| International Optimist Dinghy Association (IODA) |
www.optiworld.org |
| Belgian Optimst Class Association |
www.optimist.be |
| Dutch Optimist Class Association (OCN) |
www.optimist.nl |
| French Optimist Class Association |
www.promotion-optimist.fr |
| Irish Optimist Class Association (IODAI) |
www.iodai.com |
| International Sailing Federation (ISAF) |
www.sailing.org |
| Royal Yachting Association |
www.rya.org.uk |
| National School Sailing Association |
www.nssa.org.uk |
| Volvo Cars UK |
www.volvocars.co.uk/sailing |
| Musto Ltd |
www.musto.co.uk |
| Neilson Active Holidays |
www.neilson.co.uk |
| Yachts and Yachting |
www.yachtsandyachting.com |
| Free Results Software (as used by IOCA) |
www.componentsource.com/sailing |
| Peter Bentley Photographs |
www.peterbentleypictures.com |