ISO 25862:2019

Ships and marine technology — Marine magnetic compasses, binnacles and azimuth reading devices

This document specifies requirements for the construction and performance of marine magnetic compasses for navigation and steering purposes, binnacles and azimuth reading devices. Two types of binnacle are specified; the appropriate type for a given vessel is determined by the design of the ship (see Clause 5). This document applies to liquid-filled magnetic compasses: — intended for use in ship's navigation and steering in sea navigation; — having a direct reading system; and — which can be of the reflecting, projecting or transmitting types. In the context of this document, a magnetic compass is an instrument consisting of a directional system supported by a single pivot inside a bowl that is completely filled with liquid and supported by gimbals inside or outside the bowl. However, this document also addresses compasses without gimbals; the requirements relating to gimbals do not apply to such compasses. This document applies to magnetic compasses carried on board: a) all ships required to carry a standard compass as per SOLAS Chapter V, the Class A magnetic compass; b) lifeboats and rescue boats as per the IMO Lifesaving Appliances (LSA) Code, fitted with the Class B magnetic compass; and c) all ships to which a) and b) above do not apply, but which are fitted with a Class A or B magnetic compass. This document 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; or c) hand bearing compasses. The requirements for the testing and certification of marine magnetic compasses, azimuth reading devices and binnacles are given in Annexes A, B, C, and D. The requirements for the positioning in ships, the determination of safe distances and the deviation adjustment of compasses are given in Annexes E, F and G, respectively. The special requirements of the magnetic compass for lifeboats/rescue boats are given in Annex H.

Navires et structures maritimes — Compas magnétiques marins, habitacles et alidades

General Information

• Status: Published
• Publication Date: 11-Jul-2019
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: ISO/TC 8/SC 6 - Navigation and ship operations
• Drafting Committee: ISO/TC 8/SC 6/WG 3 - Magnetic compasses and binnacles
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jul-2024
• Completion Date: 15-Jul-2024

Relations

• Amended By: ISO 25862:2019/Amd 1:2024 - Ships and marine technology — Marine magnetic compasses, binnacles and azimuth reading devices — Amendment 1
• Effective Date: 06-Jun-2022
• Revises: ISO 25862:2009 - Ships and marine technology — Marine magnetic compasses, binnacles and azimuth reading devices
• Effective Date: 05-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 25862
Second edition
2019-07
Ships and marine technology —
Marine magnetic compasses, binnacles
and azimuth reading devices
Navires et structures maritimes — Compas magnétiques marins,
habitacles et alidades
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Magnetic compasses . 2
4.1 General . 2
4.1.1 Class A magnetic compass . 2
4.1.2 Class B magnetic compass . 2
4.2 Construction and materials . 3
4.2.1 Magnetic material . 3
4.2.2 Lubber mark . 3
4.2.3 Position of the card (class A only) . 3
4.2.4 Angle of gimbal axes and intersection of vertical planes passing through them . 3
4.2.5 Thickness of the top glass cover (class A only) . 3
4.2.6 Constructional condition within the temperature range . 3
4.2.7 Horizontal position . 4
4.3 Mounting . 4
4.3.1 Tilt of supporting device . 4
4.3.2 Freedom of the compass card with no supporting gimbal . 4
4.4 Directional system . 4
4.4.1 Moment of inertia . 4
4.4.2 Suspension (class A only) . 4
4.4.3 Magnetic moment . 4
4.4.4 Settling time . 5
4.4.5 Tilt of the directional system with regard to the vertical field (class A only) . 5
4.4.6 Supporting force (class A only) . 6
4.5 Compass card . 6
4.5.1 Graduation . 6
4.5.2 Diameter of the card . 6
4.5.3 Readability . 6
4.5.4 Bearing compasses . 7
4.6 Accuracy . 7
4.6.1 Directional error . 7
4.6.2 Error of lubber marks . . 7
4.6.3 Error due to friction . 7
4.6.4 Swirl error . 8
4.6.5 Induction error (class A only) . 8
4.6.6 Mounting error of azimuth reading device . 8
4.6.7 Error due to eccentricity of the verge ring (class A only). 8
4.7 Environmental conditions tests of magnetic compasses (class A only) . 8
5 Binnacles . 9
5.1 General . 9
5.2 Binnacle type A1 . 9
5.2.1 General. 9
5.2.2 Construction and materials . 9
5.2.3 Provision for correction of deviation (if combined with class B compasses) . 9
5.2.4 Accuracy of fore and aft marks .11
5.2.5 Illumination .11
5.2.6 Environmental conditions requirements (class A only) .11
5.3 Binnacle type A2 .11
5.3.1 General.11
5.3.2 Construction and materials .11
5.3.3 Provision for correction of deviation .11
5.3.4 Accuracy of fore and aft marks .12
5.3.5 Illumination .13
5.3.6 Environmental conditions requirements (class A only) .13
6 Azimuth reading devices .13
6.1 General .13
6.2 Azimuth sight .13
6.3 Azimuth reading devices with vanes .13
6.4 Level .13
7 Marking .13
8 Designation .14
Annex A (normative) Testing and certification of marine magnetic compasses, binnacles
and azimuth reading devices — General requirements .15
Annex B (normative) Testing and certification of marine magnetic compasses .17
Annex C (normative) Testing and certification of azimuth reading devices .27
Annex D (normative) Type-testing and certification of binnacles .32
Annex E (normative) Positioning of magnetic compasses in ships .40
Annex F (normative) Determination of safe distances .45
Annex G (normative) Adjustment of magnetic compass deviation .46
Annex H (normative) Requirements of magnetic compass for lifeboats/rescue boats .48
Bibliography .49
iv © ISO 2019 – All rights reserved

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 diff
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