- OBORISHTE Cargo 249742000 9415167 NOUAKCHOT
- OBOS Other 256004384 — MTMEL
- OCAT Pleasure craft 256001047 — CLASS B
- OCCITAN LISTRAC Cargo 256153000 9549372 DE HAM
- OCCITAN PAUILLAC Cargo 215362000 9483451 GI GIB
- OCCITAN PESSAC Cargo 215507000 9498286 USLCH → HRSPU
- OCEAN ANGEL Pleasure craft 256004653 1171791 ITSRE
- OCEAN CENTURY Cargo 248162000 9485033 VNHPH
- OCEAN CLUB Pleasure craft 248000668 — —
- OCEAN FUTURE Cargo 248208000 9418779 SINGAPORE
- OCEAN GLSR Cargo 229439000 9529516 BRSSZ
- OCEAN MERCURY Pleasure craft 249333000 1009560 MONACO YCM
- OCEAN ONE Pleasure craft 256832000 — CLASS B
- OCEAN PARADISE Pleasure craft 229785000 9636424 FLISVOS
- OCEAN PERA Cargo 256978000 9712955 SG SIN
- OCEAN ROYAL Cargo 248209000 9465150 IN KAK
- OCEAN SOULMATE Sailing 256003008 — CLASS B
- OCEAN SUITE Sailing 256004061 — CLASS B
- OCEAN SWAN Sailing 256003025 — CLASS B
- OCEAN ZENON Cargo 248563000 9427029 RIO GRANDE,BR
- OCEANIC Other 249903000 9703382 PLEASE KEEP 1 NM CPA
- OCEANIC 143 Cargo 256830000 1053547 UNIVERSAL MARINE CEN
- OCEANS FOUR Pleasure craft 248362000 9818022 LAST UPDATE TIME
- OCHO Sailing 249368000 — PALMA
- OCTOPUSSY 7 Pleasure craft 229000305 — CLASS B
- ODESSA Tanker 229070000 9633458 FOR ORDERS
- ODYSSEY III Other 248170000 — CLASS B
- ODYSSEY INSIGHT Sailing 256000618 — CLASS B
- OFFSHORE PHANTOM Special purpose 256004860 — COGOLIN
- OFFSHORE PROGRESS High-speed craft 256004628 — GENOVA BREAKWATER
- OHANA I Pleasure craft 256003676 — CLASS B
- OHIO Special purpose 248000285 — CLASS B
- OKABE Pleasure craft 215000399 — CLASS B
- OKEANOS Sailing 256001825 — —
- OKINAWA Sailing 249232000 — CLASS B
- OKKO Pleasure craft 248486000 9660401 FR CEQ
- OKOLCHITSA Cargo 215662000 9841653 COSMR
- OKSANCHIK Pleasure craft 248535000 17920 ANTIBES
- OLAF Pleasure craft 256908000 — ANTIBES
- 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
- ONE Sailing 256003844 — CLASS B
- ONE BLUE Pleasure craft 248000196 — DUBROVNIK
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