- 🇷🇺UMKA 80 m 273397740 9171620 RU KHO
- 🇶🇦UMM AL SHUBRUM 28 m 466410000 9704386 GB102
- 🇦🇪UMM KHORAH 45 m 470451000 9593579 AL HAYL ISLAND
- 🇶🇦UMM SLAL 28 m 466574800 9655614 —
- 🇦🇪UMM-AL-ANBER 133 m 470441000 7206330 OM SLL → SO MGO
- 🇳🇬UMTWALUME — 657982750 7615921 PORT HARCURT
- 🇿🇦UMVOTI 26 m 601118000 — —
- 🇺🇸UNALAQ 46 m 338718000 9765732 HOMER
- 🇺🇸UNCLE BILL 8 m 338390719 — CLASS B
- 🇺🇸UNCLE BUD 18 m 366995360 — US^0ZWT → 0WZQ
- 🇺🇸UNCLE CALIE 15 m 368328130 — POR
- 🇺🇸UNCLE GEORGE 20 m · Towing vessel 367656430 — US^0QFY → 0YFP
- 🇺🇸UNCLE JOE 18 m · Towing vessel 368092790 — PORT OF IBERIA
- 🇺🇸UNCLE MIKE 20 m 367712350 — US^0Q3T → 0NP9
- 🇺🇸UNCLE NU 16 m · Towing vessel 367009460 — PORT OF NEWIBERIA
- 🇨🇦UNDAUNTED 14 m 316018090 — —
- 🇺🇸UNDAUNTED 150 m · Towing vessel 366578000 8963210 CALCITE
- 🇦🇺UNGARRA — 503305600 — —
- 🇰🇷UNGBI3HO — 440076570 — —
- 🇦🇪UNI EXPLORER SAHIM — 471501000 — —
- 🇦🇪UNI EXPLORER SAIFAN — 471195000 — —
- 🇹🇭UNI EXPRESS 13 36 m 567344000 9525077 SONGKHLA
- 🇹🇭UNI EXPRESS 14 — 567345000 9525089 FUNAN FIELD
- 🇳🇴UNI FEMUNDEN — 258233500 — —
- 🇳🇴UNI ROROS — 257492500 — —
- 🇱🇰UNICORN 1 20 m 417222486 — SRI LANKA
- 🇸🇬UNIDIVE 12 — 563086940 — —
- 🇹🇭UNIEXPRESS 10 — 567347000 9525041 SKL
- 🇹🇭UNIEXPRESS 12 — 567353000 9525065 SONGKHLA
- 🇹🇭UNIEXPRESS 15 36 m 567367000 9554377 SKL
- 🇹🇭UNIEXPRESS 17 — 567387000 9564293 SATAHIP
- 🇹🇭UNIEXPRESS 19 — 567399000 9590462 SKL
- 🇹🇭UNIEXPRESS 22 38 m 567062500 9671905 SKL
- 🇹🇭UNIEXPRESS 23 — 567062600 9671917 —
- 🇹🇭UNIEXPRESS 24 38 m 567062700 9671929 SKL
- 🇹🇭UNIEXPRESS 25 40 m 567512000 9770244 WP58
- 🇹🇭UNIEXPRESS 27 42 m 567605000 9951458 HXL
- 🇹🇭UNIEXPRESS 9 — 567346000 9525039 THSGZ
- 🇮🇳UNIGLORY — 419956678 — CLASS B
- 🇨🇾UNION ONYX 33 m 212163000 9406415 NLRTM
- 🇲🇾UNION STAR 1 — 533170014 9349851 —
- 🇨🇳UNION STELLA 78 m 412551210 1097000 ZHEN JIANG SEA TRAIL
- 🇨🇾UNION TOPAZ 33 m 212165000 9406427 NLWAL
- 🇳🇱UNIQUE NAZ — 244860429 — —
- 🇮🇩UNITAMA 15 20 m 525007274 8873611 GRESIK
- 🇮🇩UNITAMA 18 20 m 525007275 8874835 KOKAS
- 🇮🇩UNITED 2022 27 m 525501106 — CLASS B
- 🇮🇩UNITED 2419 — 525500264 — CLASS B
- 🇮🇩UNITED XII — 525005027 — TANJUNG BATANG
- 🇹🇭UNITEDKING 55 F3 26 m 567000055 — CLASS B
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