Yachts racing under the Racing Rules of Sailing (ie. any boat racing under any of the rating rules we administer) must hold an approved sail number as prescribed by her national authority. This sail number shall be displayed in accordance with RRS 77, Identification on Sails.

In the UK, sail numbers are issued by the RYA or by the RORC Rating Office. RYA members can obtain a sail number from the RYA free of charge, contact them on tel 0845 345 0400 E-mail . Sail numbers issued by the RYA will have a Y,M,N,T,A or L suffix. Clyde Yacht Clubs' Association numbers (C suffix) are also approved under RRS Appendix G .

RORC sail numbers have an R suffix.

Standard sail numbers are available in the range 1000 - 9999.  RORC members are entitled to a 3-figure sail number.

To apply for a standard 4-figure RORC sail number please register with MyIRC (see main menu item above) if you have not already done so. You then have the option to select and pay for your sail number online, and will get a discount on the sail number fee.

If you experience problems with this please contact the RORC Rating Office.

For 3-figure number if you are a RORC member, please contact the RORC Rating Office. 

Important information regarding the issue of sail numbers, and what happens if you sell your boat.


Seahorse Rating Ltd, Seahorse Building, Bath Road, Lymington, Hampshire, SO41 3SE.
Registered in England, Company Registration Number 2041269

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