Overview
ISO 25197:2020 - Small craft - Electrical/electronic control systems for steering, shift and throttle - defines requirements for the design, construction and testing of electrical/electronic steering, shift and throttle systems and dynamic-positioning systems (DPS) on small craft up to 24 m length of hull. The standard covers whole-system components (input devices, CPUs, harnesses, actuators) and excludes electric trolling motors and autopilot systems on sailing craft.
Key topics and technical requirements
- System coverage: Electrical and electronic steering, combined or separate shift and throttle systems, joystick controls and DPS functionality.
- Components and interfaces: Control heads, command-station transfer, portable helm station controls, actuators and wiring harnesses.
- Failure modes and responses: Requirements for loss of operation, loss of computer command logic, fail‑safe modes and alarm policies.
- Testing requirements:
- Functional tests for steering, control levers (shift/throttle) and joysticks (including operational/durability tests).
- Extensive environmental testing: salt mist, damp heat (cyclic and steady state), high/low temperature (operation and storage), immersion considerations, UV exposure.
- Mechanical robustness: vibration, shock, drop tests.
- Electromagnetic compatibility (EMC): immunity to radiated/conducted RF, fast transients (bursts), surges, ESD, power supply variation; radiated and conducted emissions requirements.
- Electrical safety checks: insulation resistance and compass safe distance evaluations.
- Marking and documentation: Labelling requirements and mandatory owner’s manual instructions for safe operation and maintenance.
Practical applications and who uses it
ISO 25197:2020 is used to:
- Guide marine electronics manufacturers in product design and certification of electronic steering, throttle and shift systems.
- Define test programs for independent test labs and shipyards when validating control systems and DPS installations on small craft.
- Support system integrators and OEMs in ensuring interoperability, durability and EMC compliance.
- Inform regulatory bodies, classification societies and procurement teams assessing equipment suitability for recreational and commercial small craft.
- Help owners/operators understand required labelling and manual information for safe operation.
Related standards
ISO 25197 references and aligns with several marine and IEC/ISO documents for testing and environmental conditions, including but not limited to ISO 8846, ISO 10133, ISO 11591, IEC 60945 and multiple IEC/ISO tests for EMC, salt mist and climatic/mechanical loads.
Keywords: ISO 25197:2020, small craft electrical control systems, steering shift throttle, dynamic positioning, EMC testing, environmental testing, joystick durability, fail-safe marine controls.