- 🇺🇸JESSE PACHECO JR 12 m · Search and rescue vessel 338152420 — —
- 🇺🇸JESSICA MARIE 21 m · Dredger 367646240 — PASCAGOULA MISS
- 🇺🇸JESSIE 46 m 338091124 — —
- 🇳🇱JETSED 37 m · Dredger 245443000 8804505 BONNY RIVER
- 🇳🇱JETSTREAM 9 m · Search and rescue vessel 244690346 — CLASS B
- 🇩🇰JETTE SAJ 32 m · Dredger 219001362 9019016 DKSJO
- 🇨🇦JETTI RESCUE CTOW 7 m · Search and rescue vessel 316058495 — CLASS B
- 🇦🇺JETWAVE BLUEY 10 m · Port tender 503094980 — CLASS B
- 🇦🇺JETWAVE LOLA 11 m 503180880 — CLASS B
- 🇦🇺JETWAVE NIKITA 7 m · Diving support vessel 503202720 — —
- 🇦🇺JETWAVE STANLEY PT 9 m · Port tender 503123590 — —
- 🇦🇺JETWAVE WAIKARE 16 m · Pilot vessel 503180030 — CLASS B
- 🇸🇪JEWEL 5 m · Search and rescue vessel 265669960 — LANGEDRAGMARINE.SE
- 🇺🇸JEZEBEL Diving support vessel 338501756 — —
- 🇨🇳JIA HONG 9 65 m · Dredger 413462060 — ZHU HAI
- 🇨🇳JIA NUO 1 106 m · Dredger 413457510 — BA SUO
- 🇸🇱JIAHE 99 139 m · Dredger 667002385 1090698 SINGAPORE
- 🇹🇼JIANG NAN NO.2 13 m · Port tender 416013662 — KEELUNG TW
- 🇫🇷JIF PATROL 1 14 m · Search and rescue vessel 228060800 — CLASS B
- 🇫🇷JIF PATROL 4 9 m · Port tender 228034390 — CLASS B
- 🇦🇺JIM PEEL 15 m · Port tender 503315100 — CLASS B
- 🇰🇷JIMIN 101 30 m · Anti-pollution vessel 440122540 8965282 BUSAN
- 🇲🇳JIMIN 101 30 m · Anti-pollution vessel 457900978 8965282 BUSAN
- 🇨🇳JING SHENG 598 87 m · Dredger 413302940 — YAN WEI GANG
- 🇬🇧JLA JERSEY LIFEBOAT 13 m · Search and rescue vessel 232003197 — —
- 🇬🇧JLA-02 ALBERT PINEL 9 m · Search and rescue vessel 232036698 — CLASS B
- 🇫🇷JLD ABBY 16 m · Pilot vessel 227010710 — —
- 🇳🇱JO 27 m · Dredger 244110744 — —
- 🇺🇸JOAN PLUCK 113 m 368410260 1352015 US^070U → 0QS0
- 🇵🇹JOAO VAZ CORTE-REAL 12 m · Pilot vessel 204671270 — CLASS B
- 🇺🇸JOCK CENAC 213 m 368413610 — US^07U1 → 0C4V
- 🇺🇸JOE B WARD 175 m 367702220 — USWKS → USBTR
- 🇺🇸JOE B. WYATT 352 m 366961530 100647464 US^11SG → 0DNK
- 🇬🇧JOE BREEN 15 m 232045725 — CLASS B
- 🇺🇸JOE CAIN Pilot vessel 367004760 657662 —
- 🇺🇸JOE DERBAS 87 m 368437390 — XX XXX → US^0RL7
- 🇳🇿JOE HAWKE RESCUE 9 m · Search and rescue vessel 512008077 — CLASS B
- 🇺🇸JOE LOCHRICO 208 m 367772180 — US^09K9 → 06NQ
- 🇺🇸JOE RAY BEAUBOUEF 115 m 367079510 — ENTERPRISE BEAUMONT
- 🇺🇸JOEL SMITH 84 m 366874960 8644424 HOUSTON
- 🇳🇱JOEY 20 m · Dredger 244290160 — —
- 🇸🇪JOHAN 18 m · Diving support vessel 265628610 — CLASS B
- 🇸🇪JOHAN MANSSON 20 m · Dredger 265500670 — HYDROGRAPHIC SURVEY
- 🇩🇪JOHANN FIDI 8 m · Search and rescue vessel 211235250 — —
- 🇳🇱JOHANNA JOSEPHINE 34 m · Dredger 244647000 8650801 DELFZIJL
- 🇳🇱JOHANNA LOUISA 20 m · Search and rescue vessel 245446000 — IJMUIDEN
- 🇩🇰JOHANNE_3 Port tender 220053927 256 —
- 🇮🇸JOHANNES BRIEM 17 m · Search and rescue vessel 251858640 — INFO ON VHF CH16
- 🇺🇸JOHN 3:16 114 m 367443920 8975835 XX XXX → US^0ZAZ
- 🇺🇸JOHN AB DILLARD 27 m · Port tender 368423740 — —
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