The new supplement includes one new case, Case 113 which interprets rule 20.1, Room to Tack at an Obstruction Hailing and Responding. This case was approved for publication at the ISAF Annual Conference in November 2009.

The new Supplement also includes changes necessitated by the changes in the rules that took effect on 1 January 2010, as well as correction of a few errors in wording and typographical errors. Such changes were made in Cases 2, 10, 27, 55, 76, 93, 95 and 96.

The 2010 Supplement and the complete version of The Case Book for 2009-2012, revised to include the changes contained in the Supplement, are available to download from the ISAF website at www.sailing.org/casebook.

About The Case Book and The Racing Rules of Sailing

The Case Book contains interpretations of The Racing Rules of Sailing for 2009-2012 RRS. A revised edition is published every four years to coincide with the revised edition of the RRS.

The aim of the Case Book is to increase understanding of the rules and promote consistency of their application worldwide. ISAF has been publishing interpretations of the RRS for over 40 years and the current edition, The Case Book for 2009-2012, contains details on the application of the rules to over 100 scenarios.

As well as publishing a revised edition every four years, to keep up to date with changes and new issues arising in the sailing world, in each of the following three years a supplement to The Case Book is published.