- 🇺🇸JACKY LYN 221 m 368503820 — US^07WJ → 07ZL
- 🇩🇰JACOB FREDERIKSEN 18 m · Search and rescue vessel 219031428 — ANHOLT
- 🇸🇪JACOB HAGG Dredger 265291000 7922879 HYDRO SURVEY
- 🇦🇺JACOBS WELL RESCUE 2 Search and rescue vessel 503058580 — CLASS B
- 🇫🇷JACQUES CHEVALLIER 194 m · Law enforcement vessel 227818200 — —
- 🇺🇸JACQUES-IMO 116 m 368272090 — BOLIVAR ROADS
- 🇩🇪JADE 30 m · Law enforcement vessel 211286490 9199165 SURVEY OPP.
- 🇺🇸JADWIN 124 m · Dredger 369999000 — —
- 🇧🇪JAGUAR 39 m · Dredger 205660910 — VISE
- 🇪🇸JAK DOS 18 m · Anti-pollution vessel 225987164 — BARCELONA
- 🇪🇸JAK UNO 27 m · Anti-pollution vessel 225987163 — BARCELONA
- 🇫🇮JAKUP 25 m · Dredger 230176980 — —
- 🇺🇸JAMES A MORAN 29 m 367509850 9618874 CHARLESTON
- 🇺🇸JAMES D 14 m · Dredger 367761880 — CLASS B
- 🇺🇸JAMES DALE ROBIN 28 m 367615130 — VALERO PORT ARTHUR
- 🇺🇸JAMES DAVISON 210 m 367505050 — US^08NN
- 🇺🇸JAMES E JACKSON 156 m 368236120 — US^0YA9 → 07EZ
- 🇺🇸JAMES F NEAL 350 m 366963420 — US^0AYL → 0Q1U
- 🇺🇸JAMES GOLDING 119 m 367580620 — ITC DEERPARK
- 🇺🇸JAMES H HUNTER 221 m 367311840 — USBNA
- 🇺🇸JAMES L HAMILTON 164 m 366963470 — US^0W6S → 0X9V
- 🇬🇧JAMES M 19 m · Port tender 232003758 — CLASS B
- 🇺🇸JAMES MURPHY 14 m 367757680 — NEALE
- 🇩🇪JAN 44 m · Dredger 211555420 8710766 DREDGER
- 🇳🇱JAN 34 m · Dredger 244039925 — MOERDIJK
- 🇨🇾JAN LEEGHWATER 96 m · Dredger 210522000 9516650 GBBEL
- 🇳🇱JAN VAN DER HEYDE 4 18 m · Search and rescue vessel 244030134 — AMSTERDAM
- 🇳🇱JAN VAN GENT 41 m · Dredger 244199000 9068586 ROTTERDAM
- 🇸🇲JAN VAN GENT (GUARD) 37 m · Search and rescue vessel 268244902 8410093 IJMUIDEN NETHERLANDS
- 🇺🇸JANE ANN BLESSEY 117 m 366812830 8635576 JEFFERSON REFINERY B
- 🇺🇸JANE MERRICK 205 m 367620420 — PELICAN FLEET HOUSTO
- 🇬🇮JANET 15 m · Port tender 236111549 — CLASS B
- 🇰🇷JANGMOK1 44 m · Law enforcement vessel 440002680 — BUSAN
- 🇺🇸JANIS ELIZABETH 205 m 368077290 — PBF CHALMETTE
- 🇳🇱JANNY 26 m · Dredger 244070835 — VEENDAM
- 🇳🇱JANUS Dredger 244700750 — MAASSLUIS
- 🇫🇷JANUS 2 Dredger 228351800 8985995 FR MRS
- 🇵🇦JAQUETON 19 m · Port tender 370965000 — —
- 🇺🇸JARED PHILLIPS 101 m 368176260 — US^0W6X → 0KAG
- 🇸🇪JARL 13 m · Port tender 265671980 — CLASS B
- 🇩🇪JASKO 26 m · Dredger 211282470 — DRILLING OPERATION
- 🇺🇸JASON BELCHER 160 m 368252890 — US^0CZ8 → 0TUC
- 🇺🇸JASON E. DUTTINGER 175 m 367556630 9645592 CJF
- 🇺🇸JASON GOLDING 211 m 368138170 — US^0SE5 → 0XER
- 🇺🇸JASON LIVINGSTON 148 m 368355450 — US^08PW → 0E9A
- 🇺🇸JASON MCDANIEL 315 m 367398790 — USCGK → USMEM → USCGK
- 🇺🇸JASON W. NYBERG 349 m 367582150 — US^0B2H → 0R6X
- 🇺🇸JASPER BLESSEY 83 m 366971520 8992144 LBC BAYPORT
- 🇸🇬JASPER COSMOPOLITAN 105 m · Pilot vessel 563633000 8755168 CLASS B
- 🇱🇷JASPER COSMOPOLITAN 105 m · Pilot vessel 636024437 8755168 —
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