ISO 613:2000
(Main)Ships and marine technology — Magnetic compasses, binnacles and azimuth reading devices — Class B
Ships and marine technology — Magnetic compasses, binnacles and azimuth reading devices — Class B
Navires et technologie maritime — Compas magnétiques, habitacles et alidades — Classe B
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INTERNATIONAL ISO
STANDARD 613
Second edition
2000-02-01
Ships and marine technology — Magnetic
compasses, binnacles and azimuth reading
devices — Class B
Navires et technologie maritime — Compas magnétiques, habitacles et
alidades — Classe B
Reference number
ISO 613:2000(E)
©
ISO 2000
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ISO 613:2000(E)
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ii © ISO 2000 – All rights reserved
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ISO 613:2000(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative reference .1
3 Terms and definitions .2
4 Magnetic compasses.2
5 Binnacles, helmets and boxes .5
6 Azimuth reading device (if fitted).5
7 Specifications for hand-bearing compasses .5
8 Marking .6
Bibliography.7
© ISO 2000 – All rights reserved iii
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ISO 613:2000(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 613 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 613:1982), which has been technically revised.
iv © ISO 2000 – All rights reserved
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INTERNATIONAL STANDARD ISO 613:2000(E)
Ships and marine technology — Magnetic compasses, binnacles
and azimuth reading devices — Class B
1 Scope
This International Standard gives general requirements regarding construction and performance for magnetic
compasses, binnacles and azimuth reading devices, class B. In addition, this International Standard includes
general requirements regarding construction and performance for hand-bearing compasses.
This International Standard applies to liquid-filled magnetic compasses, with or without gimbals,
� intended for sea navigation on board ships for "restricted service and life boats " according to the regulations in
force;
� with a sealed or non-sealed bowl;
� having a direct reading system;
� which may be of the reflecting, projecting or transmitting types.
This International Standard does not apply to
a) dry card compasses;
b) types of compass designed on principles different from those stated above or not complying with the
descriptions given.
NOTE As ISO 14227 ([7] in the bibliography) covers magnetic compasses for use in small craft of hull length up to 24 m,
this International Standard does not have any provision for them.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this International Standard. For a dated references, subsequent amendments to, or revisions of, the publications do
not apply. However, parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the normative document indicated below. For an undated
reference, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 1069:1973, Magnetic compasses and binnacles for sea navigation — Vocabulary.
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ISO 613:2000(E)
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
azimuth reading device
device which is able to take the azimuth of celestial bodies and bearings of distant objects as an azimuth circle, an
azimuth mirror, etc.
3.2
magnetic compass
instrument consisting of a directional system supported by a single pivot inside a bowl which is completely filled
with liquid, and which may be supported in gimbals inside or outside the bowl
4 Magnetic compasses
4.1 Construction and material
4.1.1 The magnets used in the directional systems of magnetic compasses shall be of a suitable magnetic
material having a high remanence and a coercivity of at least 18 kA/m.
All other materials used in magnetic compasses, other than transmitting compasses, shall be of non-magnetic
material.
4.1.2 The compass shall be fitted with at least one lubber mark, indicating the direction of the ships head (the
main lubber mark). Additional lubber marks are permissible.
The lubber mark shall be of such design as to allow the compass to be read from the steering position when the
bowl is tilted 10° in the case of a gimbal compass or 30° in other cases.
4.1.3 The gimbal axes shall be mutually perpendicular within a tolerance of not more than 2°. For compasses
without gimbals, which are also covered by this International Standard, the requirements relating to gimbals do not
apply.
4.1.4 Within the temperature range � 20°C to� 60°C:
a) the compass shall operate satisfactorily;
b) the liquid in the compass bowl shall remain clear and free from bubbles and neither emulsify nor freeze;
c) there shall be neither inward leakage of air nor outward leakage of liquid; no bubble shall form in a compass
unless it is specially provided to compensate for expansion;
A bubble provided in a compass to compensate for expansion shall not disturb the functioning and reading of the
compass.
d) the internal paint shall not blister, crack or discolour appreciably;
e) the supporting force shall be such that the directional system always remains in contact with its pivot;
f) the material of the compass card shall not distort.
4.1.5 The compass bowl shall be balanced so that its verge ring or top glass c
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