Class Associations
- IOCA (UK)- International Optimist Class Association (UK)
- ITCA (UK) – Internation Topper Class Association (UK)
- UK RSFeva Class Association
Clubs
- ASYC – Aberdeen and Stonehaven Yacht Club
- ASC – Annandale Sailing Club
- CCC – Bardowie – Clyde Cruising Club (Dinghy Section)
- CBC – Cramond Boat Club
- CSC – Chanonry Sailing Club
- DBSC – Dalgety Bay Sailing Club
- ELYC – East Lothian Yacht Club
- HLSC – Holy Loch Sailing Club
- HSC – Helensburgh Sailing Club
- PEYC – Port Edgar Yacht Club
- Peterhead Sailing Club
- Prestwick Sailing Club
- LLSC – Loch Lomond Sailing Club
- LSC – Largs Sailing Club
- LTSC – Loch Tummel Sailing Club
- LVSC – Loch Venachar Sailing Club
- Nairn Sailing Club
- StMLSC – St Mary’s Loch Sailing Club
- Toward Sailing Club