| Oberon |
John Keggie |
Dunstaffnage, Argyll & Bute |
  |
| Ocean Crusader |
Mickor Dennis |
Bridlington, East Riding of Yorkshire |
|
| Ocean Star |
Ray Spotswood |
Birkenhead, Merseyside |
|
| Ocean Warrior 3 |
Dave Elliott |
Newhaven, East Sussex |
  |
| Ocean-Pearl II |
Ernie Garner |
Newhaven, East Sussex |
|
| UPDATEDOffshore Rebel |
Paul Whittall |
Weymouth, Dorset |
|
| On A Promise |
David Thompson |
Berwick-upon-Tweed, Northumberland |
|
| On Yer Marks |
Ian Burrett |
Luce Bay, Dumfries & Galloway |
|
| On Yer Marks Too |
Ian Burrett |
Luce Bay, Dumfries & Galloway |
|
| Onamission |
Malcolm Collins |
Poole, Dorset |
|
| NEWOrca |
Albert Hartgen |
Minehead, Somerset |
|
| Osiris |
Tim Wilson |
Grimsby, Lincolnshire |
|
| Osprey |
Ray Spotswood |
Rhyl, Denbighshire |
|
| Osprey |
Steve Webber |
Minehead, Somerset |
|
| Our Freda |
(name unknown) |
Bridlington, East Riding of Yorkshire |
|
| Our Gemma |
Merve Minns |
Poole, Dorset |
|
| Our Joe-L |
Simon Pedly |
Paignton, Devon |
|
| Our Joy |
Vernon & Daniel Parker |
Littlehampton, West Sussex |
|
| Out Rage |
Rod Thompson |
Weymouth, Dorset |
|
| Outlaw |
Jim Davis |
Dartmouth, Devon |
|
| Outrider 2 |
Mick Mckenna |
Anglesey, Isle of Anglesey |
|