- OCEAN BREEZE Tanker 255915943 9391529 EC ESM
- OCEAN CARRIER Cargo 255805917 9349435 EGALY
- OCEAN DROP Sailing 263442881 — —
- OCEAN ENDEAVOUR Passenger 255806401 7625811 SZCZECIN
- OCEAN EXPLORER Passenger 255806393 9883194 USHUAIA
- OCEAN EXPLORER Pleasure craft 263959188 — CLASS B
- OCEAN GUARDIAN Other 255744000 9761401 VIGO
- OCEAN JOY Sailing 263959258 — CLASS B
- OCEAN MAJESTY Passenger 255717000 6602898 VELSEN NOORD
- OCEAN ODYSSEY Passenger 255806392 9880673 NLVLI
- OCEAN PARTICLES 1 Fishing 263256000 — —
- OCEAN PROTECTOR Cargo 255746000 9761437 EU FISHERY PATROL
- OCEAN SENTINEL Cargo 255732000 9761425 FRTLN
- OCEAN TRADER Cargo 255805916 9349461 DZMOS
- OCEAN TRANGA Cargo 255916301 9532812 PTAVE
- OCEAN VENTURE Tanker 255916024 9660657 TRIZT
- OCEAN VICTORY Passenger 255806394 9868869 AR USH
- OCEAN7 CAMILLA Cargo 255806166 9810329 ESLPA
- OCEAN7 CARLOTTA Cargo 255806182 9810343 ESLPA
- OCEAN7 CAROLINA Cargo 255806183 9810331 YANBU
- OCEANEYE I Other 263441047 — MARINA DE ALBUFEIRA
- OCEANUS Pleasure craft 204810590 — —
- OCEANUS Cargo 255806007 9243899 JMKIN
- OCTANAS Pleasure craft 263960010 — CLASS B
- OCTOPUS Pleasure craft 204808980 — —
- ODELMAR Cargo 255915761 9773313 BR RIG
- ODIN Cargo 255805955 9101144 HULL
- ODIN 1 Tug 255916572 9492995 OFFSHORE HAIFA
- OFFSPRING Sailing 263754480 — CLASS B
- OFIGETI Sailing 263443186 — CLASS B
- OHANA'S Sailing 263442643 — CLASS B
- OJOY Sailing 263441660 — CLASS B
- OLA Pleasure craft 255912990 — —
- OLD LADY Sailing 263964000 — CLASS B
- OLD PINE Sailing 263441760 — CLASS B
- OLIM Pleasure craft 263900130 — CLASS B
- OLIVIA RIBAU Fishing 263434000 8800389 —
- OLYMPUS Tanker 255916036 9941661 CN RZH
- OMA CAROLINA Pleasure craft 204671690 — CLASS B
- OMEGA Sailing 263833750 — CLASS B
- OMVAC DOCE Special purpose 255917440 9757199 LE HAVRE FRANCE
- OMVAC EUME Special purpose 255916280 9671620 DOHAI
- OMVAC GALICIA Other 255917411 9404297 ESMGP
- ONCE UPON A TIME Sailing 255903560 — CLASS B
- ONDA AZUL Pleasure craft 263932860 — —
- ONEGO MERCHANT Cargo 255806142 9238363 SEUDD
- ONEGO TRADER Cargo 255806180 9238351 USMSY
- ONO ONE Pleasure craft 204701550 — CLASS B
- OPHELIA EXPLORER V Other 263443303 — —
- OPPLAND Cargo 255806244 9505613 ESGAR
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