- 🇺🇸J.S.ST.JOHN 51 m · Dredger 367348910 5202524 ERIE,PA
- 🇺🇸J.W. HUNTER 168 m 367610280 — US^0CBM → 0TWZ
- 🇺🇸J0 ANN EDWARDS 18 m 366874950 8644412 —
- 🇩🇰J0501 10 m · Law enforcement vessel 219033776 — —
- 🇵🇦J0LLY RAMONA 13 m · Port tender 354011000 — CLASS B
- 🇺🇸JAB 13 m · Diving support vessel 368114560 — —
- 🇺🇸JACIE E 158 m 368034940 — LM115
- 🇺🇸JACK BINION 206 m 367344920 — CALCASIEU REFINERY
- 🇧🇷JACK EDWARDS 100 m 710007494 9530008 STENA CARRON —
- 🇺🇸JACK JAMES 287 m 367681150 — US^0EAT → 0E8P
- 🇺🇸JACK NASH 208 m 368343550 1340414 US^06P2 → 0QF6
- 🇺🇸JACK RICHARD 173 m 367703080 — US^06KW → 0SW9
- 🇦🇺JACK UP BARGE 4 22 m 503022270 — —
- 🇺🇸JACKIE 207 m 367050250 — US^0ZP3 → 0QWE
- 🇺🇸JACKIE ENGLERT 40 m 367430330 — US^0CS4 → 0TQU
- 🇺🇸JACKIE GONSOULIN 22 m 367332930 — SOUTHERN FLT CORPUS
- 🇺🇸JACKSON FOSTER 82 m 368148790 — US^0YK9 → 0Y6T
- 🇺🇸JACKSON III 156 m 367694480 — US^0FFK → 0JFA
- 🇺🇸JACKY L. O'NEAL 483 m 367530760 — USCSX → USCEN
- 🇺🇸JACKY LYN 220 m 368328420 57000000 US^07WJ → 07ZL
- 🇺🇸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 — US^0DDW → 06L6
- 🇺🇸JAMES DAVISON 210 m 367505050 — US^08NN
- 🇺🇸JAMES E JACKSON 156 m 368236120 — US^0YA9 → 07EZ
- 🇺🇸JAMES F NEAL 350 m 366963420 100645834 US^0AYL → 0Q1U
- 🇺🇸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 MERRICK 205 m 367620420 125140200 PELICAN FLEET HOUSTO
- 🇬🇮JANET 15 m · Port tender 236111549 — CLASS B
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