The purpose of the ISAF Offshore Special Regulations (referred to as OSR below) is to establish uniform minimum equipment, accommodation and training standards for monohull and multihull yachts racing offshore.

The RORC categorises its races depending on the duration, exposure of the race course, distance to the shoreline and the degree of self-sufficency required. The RORC also includes prescriptions to the OSR.

A RORC Offshore Weekend Race is usually OSR Category 3, plus Liferafts as set out in Category 2.
Inshore Races like RORC Easter Challenge or IRC National Championship are usually OSR Category 4.
Other Events like the Rolex Fastnet Race or the Sevenstar Round Britain and Ireland Race are usually OSR Category 2 or 1.

Please check the RORC's Notice of Race for the OSR Category required for the race you enter.

To help simplify the Regulations we have extracted the categories into individual files that you view below:

Mono-/Multihull, including RORC Prescriptions

• OSR, complete document
• OSR Category 2
• OSR Category 3 plus Category 2 Liferafts
• OSR Category 4

Multihull only

• OSR, complete document
• OSR Category 2
• OSR Category 3 plus Category 2 Liferafts
• OSR Category 4