Offshore Big Boats

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

Portsmouth Yardstick

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

HPR (High Performance Rule)

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

ORR (Offshore Racing Rule)

A measurement based secret Velocity Prediction Program Rating rule used in major U.S. ocean races.


A secret measurement rule used internationally and jointly administered by RORC (Royal Ocean Racing Club) and UNCL. US Sailing handles the processing and issuing of all certificates for U.S. boats.

PHRF (Performance Handicap Racing Fleet)

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


US Sailing offers three distinct Safety at Sea seminars aimed at preparing sailors for offshore sailing conditions.

NEW Half-Day Coastal Safety at Sea Seminar in support of coastal races and cruising.

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One-Day Offshore Safety at Sea Seminars for participants in ocean races and long coastal races.

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Two-Day Offshore Safety at Sea Seminars feature hands-on training with safety gear.

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Safety Research and Analysis

US Sailing’s Safety at Sea Committee has conducted several independent reviews of sailing accidents over the years. These archived safety reports have been used to provide the latest updates and recommendations for best practices in safety equipment, rescue procedures and emergency planning. Safety reports archive

ISAF Offshore Special Regulations

US Sailing Safety at Sea Committee reviews and makes recommendations for changes to the ISAF Offshore Special Regulations, including US Sailing Prescriptions. US Sailing conducted an overhaul of ISAF’s Offshore Special Regulations to tailor them for use in the U.S. They are now more user-friendly and more widely used. Learn more


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