 10
11.1.14 Examination of the output . 10
11.1.15 Direction of gimbal axis and angle between the gimbal axes . 10
11.1.16 Freedom of tilt of the main compass . 11
11.1.17 Precautions against dislodging . 11
11.1.18 Fitting the main compass . 11
11.1.19 Height of the main compass card plane . 11
11.1.20 Watertightness of repeater indicators . 11
11.1.21 Provision of azimuth reading device . 11
11.1.22 Azimuth sight . 11
11.1.23 Construction for maintenance and inspection. 11
11.1.24 Protection against changes in power supply . 11
11.2 Performance tests . 11
11.2.1 Freedom of tilt of the compasses . 11
11.2.2 Accuracy of the fore-and-aft marks of the main compass .12
11.2.3 Accuracy of the main lubber mark .12
11.2.4 Accuracy of the compass .12
11.2.5 Directional error in the horizontal plane .12
11.2.6 Bearing accuracy under the influence of ship's motion .12
11.2.7 Transmission system .12
11.2.8 Synchronized accuracy between a repeater indicator and the main compass .12
11.2.9 Environmental conditions .12
11.2.10 Test of compensation ability .12
11.3 Test of electromagnetic compatibility . 13
11.4 Checking of precaution against failure . 13
12 Designation .13
Bibliography .14
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ISO 11606:2022(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 of the voluntary nature of standards, 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
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 6, Navigation and ship operations.
This third edition cancels and replaces the second edition (ISO 11606:2000), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 11606:2000/Cor 1:2005.
The main changes are as follows:
— in Clause 1, added text relating to IMO Resolution MSC.166(78) and the applicability of this document;
— in Clause 2, replaced ISO 449:1997 with ISO 25862:2019, and deleted IEC 61162-1, IEC 61162-2 and
IMO Resolution MSC.86(70);
— in Clause 3, added term electromagnetic compass (3.1);
— in 5.7 and 11.1.12, added a provision on displays for presentation and a reference to IEC 62288;
— in 5.10, updated interface requirements;
— in 7.3, updated failure alarm requirements;
— in 11.2.9, updated other environmental conditions requirements;
— deleted former Annex A;
— in the Bibliography, added ISO 22090-2, IEC 61162-1, IEC 61162-2, IEC 61162-450, IEC 62288,
IEC 62923-1, IEC 62923-2, IMO Resolution MSC.86(70), IMO Resolution MSC.166(78), IMO Resolution
MSC.191(79), IMO Resolution MSC.302(87) and IMO Resolution MSC.466(101).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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INTERNATIONAL STANDARD ISO 11606:2022(E)
Ships and marine technology — Marine electromagnetic
compasses
1 Scope
This document specifies general requirements, type tests and individual tests for the marine
electromagnetic compasses, intended for steering purposes and/or taking bearings on board ships,
required by Chapter V of SOLAS, 1974 and the International Code of Safety for High-Speed Craft
(HSC Code). In accordance with IMO Resolution MSC.166(78), this document is applicable to marine
electromagnetic compasses fitted before 1 July 2002. For marine electromagnetic compasses installed
on or after 1 July 2002, ISO 22090-2 is applicable. The magnetic compasses specified in this document
apply to ships the overall length of which is normally not less than 24 m.
NOTE In this document requirements extracted from the recommendations of IMO resolutions are printed
in italics.
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.
ISO 1069, Magnetic compasses and binnacles for sea navigation — Vocabulary
ISO 25862:2019, Ships and marine technology — Marine magnetic compasses, binnacles and azimuth
reading devices
IEC 60945, Marine navigation and radiocommunication equipment and systems — General requirements
— Methods of testing and required test results
IMO Resolution A. 694(17), General requirements for shipborne radio equipment forming part of the global
maritime distress and safety system (GMDSS) and for electronic navigational aids
IMO Resolution A. 813(19), General requirements for electromagnetic compatibility (EMC) for all electrical
and electronic ship’s equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1069 and the following apply
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
electromagnetic compass
item of the electronic equipment that uses the geomagnetic field to obtain information about the ship's
heading
Note 1 to entry: This information is conveyed to the main compass (used for steering and taking bearings), to
additional repeater indicators and, if required, to other navigational equipment.
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ISO 11606:2022(E)
3.2
magnetic sensor
sensor that detects geomagnetic field and supplies appropriate output concerning direction to the
processor (3.4)
3.3
main compass
display unit that shows the output of the processor (3.4) with a compass card or an electronic image of
a compass card
3.4
processor
device that processes the output of the magnetic sensor (3.2) and provides the ship's magnetic heading
and/or true heading
3.5
repeater indicator
additional indicator that may be equipped with a display that uses a different type of compass card
4 Composition
The electromagnetic compass system shall consist of a magnetic sensor, a processor, a main compass
display and facilities for other repeater indicators and equipment.
5 Construction and material
5.1 Requirements
Electromagnetic compasses shall fulfil the requirements in 5.2 to 5.17.
5.2 Electrical wiring
Electrical wiring, such as that for the direct-current power supply and that for connecting the units,
shall not produce any perceptible errors in the heading information.
Twist cables are recommended for this purpose.
5.3 Non-magnetic housing
The housing of the magnetic sensor system shall be non-magnetic.
5.4 Fore-and-aft marks
[IMO Resolution MSC.86(70), Annex 2, 4.1.1] Fore-and-aft marks shall be inscribed on the housing of the
magnetic sensor system and the bottom part of the binnacle of the main compass. The units shall be
installed on the fore-and-aft line of the ship.
[IMO Resolution MSC.86(70), Annex 2, 4.1.2] The fore-and-aft marks shall be within ±0,5° of the fore-and-
aft axis of the unit.
5.5 Graduation
5.5.1 Graduation of main compass card
The main compass shall be of the compass card type, which shall be graduated in 360 single degrees,
starting from North (000°) in the clockwise direction as viewed from above. Each tenth degree shall
be marked with the three corresponding numbers. The accuracy of the graduation shall be better than
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ISO 11606:2022(E)
0,2° on any heading. The cardinal points shall be indicated by the capital letters N, S, E and W; the
intermediate points may also be marked.
Alternatively, the North point may be indicated by a suitable symbol.
5.5.2 Indication of the repeater indicator
The graduation of the indicator, if of the card type, shall be the same as that of the main compass card. If
a repeater indicator is used for steering purposes, it shall be of the card type.
In the case of numerical displays, three-digit numbers, in degrees, shall be shown.
5.5.3 Centre of the graduation
The main compass, and repeater indicators to be used for bearing purposes, shall be fitted with a seat
for a shadow pin which accommodates bearings or, if no seat is provided, the centre of the graduation
shall be clearly indicated.
5.5.4 Graduation of the verge ring
The main compass, and repeater indicators to be used for bearing purposes, shall be provided with a
verge ring, which is graduated in degrees, for the measurement of bearings relative to the ship's head.
The scale shall be graduated in 360 single degrees in clockwise direction as viewed from above.
Both the zero mark indicating the bearing of the ship's head and the 180° mark indicating the bearing of
the ship's stern shall be within ±0,5° of the fore-and-aft marks.
5.5.5 Accuracy of fore-and-aft marks
The fore-and-aft marks of the main compass, and of repeater indicators to be used for bearing purposes,
shall be in the vertical plane passing through the centre of the compass card and the main lubber mark
to within ±0,5°.
5.5.6 R
...