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UDC 629.12 : 538.74
IS0
I NT ERN AT I O NA L O RG A N I ZAT I O N FO R STA N DA RD I2 AT1 ON
IS0 RECOMMENDATION
R 613
MAGNETIC COMPASSES,
BINNACLES AND AZIMUTH READING DEVICES, CLASS B
GENERAL REQUIREMENTS
1st EDITION
A ug ust 1967
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 61 3, Magnetic Compasses, Binnacles and Azimuth Reading
Devices, Class B, General Requirements, was drawn up by Technical Committee ISO/TC 8,
Shipbuilding Details, the Secretariat of which is held by the Nederlands Normalisatie-
instituut ("1).
Work on this question by the Technical Committee began in 1959 and led, in 1964,
to the adoption of a Draft IS0 Recommendation.
In October 1965, this Draft IS0 Recommendation (No. 857) was circulated to ail the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an
editorial nature, by the following Member Bodies :
Argentina Finland Spain
Australia
France Sweden
Austria
India U.A.R.
Belgium Ireland United Kingdom
Brazil Israel U.S.S.R.
Canada
Netherlands Yugoslavia
Chile New Zealand
Czechoslovakia Poland
Three Member Bodies opposed the approval of the Draft:
Germany
Italy
Japan
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in August 1967, to accept it as an IS0 RECOMMENDATION.
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I
IS0 / R 613 . 1967 (E)
CONTENTS
Page
Introduction . 6
1.General . 6
1.1 Scope . 6
1.2 Units . 6
1.3 Definitions . 7
1.4 Marking . 7
2 . Magnetic compasses . 7
2.1 Construction and materials . 7
2.2 Mounting . 8
2.3 Directional system . 9
2.4 Graduation . 9
2.5 Accuracy . 10
. Binnacles. helmets and boxes . 10
3
3.1 Construction and materials . 10
3.2 Provision for correction of deviations . 10
3.3 Accuracy of fore-and-aft marks . 10
3.4 Illumination . 10
11
4 . Azimuth reading device .
.
4.1 Fieldofview . 11
4.2 Accuracy . 11
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'
iSO/ R 613 - 1967 (E)
IS0 Recommendation R 613 August 1967
MAGNETIC COMPASSES,
BINNACLES AND AZIMUTH READING DEVICES, CLASS B
GENERAL REQUIREMENTS
INTRODUCTION
This IS0 Recommendation refers to the general requirements for the construction and per-
formance of magnetic compasses, binnacles and azimuth reading devices, Class B. *
1. GENERAL
1.1 Scope
This IS0 Recommendation refers to liquid magnetic compasses
- intended for use on board ships in which a Class A compass is not essential,
- equipped with a direct reading system
- and which may be of the reflecting, projecting or transmitting type.
In this context, a magnetic compass is an instrument consisting of a directional system
supported on a single pivot inside a bowl which is completely filled with liquid and which
is supported in gimbals.
Hemispherical compasses, which are not supported in gimbals, are also covered by this
IS0 Recommendation. The requirements relating to gimbals do not, however, apply to such
compasses.
1.1.1 Exclusions. This IS0 Recommendation does not refer to
(a) dry card compasses,
(b) types of compasses designed on principles different from those stated in clause 1.1
above or not complying with the description in that clause.
1.2 Units
In view of the present established practice, the following units have been retained :
the oersted as the unit of magnetic field strength and
the CGS unit as the unit of magnetic moment.
Corresponding units in the International System (S.I.) are :
The magnetic,field strength A x m-l corresponds to 4~10~ oersted.
The magnetic moment A x m2 corresponds to 103 CGS units.
* Other IS0 Recommendations for magnetic compasses:
SOIR 449, Magnetic Compasses and Binnacles, Class A, for Use in Sea Navigation.
ISO/R . . . , Positioning of Magnetic Compasses in Ships, at present Draft IS0 Recommendation No. 858.
ISOIR . . ., Magnetic Compasses and Binnacles for Sea Navigation-Vocabulary of Terminology, at present Draft IS0
Recommendation No. 1145.
ISOiR . . ., Rules for Testing and Certification of Magnetic Compasses and Accessories-Part I-Type Testing and
Certification, at present at the stage of draft proposal.
SOIR . . . , Rules for Testing and Certification of Magnetic Compasses and Accessories-Part II-Individual Testing
and Certification, at present at the stage of draft proposal.
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IS0 / R 613 - 1967 (E)
1.3 Definitions
The terms used in this IS0 Recommendation are defined in IS0 Recommendation R . . . *,
The following parts should be marked with the information and in the position shown in
Table 1.
TABLE 1. - Marking requirements
Position of manufacturer's name or other means Position of serial number
Name of part
of identification on the part
(a) the directional system (a) the directional system
Magnetic
compass (b) the verge ring (b) the verge ring
(c) the gimbal ring or ring
any convenient position not required
Binnacle
Azimuth on top of the base of the azimuth on top of the base of the
reading device reading device azimuth reading device
NOTE. - The type of liquid used, if other than alcohol, should be indicated on the bowl in the vicinity of the
filling plug.
2. MAGNETIC COMPASSES
2.1 Construction and materials
2.1.1 The magnets used in the directional systems of magnetic compasses should be of a
suitable magnetic material having a high remanence and a high coercivity. All other
materials used in magnetic compasses, other than transmitting compasses, should be
of non-magnetic material.
2.1.2 The distance between the lubber mark and the outer edge of the card should be
between 1.5 and 3.0 mm. The width of the lubber mark should not be greater than 1"
of the graduation of the card. The lubber mark should be so designed as to allow
loo, in the case of a gimballed compass,
the compass to be read when the bowl is tilted
or 30" in the case of a hemispherical compass.
* At present Draft IS0 Recommendation No. 1145.
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lSO/ R 613 - 1967 (E)
2.1.3 When the verge ring (and, if applicable, the seating of the azimuth reading device) is
(are both) horizontal, the graduated edge of the card, the lubber mark, if a point, the
pivot point and the outer gimbal axis, should all lie within 1 mm of the horizontal plane
passing through the gimbal axis fixed to the bowl.
2.1.4 The gimbal axes should be m
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