- OCEAN'S 11 Pleasure craft 319090100 — CLASS B
- OCEAN'S SEVEN Pleasure craft 319044000 1011044 USPAB
- OCN Pleasure craft 319246800 — CLASS B
- OCTOPUS Pleasure craft 319359200 1167233 LAST UPDATE TIME
- OCTOPUS Cargo 319866000 1007213 CAPE TOWN
- ODISEA Pleasure craft 319345100 9932452 AUGOC
- ODYSSEA Pleasure craft 319143700 1011264 ST MARTIN
- ODYSSEY Passenger 319095400 — SELIMIYE
- ODYSSEY Pleasure craft 319341600 — CLASS B
- ODYSSEY Pleasure craft 319363800 9499785 GR PIR
- OFF HIRE Pleasure craft 319354600 1173567 SANREMO
- OFF THE CHAIN Pleasure craft 319184700 — —
- OFFLINE Pleasure craft 319284400 — CLASS B
- OH-COOP! Pleasure craft 319134200 — —
- OHANA Pleasure craft 319333700 — CLASS B
- OKTO Pleasure craft 319064900 1012335 US MIA
- OLYMPUS Pleasure craft 319915000 1005071 IT GOA
- OLYMPUS CHASE Pleasure craft 319329200 — CLASS B
- OMAHA Pleasure craft 319141800 9809588 MGWCA
- OMAKASE Pleasure craft 319264200 — CLASS B
- ONE Sailing 319273800 — CLASS B
- ONE AND ONLY Pleasure craft 319173800 — CLASS B
- ONE ARCADIA Cargo 319211600 9468310 US MOB → PA PCA
- ONE TRITON Cargo 319219200 9356713 USMSY → GBSOU
- ONEIRO Pleasure craft 319158700 9487809 —
- ONEIRO Pleasure craft 319358900 9996317 PALMA
- ONYXIA Other 319196700 — —
- OPERA Pleasure craft 319258700 1012933 ES BCN
- OPH Pleasure craft 319241600 — CLASS B
- OPUS Pleasure craft 319284500 — CLASS B
- ORCA Pleasure craft 319126700 — CLASS B
- ORIENTAL ACACIA Tanker 319014800 9553048 TR TUT
- ORION Sailing 319211100 — —
- ORION Pleasure craft 319314400 9972696 SXM
- ORIZZONTE Pleasure craft 319220500 9667124 MANDELIEU
- ORLY BLISS Sailing 319215500 — —
- OSTAR Pleasure craft 319354000 1006180 LA PAZ
- OSTARA Pleasure craft 319011700 9557501 FISHING
- OUI OUI Pleasure craft 319201000 1009170 ESTAR
- OUI OUI 2 Pleasure craft 319037082 — —
- OUR WAY Pleasure craft 319074000 — FLL PEV
- OURS Pleasure craft 319279700 — —
- OUT OF THE BLUE Pleasure craft 319200400 — BARCELONA
- OUTRIDER Tug 319201900 — CLASS B
- OUZEL Sailing 319330500 — CLASS B
- P1 Pleasure craft 319331800 9779915 UMC:
- PA'LANTE Pleasure craft 319356300 9994345 LA SPEZIA
- PA'LANTE V Pleasure craft 319313200 1121368 LA GRAZIE
- PACK N PLAY Pleasure craft 319342500 — CLASS B
- PALADIN Pleasure craft 319284800 9761384 BAL HARBOUR
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