Offshore | United States Sailing Association

RATING RULES AND MEASUREMENT

US Sailing provides big boat rating and handicapping services. Currently we service five rules.

HPR was developed to create a grand prix level development rating rule for modern planing racers.

The IRC Rule is an ISAF International Rating System using measurement data and administered by RORC (Royal Ocean Racing Club) and UNCL (Union Nationale pour la Course au Large).

ORC is an open and transparent Velocity Prediction Program (VPP) rating rule that devises ratings for inshore and offshore races worldwide. US Sailing issues ORC Club and ORC International certificates for all US-based boats.

ORR is based in the US and is the largest Velocity Prediction (VPP) rule used in North America for both ocean and inshore competitions. ORR is a limited access VPP system that is intended to be a non-type forming rule that fairly rates properly designed and well prepared boats.

An observed performance handicapping system that serves over 20,000 boats in the U.S.

A time-on-time handicapping system derived from boat class records with documented ratings.

US Sailing provides customized performance predictions packages for individual yachts. Calculations are conducted with the highly accurate Offshore Racing Rule VPP. Also, US Sailing uses ORR or IMS measurement data. Performance packages are available for unmodified sisterships of ORR rated production yachts. The packages include tables of performance for wind speeds from 6 to 24 knots (now available as electronic files for onboard instrumentation), polar diagrams in both True and Apparent Wind format, Wally analysis, curve of static stability, upright hydrostatic calculations and instructions for use. Learn more

Per the Racing Rules of Sailing, the Offshore office issues sail numbers that meet national and international standards. Learn More

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Offshore | United States Sailing Association