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IRC is a self-measurement system. There is no requirement either to have your boat officially measured or weighed unless you want to, or you need an Endorsed certificate.
Generally, acceptable sources of data are:
Linear measurements:
- Official measurement (USSailing or local club measurer) and/or IOR, IMS or IRM measured data
- Measurements supplied by a sailmaker (sails)
- Owner or representative measurement
- Designer or builder data *
- Class standard hull data
Weight:
- Official weighing on a Certified loadcell
- Weighing on calibrated single point loadcell, preferably verified by an official or club measurer.
- Weight derived from IMS, IOR or other rating certificate.
- Weighing on weighbridge is usually accepted unless we believe it to be in error.
- Designed weight, or derived from designed sailing displacement *
- Class standard weight or sistership weighed data.
The following are NOT acceptable:
- Registered Tonnage
- Weighing on built in loadcell of crane
- Weighing on travel hoist
* Data from a sales brochure is acceptable, but we reserve the right to use different data where we believe it to be more accurate.
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