ISO 11606:2000
(Main)Ships and marine technology — Marine electromagnetic compasses
Ships and marine technology — Marine electromagnetic compasses
This International Standard specifies general requirements, type tests and individual tests for 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). The magnetic compasses specified in this standard shall apply to the ships the overall length of which is normally not less than 24m . In this context an electromagnetic compass is an item of electronic equipment which uses the geomagnetic field to obtain information about the ship's heading. This information is conveyed to the main compass (which is used for steering and taking bearings), to additional repeater indicators and, if required, to other navigational equipment. NOTE All requirements that are extracted from the recommendations of IMO resolutions are printed in italics.
Navires et technologie maritime — Compas électromagnétiques de marine
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 11606
Second edition
2000-08-15
Ships and marine technology — Marine
electromagnetic compasses
Navires et technologie maritime — Compas électromagnétiques de marine
Reference number
ISO 11606:2000(E)
© ISO 2000
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ISO 11606:2000(E)
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ISO 11606:2000(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Composition . 2
5 Construction and material . 2
6 Performance . 6
7 Precautions against failure . 7
8 Marking . 7
9 Type testing and individual testing . 7
10 Certification . 7
11 Testing . 8
12 Designation . 13
Annex
A Equivalent requirements in ISO 11606 and IMO Resolutions. 14
Bibliography. 15
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ISO 11606:2000(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 com-
mittees. 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 liai-
son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 11606 was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 6, Navigation.
This second edition cancels and replaces the first edition (ISO 11606:1997), which has been technically revised.
Annex A of this International Standard is for information only.
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INTERNATIONAL STANDARD ISO 11606:2000(E)
Ships and marine technology — Marine electromagnetic
compasses
1 Scope
This International Standard specifies general requirements, type tests and individual tests for marine electromag-
netic compasses intended for steering purposes and/or taking bearings on board ships required by Chapter V of SO-
LAS, 1974 and the International Code of Safety for High-Speed Craft (HSC Code). The magnetic compasses
specified in this standard shall apply to the ships the overall length of which is normally not less than 24 m. In this
context an electromagnetic compass is an item of electronic equipment which uses the geomagnetic field to obtain
information about the ship's heading. This information is conveyed to the main compass (which is used for steering
and taking bearings), to additional repeater indicators and, if required, to other navigational equipment.
NOTE All requirements that are extracted from the recommendations of IMO resolutions are printed in italics.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publica-
tions do not apply. However, parties to agreements based on this International Standard are encouraged to investi-
gate the possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain reg-
isters of currently valid International Standards.
ISO 449:1997, Ships and marine technology — Magnetic compasses, binnacles and azimuth reading devices —
Class A.
ISO 1069, Magnetic compasses and binnacles for sea navigation — Vocabulary.
IEC 60945, Marine navigation and radiocommunication equipment and systems — General requirements — Meth-
ods of testing and required test results.
IEC 61162 (both parts), Maritime navigation and radiocommunication equipment and systems — Digital interfaces.
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 elec-
tronic ship's equipment.
IMO Resolution MSC.86(70), Annex 2, Recommendation on performance standards for marine transmitting mag-
netic heading devices (TMHD's).
3 Terms and definitions
For the purposes of this International Standard, the definitions given in ISO 1069 and the following terms and defini-
tions apply.
3.1
magnetic sensor
sensor which detects the geomagnetic field and supplies an appropriate output concerning direction to the processor
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ISO 11606:2000(E)
3.2
processor
device which processes the output of the magnetic sensor and provides the ship's magnetic heading and/or true
heading
3.3
main compass
display unit which shows the output of the processor with a compass card or an electronic image of a compass card
3.4
repeater indicator
additional indicator which may be equipped with a display which 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 following requirements.
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.
NOTE 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
Fore-and-aft marks shall be inscribed on the housing of the magnetic sensor system and the bottom part of the bin-
nacle of the main compass. The units shall be installed on the fore-and-aft line of the ship.
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 cor-
�
responding numbers. The accuracy of the graduation shall be better than 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.
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ISO 11606:2000(E)
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 grad-
uated in 360 single degrees in the clockwise direction as viewed from above.
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Both the zero mark indicating the bearing of the ship's head and the 180 mark indicating the bearing of the ship's
�
� 0,5
stern shall be within 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 Readability of the graduation
It shall be possible for a person with normal vision to read the main compass card and the indication of the repeater
indicator at a distance of 1,0 m, both in daylight and in artificial light.
5.5.7 Horizontal position of the compass plane
The plane of the compass card of the main compass, and of repeater indicators to be used for bearing purposes,
�
shall be so balanced that it is horizontal to within� 2 .
5.6 Lubber marks
5.6.1 General
The main compass display and all repeater indicators shall be fitted with at least one lubber mark, indicating the di-
rection of the ship's head. Additional lubber marks indicating the direction of the ship's stem and thwartships are per-
missible.
�
0,5 0,5 mm
The width of the lubber mark shall not be greater than on the card or , whichever is smaller.
The distance between the lubber mark and the outer edge of the card shall not be more than 1,5 mm.
5.6.2 Accuracy
� � �
� 0,5 0 180
The main lubber mark shall be within of the to line of the verge ring.
�
Additional lubber marks shall be within� 1 .
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ISO 11606:2000(E)
5.7 Illumination
The units shall be provided with adequate provision for illuminating the controls and displays. A device shall be pro-
vided for dimming the electric light.
5.8 Compensation of deviation and heeling error
5.8.1 Introduction
Provision shall be made for correcting the heeling error and the coefficients A, B, C, D and E. It shall be possible to
correct the following values:
— vertical component of the ship's magnetic field (producing the heeling error): up to ± 75μT;
— coefficient A: up to ± 3°;
— coefficient B: up to ± (720/H)°;
— coefficient C: up to ± (720/H)°;
— coefficient D: up to ± 7°;
— coefficient E: up to ± 3°;
where H is the horizontal component of the geomagnetic flux density in microteslas (μT).
The devices for correcting the coefficients A, B, C, D and E shall not produce any undesired deviation greater than
�
1 . The device for correcting heeling error shall not produce any undesired alteration of the vertical component of the
ship's magnetic field greater than 1T.
5.8.2 Indication of compensation
The values used for electronic compensation shall be indicated by adequate means and shall be stored such that
values are automatically recovered on switch on.
5.8.3 Protection of compensation devices
The compensating devices shall be protected against accidental alterations.
5.9 Heading output
The type of heading displayed or transmitted shall be conspicuously indicated. All displays and outputs of heading
should be able to indicate true heading. An indication of any deviation and variation applied to compensate the head-
ing shall be capable of being displayed or included in the output.
5.10 Outputs to other equipment
The electromagnetic compass shall be so designed that it is able to provide the azimuth information, within a trans-
�
mitting error of not greater than� 0,5 , to the navigational equipment, radars, direction finders, heading control sys-
tems and additional position measurement instruments. If these navigational instruments have digital outputs, they
shall conform to IEC 61162.
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ISO 11606:2000(E)
5.11 Gimbals
5.11.1 Direction of gimbal axes
If gimbals are provided, the outer gimbal axis shall be in the fore-and-aft direction.
5.11.2 Angle between the gimbal axes
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If gimbals are provided, the angle between the inner and outer gimbal axes shall be 90 � 1 , except if the diameter
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of the outer gimbal ring is less than 150 mm: in this case the angle shall be 90 � 2 .
5.11.3 Freedom of tilt of the main compass
�
The main compass shall be constructed in such a way that it can revolve about the inner gimbal axis freely up to 30
when the gimbal ring, if fitted, is horizontal.
5.11.4 Precaution against dislodging of the main compass and the repeater indicators
The main compass and repeater indicators shall be constructed in such a way that, if they are fitted on gimbals, they
return to their normal position and are not dislodged after tilting.
5.12 Fitting the main compass
Provision shall be made in the bottom part of the magnetic sensor unit, the main compass and card-type repeater in-
dicators in order to allow correction of any misalignment thereof in respect of the fore-and-aft line of the ship, by an
�
angle of up to� 5 .
5.13 Height of the compass card plane
Main compasses shall be so constructed that the plane of the compass card is at least 1m above the lower surface
of the binnacle deck fittings, and capable of taking bearings of celestial bodies and other distant objects.
5.14 Watertightness of repeater indicators
The main compass and all repeater indicators intended for use on an open deck shall be waterproof.
5.15 Azimuth reading devices
5.15.1 Provision of azimuth reading devices
There shall be at least one appropriate azimuth reading device to take bearings of celestial bodies and other distant
objects.
5.15.2 Azimuth sight
�
The field of vision shall be at least 5 on each side of the line sight and it shall be possible to take azimuths of celes-
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tial bodies and bearings of distant objects whose altitudes are between 5 below and 60 above the horizontal.
�
This requirement on the accuracy of the azimuth shall be fulfilled in the altitude range from 5 above the horizontal to
�
50 above the horizontal.
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ISO 11606:2000(E)
5.16 Construction for maintenance and inspection
Equipment shall be so constructed that it is possible to carry out maintenance and inspection easily.
5.17 Protection against changes in power supply
Means shall be incorporated for the protection of equipment from the effects of excessive current and voltage, tran-
sients and accidental reversal of the power supply polarity.
6 Performance
6.1 Preconditions
Performance within the temperature range between
� � � �
25 C� 3C7and0 C� 3 C for equipment or units intended to be exposed to the weather and
� � � �
15 C� 3C5and5 C� 3 C for equipment or units intended to be protected from the weather
shall conform to the requirements of 6.2 to 6.6.
The use of temperature controllers is permitted.
6.2 Accuracy of heading
6.2.1 Static accuracy
The static accuracy of the heading indication shall be within ± 1,0°.
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