BS ISO 25862:2019
$198.66
Ships and marine technology. Marine magnetic compasses, binnacles and azimuth reading devices
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 58 |
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:
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intended for use in ship’s navigation and steering in sea navigation;
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having a direct reading system; and
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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:
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all ships required to carry a standard compass as per SOLAS Chapter V, the Class A magnetic compass;
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lifeboats and rescue boats as per the IMO Lifesaving Appliances (LSA) Code, fitted with the Class B magnetic compass; and
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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:
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dry card compasses;
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types of compass designed on principles different from those stated above or not complying with the descriptions given; or
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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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions 4 Magnetic compasses 4.1 General 4.1.1 Class A magnetic compass 4.1.2 Class B magnetic compass |
| 11 | 4.2 Construction and materials 4.2.1 Magnetic material 4.2.2 Lubber mark 4.2.3 Position of the card (class A only) 4.2.4 Angle of gimbal axes and intersection of vertical planes passing through them 4.2.5 Thickness of the top glass cover (class A only) 4.2.6 Constructional condition within the temperature range |
| 12 | 4.2.7 Horizontal position 4.3 Mounting 4.3.1 Tilt of supporting device 4.3.2 Freedom of the compass card with no supporting gimbal 4.4 Directional system 4.4.1 Moment of inertia 4.4.2 Suspension (class A only) 4.4.3 Magnetic moment |
| 13 | 4.4.4 Settling time 4.4.5 Tilt of the directional system with regard to the vertical field (class A only) |
| 14 | 4.4.6 Supporting force (class A only) 4.5 Compass card 4.5.1 Graduation 4.5.2 Diameter of the card 4.5.3 Readability |
| 15 | 4.5.4 Bearing compasses 4.6 Accuracy 4.6.1 Directional error 4.6.2 Error of lubber marks 4.6.3 Error due to friction |
| 16 | 4.6.4 Swirl error 4.6.5 Induction error (class A only) 4.6.6 Mounting error of azimuth reading device 4.6.7 Error due to eccentricity of the verge ring (class A only) 4.7 Environmental conditions tests of magnetic compasses (class A only) |
| 17 | 5 Binnacles 5.1 General 5.2 Binnacle type A1 5.2.1 General 5.2.2 Construction and materials 5.2.3 Provision for correction of deviation (if combined with class B compasses) |
| 19 | 5.2.4 Accuracy of fore and aft marks 5.2.5 Illumination 5.2.6 Environmental conditions requirements (class A only) 5.3 Binnacle type A2 5.3.1 General 5.3.2 Construction and materials 5.3.3 Provision for correction of deviation |
| 20 | 5.3.4 Accuracy of fore and aft marks |
| 21 | 5.3.5 Illumination 5.3.6 Environmental conditions requirements (class A only) 6 Azimuth reading devices 6.1 General 6.2 Azimuth sight 6.3 Azimuth reading devices with vanes 6.4 Level 7 Marking |
| 22 | 8 Designation |
| 23 | Annex A (normative) Testing and certification of marine magnetic compasses, binnacles and azimuth reading devices — General requirements |
| 25 | Annex B (normative) Testing and certification of marine magnetic compasses |
| 35 | Annex C (normative) Testing and certification of azimuth reading devices |
| 40 | Annex D (normative) Type-testing and certification of binnacles |
| 48 | Annex E (normative) Positioning of magnetic compasses in ships |
| 53 | Annex F (normative) Determination of safe distances |
| 54 | Annex G (normative) Adjustment of magnetic compass deviation |
| 56 | Annex H (normative) Requirements of magnetic compass for lifeboats/rescue boats |
| 57 | Bibliography |
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BS ISO 25862:2019 – TC:2020 Edition
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