- OSA Pleasure craft 232052753 — —
- OSCAR OWL Tug 235089479 — CLASS B
- OSCAR'S SPIRIT Pleasure craft 235026879 — —
- OSEA Sailing 232052178 — CLASS B
- OSIRIS Pleasure craft 235013721 — —
- OSO BLANCO Other 232039354 — —
- OSPREY Pleasure craft 232010225 — —
- OSPREY Special purpose 232042584 — —
- OSPREY Pleasure craft 232046243 — —
- OSPREY Pleasure craft 232066286 — —
- OSPREY Pleasure craft 232068424 — CLASS B
- OSPREY Pleasure craft 232068640 — —
- OSPREY Sailing 235035124 — CLASS B
- OSPREY Sailing 235036202 — —
- OSPREY Sailing 235060592 — —
- OSPREY Fishing 235063734 — CLASS B
- OSPREY Pleasure craft 235065107 — —
- OSPREY Sailing 235067998 — —
- OSPREY Sailing 235094009 — CLASS B
- OSPREY Sailing 235098479 — —
- OSPREY 111 Other 235062642 — —
- OSPREY BA4 Fishing 235091175 9021710 STELENDAM
- OSPREY II Other 235088177 — —
- OSPREY III Other 232053776 — —
- OSPREY JY111 Pleasure craft 232026959 — —
- OSPREY OF CLYDE Pleasure craft 232036642 — CLASS B
- OSPREY OF HORNET Sailing 235008548 — —
- OSPREY OF RAMSGATE Sailing 235005419 — CLASS B
- OSPREY WK4 Fishing 232026992 — FISHING
- OSSIAN Sailing 232052358 — CLASS B
- OSSIAN Sailing 235018131 — —
- OSSIAN WARRIOR Sailing 235054944 — —
- OSTARA Sailing 235036734 — —
- OSTARA Sailing 235090274 — CLASS B
- OSTARA OF BRISTOL Pleasure craft 232021696 — —
- OSTINATO Sailing 232055310 — —
- OSTRA A Pleasure craft 235009455 — —
- OSTRICA Sailing 235083084 — CLASS B
- OTAGO Sailing 235004307 — —
- OTAGO Pleasure craft 235084723 — —
- OTAKI Pleasure craft 232037061 — CLASS B
- OTB-01 Military 232026015 — DARTMOUTH
- OTB-06 Military 232027849 — —
- OTB-07 Military 232032487 — —
- OTESAN Sailing 232054294 — CLASS B
- OTHILA Pleasure craft 232051069 — —
- OTRA VEZ Sailing 235089351 — —
- OTTA Sailing 232050676 — —
- OTTER Other 232065641 — —
- OTTER Sailing 235083796 — —
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