May
| Date |
Event |
Location |
| 1-10 |
National Windsurfing Week |
Nationwide |
| 1 |
Sunrise Sunset Challenge |
Nationwide |
| 2 |
OnBoard Team Racing Festival |
South Cerney Outdoor Centre, Cirencester |
| 13-15 |
RIBEX 2011 |
Cowes, Isle of Wight |
| 14 |
Team15 - South West event 1 |
Sibleyback, SW Lakes Trust |
| 14 |
OnBoard - OnBoard regatta |
Derwent Water Marina, Keswick, Cumbria |
| 14 |
Honda RYA Youth RIB Championship - Thames Valley Regional Final |
Sea Cadet Boat Station, Royal Victoria Dock, London |
| 15 |
OnBoard - OnBoard Festival Circuit |
Edgbaston Reservoir, Birmingham |
| 21 |
Honda RYA Youth RIB Championship - South East Regional Final |
Dover Watersports Centre, Esplanade, Dover |
| 21 |
Team15 - Midlands event 1 |
Youth Afloat, Bartley Reservoir |
| 21-22 |
OnBoard - Cornwall Travellers Series 2 |
Stithians Lake, Redruth, Falmouth |
| 24-30 |
Delta Lloyd |
Medemblik, Holland |
| 28 |
Honda RYA Youth RIB Championship - West Midlands Regional Final |
Blithfield Sailing Club, Blithfield Reservoir |
| 28 |
Team15 - West event 1 |
Astbury Sailsports Ltd, Congleton, Cheshire |
| 29 |
Team15 - South East event 1 |
Bewl Outdoor Pursuits Centre |
| 29 |
Team15 - North event 1 |
Derwent Reservoir Sailing Club, Consett, County Durham |
| 30 |
OnBoard - 8 hour race |
Hollingworth, Littleborough |