Overview
ISO 14946:2021 specifies what is included in the maximum load of small craft and sets requirements for seating and occupancy areas without exceeding limits imposed by other ISO standards for stability, freeboard, and flotation. Personal watercraft are excluded. The standard clarifies manufacturer declarations (maximum recommended load), the builder's plate entry, and the information required in the owner's manual.
Key Topics
- Maximum recommended number of persons: The manufacturer's declared maximum shall not exceed the number of seats and occupancy areas assigned. Seat and occupancy dimensions are defined to ensure safe stowage and movement:
- Seat: minimum 400 mm width × 750 mm length (including clear foot space).
- Occupancy area: minimum 400 mm × 400 mm clear space per person.
- Crew mass: Each crew member is limited at 75 kg for load calculations (with reference notes for children in related standards).
- Definition of maximum load (m_ML): The load in addition to light craft mass comprising at least:
- crew mass (75 kg each);
- personal effects of crew;
- stores and cargo, dry provisions, consumable liquids;
- contents of permanently installed storage tanks filled to 95% of capacity (fuel, water, oils, live wells, etc.);
- ballast water at 100% capacity;
- consumable liquids in portable tanks (filled to 95%);
- dinghy or carried craft and associated outboards;
- liferafts above minimum required equipment;
- non-edible loose stores and equipment not in the standard equipment list.
- Manufacturer's maximum recommended load (ML): Determined in accordance with stability, freeboard, buoyancy and flotation requirements for the craft's design category; it can be downrated for safety or by other standards.
- Builder's plate maximum load (m_MBP): The value shown on the builder's plate excludes the weight of contents of fixed tanks (items specified above under permanently installed tanks and ballast).
- Owner's manual: Must state the maximum recommended number of persons and the builder's plate maximum load as required by Clauses 4 and 7.
Applications
- Use by designers and naval architects when calculating safe load limits and seating/occupancy plans.
- Guidance for manufacturers to populate the builder's plate and owner's manual with compliant information.
- Reference for compliance checks by regulators, surveyors, and importers to ensure declared loads do not compromise stability or flotation.
- Practical for owners/operators to understand how on-board stores, fuel, and passengers affect safe operating limits.
Related Standards
- ISO 12217 (all parts) - stability, buoyancy and flotation assessment and categorization (methods referenced for verification).
- ISO 8666:2020 - principal data and light craft mass definitions.
- ISO 6185 (all parts) - inflatable boats (referenced for child occupancy guidance).
ISO 14946:2021 provides clear, practicable rules for load accounting and occupant area design to support safe small craft operation and consistent manufacturer declarations.
