- OIRASEMARU Tug 431100911 — CLASS B
- OITA Passenger 431501774 9282560 JP YWH USK
- OITA MARU Cargo 431209000 9398151 BRPMA
- OKADAMARU Fishing 431017338 — CLASS B
- OKESA-MARU Passenger 431000001 9052616 JP KIJ WB
- OKI Tug 431008718 9801378 JP SMN
- OKIAIMARU 2 Fishing 431031358 — CLASS B
- OKIHARUMARU Cargo 431400181 9058505 JP UBJ OFF/E
- OKIHATAMARU Fishing 431018826 — CLASS B
- OKIKENN MARU NO.3 Tug 431013972 — CLASS B
- OKINAWA Tug 431701000 8622270 ISGOFF
- OKINOSHIMA Passenger 431021172 — CLASS B
- OKISHIMA Tug 431010052 — JP HIJ
- OKISHIO SURVEYVESSEL Tug 431680164 — CLASS B
- OKISHO MARU NO.1 Cargo 431005942 9724221 JP KNX SASHIKI
- OKISYO MARU NO7 Cargo 431018746 — JP KNX KUBASAKI
- OKITAMA MARU NO.2 Tanker 431004883 9690341 JP CHB XX
- OKITSU MARU Fishing 431013517 — CLASS B
- OKITSU MARU Tug 431014667 — CLASS B
- OKUNI MARU Cargo 431004341 9674490 JP-HESAKI
- OLA LEA Pleasure craft 431016117 — CLASS B
- OLIVE Pleasure craft 431013475 — CLASS B
- OLIVE MARIN Passenger 431015783 — CLASS B
- OLIVE SEVEN Pleasure craft 431013812 — CLASS B
- OLIVE-MARU-NO.3 Passenger 431003439 9676436 SHIKAMA → = → FUKUDA
- OLIVE-MARU-NO.5 Passenger 431005301 9759094 SHIKAMA → = → FUKUDA
- OLIVIA 2 Pleasure craft 431028097 — —
- OLMPIA DREAM Passenger 431402019 8998526 JP OKP → = → TNO
- OLYMPIA DREAM SETO Passenger 431013064 8998526 JP TAP
- OLYMPIAN HIGHWAY Cargo 431651000 9757993 IN ENR → ZA DUR
- OMEGA 2 Pleasure craft 431022355 — CLASS B
- OMEGA3 Tanker 431009801 9809291 JP KKO
- ON SHORE 3 Fishing 431025838 — CLASS B
- ON18 TAKAMARU Fishing 431013486 — CLASS B
- ONAMI NO.3 Cargo 431602223 — CLASS B
- ONAMI NO.5 Cargo 431011258 9835472 JP TYO OFF
- ONAMI NO.6 Cargo 431014802 9924833 JP HIJ OFF
- ONDINE6 Pleasure craft 431003391 — —
- ONDO 2000 Tug 431401826 — —
- ONE ALTAIR Cargo 431710000 9468308 PAPCA
- ONE APUS Cargo 431003000 9806079 KRPUS → THLCH
- ONE BLUE JAY Cargo 431080000 9741372 US NYC
- ONE COLUMBA Cargo 431655000 9806055 CNYTN
- ONE COMMITMENT Cargo 431332000 9629902 JP TYO O
- ONE COMPETENCE Cargo 431315000 9339662 MXESE
- ONE CONTRIBUTION Cargo 431225000 9629914 KR PUS
- ONE CYGNUS Cargo 431073000 9806081 LKCMB → USNYC
- ONE EAGLE Cargo 431552000 9741396 PA MIT
- ONE FALCON Cargo 431792000 9741425 KRPUS
- ONE GRUS Cargo 431654000 9806067 CN ZOS
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