- 🇩🇪JOSEF LANGEN 34 m · Dredger 211586690 — BRODENBACH
- 🇪🇸JOSEFA PEREZ 60 m · Dredger 224002330 — BARCELONA
- 🇺🇸JOSEPH DOYLE 44 m · Law enforcement vessel 338926433 — —
- 🇺🇸JOSEPH K PATE 223 m 367399880 — US^0B5P → 0EEM
- 🇺🇸JOSEPH MERRICK JONES 410 m 367456840 — US^0X0S → 0DA4
- 🇺🇸JOSEPH PATRICK ECKST 348 m 367638130 — US^0CSD → 0R6X
- 🇱🇺JOSEPH PLATEAU 191 m · Dredger 253533000 9619000 ESFRO
- 🇺🇸JOSEPH ROY DEE 361 m 367636460 — US^0EET → 0WW5
- 🇺🇸JOSEPHINE 130 m 368051050 9862762 US JAX
- 🇺🇸JOSEPHINE DEVALL 115 m 367480070 — US^09V6 → 0UW2
- 🇺🇸JOSSET 109 m 366841020 — US^0SN8 → 0QBX
- 🇺🇸JOYCE MAXINE 115 m 367100060 — US^0SPY → 04V9
- 🇺🇸JP BOISSEAU 56 m · Dredger 366909730 233000000 —
- 🇸🇬JPO DELTA 15 m · Diving support vessel 563069780 — CLASS B
- 🇸🇬JPO FOCUS 19 m · Diving support vessel 563077390 — CLASS B
- 🇨🇦JSCA RESCUE HURRICAN Search and rescue vessel 316006785 — CLASS B
- 🇺🇸JUAN DE FUCA 23 m · Pilot vessel 366824910 — PORT ANGELES PILOT
- 🇺🇸JUAN SEGUIN 24 m · Pilot vessel 368446020 — GULF OF AMERICA
- 🇺🇸JUDITH ELLEN 119 m 367171930 — US^08BZ → 10CY
- 🇨🇦JUDY LAMARSH 66 m · Search and rescue vessel 316050643 9560120 ATON
- 🇩🇪JUELSSAND 41 m · Dredger 211443180 — WSA ELBE NORDSEE
- 🇩🇪JUERGEN HORST 8 m · Search and rescue vessel 218016620 — SAR ON DUTY
- 🇳🇴JUGGERNAUT 8 m · Noncombatant ship 257093750 — CLASS B
- 🇺🇸JULEANN TORRENCE 148 m 368279270 — JACKSON, AL.
- 🇺🇸JULIA A HARRISON 2 24 m 368046120 — FELLENBE
- 🇺🇸JULIA MILLER 9 m · Port tender 367113110 — —
- 🇵🇱JULIAN 77 m · Dredger 261011547 8302739 USTKA
- 🇺🇸JULIE GONSOULIN 205 m 367332910 — US^0D65 → 0U0B
- 🇳🇴JULIE SOFIE 15 m · Dredger 257889500 — TORSKEN
- 🇺🇸JULIEN DUBUQUE 17 m 366986450 — —
- 🇲🇹JULIET 1 15 m · Pilot vessel 229000570 — CLASS B
- 🇨🇴JULIETA 8 m · Pilot vessel 730152951 — —
- 🇩🇰JULIETT 0901 9 m · Law enforcement vessel 219033988 — CLASS B
- 🇧🇪JULIETTE 21 m · Dredger 205326590 — BERINGE
- 🇺🇸JULIUS HUNTER Dredger 367099750 — —
- 🇨🇳JUN HAI 5 131 m · Dredger 413472070 9620035 GUANG ZHOU
- 🇨🇳JUN HAI 6 130 m · Dredger 413472940 9620047 NKC-MRT
- 🇺🇸JUNE POINT 12 m · Dredger 368491830 — CLASS B
- 🇳🇱JUNO 22 m · Dredger 244770861 — —
- 🇦🇺JUPB2 18 m 503022260 — —
- 🇬🇧JUPITER 6 m · Diving support vessel 232010937 — CLASS B
- 🇯🇵JUPITER 18 m · Pilot vessel 431016243 — CLASS B
- 🇬🇧JURA 84 m · Law enforcement vessel 235010460 9319624 HULL
- 🇺🇸JUSTIN PAUL ECKSTEIN 178 m 367638030 — US^0E7P → 0D3V
- 🇲🇭JUZOR 59 m · Port tender 538006350 9504671 DDW - SEA TRIALS
- 🇫🇷JVLR MEDITERRANEE 36 m · Noncombatant ship 228213900 9334260 SETE
- 🇹🇼K 733 12 m · Anti-pollution vessel 416013306 — KEELUNG
- 🇩🇰K B REDNING 1 Search and rescue vessel 219020206 — —
- 🇳🇱K&S ARGUS 11 m · Diving support vessel 244004475 — CLASS B
- 🇦🇺K.E.TALBOT 11 m · Search and rescue vessel 503149750 — —
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