US Sailing provides and manages services to facilitate safe competition for big boats in offshore racing. We offer products to improve the performance of boats, issue sail numbers that meet national and international standards, and have safety education training and certification opportunities.

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

A Brief Look at 6 Different Approaches to Handicapping today’s U.S. Fleet

HPR (High Performance Rule)

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).


The End of Season 50% discount for New certificate applications and Revalidations takes effect on September 1. The discount does not apply to amendments, trials or re-registrations.

ORC Ratings

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 (Offshore Racing Rule)

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.

PHRF (Performance Handicap Racing Fleet)

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

Portsmouth Yardstick

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.

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

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