BS MA 2-1:1985
Withdrawn
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Magnetic compasses and binnacles Specification for class A magnetic compasses, their binnacles and azimuth reading devices (including test procedures)
Hardcopy , PDF
08-20-2013
English
11-29-1985
Foreword
Committees responsible
Specification
Section one. General
1.1 Scope
1.2 Definitions
1.3 Test certificates
Section two. Compasses, bowls and gimbals
2.1 General
2.2 Construction and materials
2.3 Gimballing
2.4 Compass bowl
2.5 Compass card bearing
2.6 Lubber marks
2.7 Directional system
2.8 Accuracy
Section three. Azimuth reading devices
3.1 Groups of azimuth devices
3.2 Marking
3.3 Materials
3.4 Mounting upon the compass
3.5 Adjustment of the spirit level
3.6 Field of view and range of altitude
3.7 Accuracy
3.8 Shadow pin
3.9 Pelorus
Section four. Binnacles and their correcting devices
4.1 General
4.2 Binnacles
Appendices
A. Type test and individual test certificate
B. Type test certificate for bearing instruments
C. Type test certificate for binnacles
Tables
1. Permissible angular error
2. Bearing error (difference from the bearing on the
horizon)
3. Bearing accuracy
Figure
1. Magnetic moment of class A liquid compasses
(minimum values)
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