ISO 694:2000

INTERNATIONAL ISO
STANDARD 694
First edition
2000-02-01
Ships and marine technology —
Positioning of magnetic compasses in
ships
Navires et technologie maritime — Emplacement des compas magnétiques
à bord des navires
Reference number
ISO 694:2000(E)
©
ISO 2000

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ISO 694:2000(E)
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ISO 694:2000(E)
Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 General.3
5 Minimum distance requirements concerning the ship’s structure .3
6 Safe-distance requirements for magnetic and electrical equipment and electric cables.4
Annex A (normative) Determination of safe distances .6
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ISO 694:2000(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
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.
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 694 was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 6, Navigation.
This first edition of ISO 694 cancels and replaces ISO Recommendation ISO/R 694:1968. In this International
Standard only one method for the determination of safe distances is prescribed instead of the two methods in the
Recommendation. Some values of minimum distances from the ship’s iron have been changed.
Annex A forms a normative part of this International Standard.
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ISO 694:2000(E)
Introduction
The following elements produce magnetic fields which act on the magnetic compass and cause errors (deviations):
the steel parts of the ship’s construction, electric currents, electric and magnetic equipment of the ship which is
installed in the vicinity of the magnetic compass, such as radar, echo sounder, etc.
To minimize these errors, the distances of the sources of magnetic disturbant fields from the magnetic compass
should be as large as possible. This International Standard defines and prescribes the minimum distances to be
respected.
Moreover, the method for determination of safe distances of electric and magnetic equipment from the magnetic
compass is described.
In order to obtain satisfactory and durable compensation of compasses, this International Standard should be taken
into consideration during the design stage of a ship.
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INTERNATIONAL STANDARD ISO 694:2000(E)
Ships and marine technology — Positioning of magnetic
compasses in ships
1 Scope
This International Standard specifies the installation in ships of magnetic compasses and binnacles complying with
the requirements of ISO 449, ISO 613, ISO 2269 and ISO 10316.
In addition, it covers magnetic control elements used in navigational aids.
It should be noted that this International Standard is established only for general purposes. It is not necessarily
applicable to all sea-going ships.
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, these publications
do not apply. However, parties to agreements based on this International Standard are encouraged to investigate
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
registers of currently valid International Standards.
ISO 449:1997, Ships and marine technology — Magnetic compasses, binnacles and azimuth reading devices —
Class A.
ISO 613:1999, Ships and marine technology — Magnetic compasses, binnacles and azimuth reading devices —
Class B.
ISO 1069:1973, Magnetic compasses and binnacles for sea navigation — Vocabulary.
ISO 2269:1992, Shipbuilding — Class A magnetic compasses, azimuth reading devices and binnacles — Tests
and certification.
ISO 10316:1990, Shipbuilding — Class B magnetic compasses — Tests and certification.
3 Terms and definitions
For the purposes of this International Standard, the terms and definitions given in ISO 1069 and the following
apply.
3.1
magnetic control sensor
sensor using the geomagnetic field for feeding an automatic heading-control system, or controlling an off-course
alarm unit, or feeding other devices
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ISO 694:2000(E)
3.2
safe distance
distance measured between the nearest point of the item concerned and the centre of the compass, as determined
in annex A
3.3
minimum distance
distance measured between the nearest point of magnetic material which is part of the ship’s structure and the
centre of the compass, shown in Figure 1
Key
Type of magnetic material Ships in which a standard Fishing vessels and ships
compass is prescribed designed for restricted service
Uninterrupted fixed magnetic material (except
horizontal deck)
End parts of fixed magnetic material, such as top
edges of walls, partitions and bulkheads, extremities of
frames, girders, stanchions, beams, pillars and similar
steel parts. Magnetic material subject to movement at
sea such as davits, ventilators, steel doors, etc.
Large masses of magnetic material with variable fields
a
such as funnels .
a
“Funnel” is understood to mean that part of the funnel uptake or exhaust pipe which is liable to heating. The funnel casing
may be regarded as fixed magnetic material.
NOTE For the minimum distance from steering and other compasses, see clause 5.
Figure 1 — Minimum distance from the standard magnetic compass
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ISO 694:2000(E)
4 General
4.1 Compass positions
The specifications governing the minimum d
...