- OLM Tug 211538260 — UNTERHALTUNG EHK
- OLMO Other 211638970 — —
- OLSBORG Special purpose 211177560 — —
- OLSY Pleasure craft 211187980 — —
- OMABINE Sailing 211333780 — —
- OMAUNDOPA Pleasure craft 211361850 — —
- OMNIA Pleasure craft 218010230 — —
- ON THE ONE Sailing 211884210 — —
- ON THE ROCKS Sailing 211106800 — CLASS B
- ON TOP Sailing 211198800 — —
- ON Y VA Sailing 211794330 — CLASS B
- ON Y VA Sailing 211891010 — LAVRION
- ONDINA Sailing 211517180 — —
- ONDINA Pleasure craft 211544160 — —
- ONDINE Pleasure craft 218062650 — —
- ONE Pleasure craft 211147680 — —
- ONE Sailing 218027590 — —
- ONE LOVE Sailing 211392190 — —
- ONE MORE TOY Pleasure craft 211123660 — CLASS B
- ONE OF US Sailing 211138800 — CLASS B
- ONE PIECE Sailing 211851050 — CLASS B
- ONE SPIRIT Pleasure craft 211755340 — CLASS B
- ONE Y ONE Pleasure craft 211261530 — —
- ONEIRA Sailing 211387340 — CLASS B
- ONELIFE Pleasure craft 218055650 — —
- ONEWIND Other 211530370 — —
- ONGUMA Pleasure craft 211885480 — —
- ONIDA High-speed craft 211816810 — —
- ONION Tanker 211285540 — ANTWERPEN
- ONIYANMA Pleasure craft 211125620 — —
- ONKEL OTTO Cargo 211270860 886295900 LANGEOOG BENSERSIEL
- ONLY YOU Pleasure craft 211361040 — —
- ONNI Sailing 211669640 — —
- ONO Sailing 211214920 — CLASS B
- ONSEO Sailing 211770260 — CLASS B
- ONWA18 Sailing 218181818 — —
- ONWATER III Pleasure craft 211843550 — CLASS B
- ONYROS Sailing 211199540 — —
- ONYX Sailing 211243410 — —
- ONYX Sailing 211306460 — —
- ONYX Sailing 211627950 — —
- ONYX Sailing 211882230 — —
- 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 — —
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