Overview
ISO 25862:2019/Amd 1:2024 is the latest amendment to the international standard governing marine magnetic compasses, binnacles, and azimuth reading devices for ships and marine technology. This amendment enhances the original 2019 second edition by providing detailed specifications on compass safe distance measurement, critical for ensuring accurate navigation and minimizing magnetic interference aboard vessels. Developed by ISO Technical Committee ISO/TC 8, Subcommittee SC 6, this document aligns with international electrotechnical standards to promote reliable marine navigation instrumentation.
Key Topics
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Marine Magnetic Compass Standards
The amendment updates testing methods and requirements for marine magnetic compasses, ensuring robust performance in maritime environments.
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Compass Safe Distance Measurement
Annex I introduces practical specifications for measuring the safe distance to prevent magnetic interference from equipment or vessel parts, enhancing compass accuracy.
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Test Conditions and Procedures
Specifies ambient conditions (temperature, humidity, electromagnetic environment), power supply tolerances, and test equipment requirements according to IEC 60945:2002 and IEC 61000-4-8:2009.
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Measurement Methods
- Angle Sensitive Sensor Method: Uses sensors or compasses that detect angle deviations caused by nearby magnetic fields, defining safe distance by maximum permissible deflection.
- Magnetic Sensor Method: Applies magnetic sensors measuring field strength in microteslas (µT) to calculate safe distances based on maximum allowable magnetic deviations.
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Magnetization Procedures
Details steps to magnetize equipment under test using Helmholtz coils to simulate operational magnetic conditions and assess interference impact.
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Equipment and Environment Requirements
Guidelines to minimize external interference, ensuring measurement accuracy through artificial homogeneous magnetic fields and avoidance of ferromagnetic disturbances.
Applications
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Ship Navigation Safety
Ensures marine magnetic compasses maintain precise direction readings by defining safe installation distances from magnetic sources, critical for safe navigation and maneuvering.
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Marine Equipment Testing Laboratories
Provides standardized procedures for laboratories to evaluate compass interference and certify compliance with marine navigation standards.
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Vessel Design and Installation
Assists shipbuilders and marine engineers in selecting suitable compass placement and mounting configurations to mitigate magnetic interference.
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Maritime Regulatory Compliance
Supports compliance with international maritime regulations requiring accurate compass performance and electromagnetic compatibility (EMC).
Related Standards
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IEC 60945:2002 - Maritime navigation and radio communication equipment and systems - General requirements - Methods of testing and required test results, referenced for test conditions and power supply specifications.
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IEC 61000-4-8:2009 - Electromagnetic compatibility (EMC) Part 4-8: Testing and measurement techniques - Power frequency magnetic field immunity test, cited for magnetization and magnetic field test methods within compass safe distance measurement.
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ISO 11606 - Ships and marine technology - Marine electromagnetic compasses, referenced for approval of electronic compass sensors used during testing.
Practical Value
ISO 25862:2019/Amd 1:2024 provides marine professionals with a comprehensive framework to accurately measure and mitigate magnetic interference affecting marine compasses and azimuth reading devices. By adhering to these updated standards, ship operators and equipment manufacturers can ensure reliable navigation systems, reducing risks related to compass errors. The standardized test methods also promote consistency across laboratories and facilitate global acceptance of marine navigation equipment performance, enhancing maritime safety and operational efficiency.
For more information or to obtain the full document, visit ISO's official website.
Open preview (PDF)Ships and marine technology — Marine magnetic compasses, binnacles and azimuth reading devices — Amendment 1
