- OKOLCHITSA Cargo 215662000 9841653 COSMR
- OKSANCHIK Pleasure craft 248535000 17920 ANTIBES
- OLAF Pleasure craft 256908000 — ANTIBES
- OLGA V Pleasure craft 215000867 — —
- OLINDA Pleasure craft 256001706 — CLASS B
- OLIO Pleasure craft 249921000 — ALTEA
- OLIVER Other 256004557 — —
- OLIVIA O Pleasure craft 215708000 9818797 CANARY ISL
- OLIVIUM Pleasure craft 256005206 — CLASS B
- OLWYN Sailing 256001489 — CLASS B
- OM Pleasure craft 249991000 9820037 VIAREGGIO
- OMBRE BLU 3 Sailing 229000120 — CLASS B
- OMNIA1 Pleasure craft 256635000 9796638 GOLFEJUAN
- ONDA BLU Pleasure craft 256000929 — —
- ONDINE Pleasure craft 215000909 — —
- ONE Sailing 256003844 — CLASS B
- ONE BLUE Pleasure craft 248000196 — DUBROVNIK
- ONE LIFE. LIVE IT Sailing 256002491 — —
- ONE SHOT Sailing 215000989 — CLASS B
- ONE SIXTEEN Pleasure craft 229000823 — CLASS B
- ONE XS Sailing 256003804 — CLASS B
- ONEIRO I Pleasure craft 249561000 1129619 NAPOLI
- ONLY ONE I Pleasure craft 229000488 — CLASS B
- ONLY US Pleasure craft 256005287 — CLASS B
- ONNELLA Fishing 256000318 8564143 CLASS B
- ONTIME Pleasure craft 256783000 — CLASS B
- ONUR G A Cargo 215424000 9238076 TRYAL
- ONYX Tug 256159000 9752400 MTMAR
- OOSA Pleasure craft 256004163 — CLASS B
- OP Pleasure craft 256002594 — CLASS B
- OP Pleasure craft 256003458 — CLASS B
- OPAL Tug 248219000 9489479 TRALI
- OPALINE Cargo 248701000 9424869 BEZEE
- OPARI Pleasure craft 215745000 9840829 PIRAEUS
- OPTASIA Pleasure craft 248704000 9822762 M. ZEAS
- OPTIMIST Pleasure craft 256000662 — CLASS B
- OPTIMUS S Tanker 215825000 9291573 FRLAV
- OPTION B Pleasure craft 248365000 8794164 MARINA FLISVOS
- OPUS Pleasure craft 256001441 — —
- ORA Pleasure craft 256139000 9444572 MARINA ZEA
- ORANGE HARMONY Cargo 248358000 9764099 MZ MNC
- ORCA I Pleasure craft 256003774 — CLASS B
- ORDU Cargo 215676000 9584047 ZA RCB
- OREGON Cargo 229422000 9721683 IN JGD
- OREOS Pleasure craft 256509000 — VALLETTA
- OREOS II Pleasure craft 256003545 — —
- ORIENS NOVUS Pleasure craft 248536000 9158161 CLASS B
- ORIENT STAR Pleasure craft 248838000 9657703 DIDIM
- ORION Pleasure craft 256002151 — CLASS B
- ORION JESSICA Tanker 256512000 9917543 FOR ORDERS
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