- ONYX Sailing 218046540 — —
- OONA Pleasure craft 211133390 — CLASS B
- OOP Sailing 211813910 — CLASS B
- OORTKATEN Passenger 211462080 — HAMBURG
- OOSTENWIND Pleasure craft 211594870 — —
- OP JOECK Pleasure craft 211118890 — —
- OP JUECK Sailing 211808540 — —
- OPAKI Pleasure craft 211789510 — —
- OPAL Sailing 211212840 — —
- OPAL Other 211510470 — NLAMS00221HRBAR00011
- OPAL Pleasure craft 211870600 — —
- OPEN MIND Sailing 211106090 — —
- OPEN SEASON Sailing 218014340 — —
- OPENMINDED Pleasure craft 211110470 — CLASS B
- OPENTOBE Pleasure craft 211129930 — CLASS B
- OPHELIA Pleasure craft 211396720 — —
- OPHELIA Pleasure craft 211841180 — —
- OPHIRA Pleasure craft 211204760 — CLASS B
- OPOMA Other 211884630 — —
- OPPELN Passenger 211445200 — NOK
- OPTIE Pleasure craft 218040630 — CLASS B
- OPTIMIST Sailing 211683940 — —
- OPUA Sailing 211862830 — —
- OPUS 1 Pleasure craft 211345590 — —
- ORA Sailing 211627280 — CLASS B
- ORANIA Cargo 211505440 — GELSENKIRCHEN
- ORANJE NASSAU Passenger 211534110 — BLN STADTRUNDFAHRT
- ORAO III Pleasure craft 211178340 — —
- ORBIT Sailing 211776970 — —
- ORCA Pleasure craft 211037987 — —
- ORCA Pleasure craft 211100280 — —
- ORCA Sailing 211133720 — —
- ORCA Pleasure craft 211332640 — —
- ORCA Pleasure craft 211357200 — —
- ORCA Sailing 211384160 — —
- ORCA Cargo 211506980 — BRUNSBUTTEL
- ORCA Fishing 211523960 — CLASS B
- ORCA Pleasure craft 211735350 — —
- ORCA Pleasure craft 211784170 — —
- ORCA Pleasure craft 211788250 — CLASS B
- ORCA Tug 211834110 — —
- ORCA TEN BROKE Passenger 211781370 — BERLIN
- ORCHIDEE Pleasure craft 211828060 — CLASS B
- OREADE Sailing 211400640 — —
- OREIA Pleasure craft 211523290 — —
- ORFE Other 211229440 — HEILIGENHAFEN
- ORFEO Pleasure craft 218017290 — —
- ORIENTIS Cargo 211512900 — —
- ORINOCO Sailing 211802670 — CLASS B
- ORINOCO Sailing 218027490 — —
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