| Phoenix | 5699L | Hanse 348 | YTC White Sail Cruisers | Matthew Townend |
| Parody | 8161 | Sonata | Sonata One Design | Mortimer Mastin |
| Outrageous Grace | 8254 | Albacore | Dinghy Class | Tim Coleman |
| Outburst! | GBR7393R | Elan 333 | YTC Cruisers | Rob Haigh |
| Obsession | 8370 | Sonata | Sonata One Design | Steve Phillips |
| O C | GBR 755 | Folk boat | YTC Classic Yachts & Gaffers | Drummond Sydenham |
| none | 783 | B14 | Dinghy Class | Henry Wells |
| None | 177473 | Ilca 6 | Dinghy Class | Ceri Rogers |
| Nesta | None | Gaff Cutter | YTC Classic Yachts & Gaffers | Nancy Harrisson |
| Nacho | 1378L | Beneteau First 25.7 | YTC Cruisers | Oliver Grogan |
| NA | 2242 | 29er | Dinghy Class | Frederick Wood |
| Mystery of Tollesbury | A1 | MFOB | Mersea Fisherman's Open Boats | Angela Payne |
| Moonstone 1X | 9 | Swallow Yachts Bay Cruiser 23 | YTC Classic Yachts & Gaffers | Vic Fagence |
| Mojito | GBR8680 | Ramsay 6.7m One Off | YTC Cruisers | Team Mojito |
| Mister Dinghy | 1513 | Wanderer | Dinghy Class | Stuart Mathieson |
| Mischief of Colne | 237 | Hustler 30 | YTC Cruisers | Jos Williams |
| Mexican Train | GBR1786 | Cork 1720 Sportsboat | YTC Cruisers | Alan Brook |
| Mersea Native | CK94 | MFOB | Mersea Fisherman's Open Boats | Lars/Nicky/Izi Ditchburn |
| Merlin | WM25 | MFOB | Mersea Fisherman's Open Boats | Bryan Sargeant |
| Mayfly | CK363 | Smack | Smacks | David Whiting |
| Material Girlz | 2282 | RS Feva XL | Dinghy Class | Harriet More |
| Martha 2 | MN69 | Smack | Smacks | Phil Plumtree |
| Marie | CK22 | MFOB | Mersea Fisherman's Open Boats | Paul Winter |
| Mango | 3044 | Topper Topaz Magno | Dinghy Class | Charlotte Bielecka |
| Lizzie Annie | MN23 | Smack | Smacks | Jasmin Klimcke |
