- 🇬🇧UHURU 10 m 232039189 — CLASS B
- 🇫🇮UISKO 12 m 230168620 — CLASS B
- 🇺🇸UISS EDM — 368926362 — —
- 🇳🇱UK322 BART DIRK — 244900055 — —
- 🇿🇦UKHOZI 31 m 601305800 9755244 DURBAN
- 🇫🇮UKKO 34 m 230946000 9230244 FIPRV, ESCORT TUG
- 🇲🇾UKUR UTARA 13 m 533134087 — CLASS B
- 🇰🇷UL SAN 101 64 m 440123810 — BUSAN
- 🇰🇷UL SAN 105 — 440108390 — B
- 🇰🇷UL SAN 107 15 m 440101460 — —
- 🇰🇷UL SAN 109 — 440144770 — B
- 🇰🇷UL SAN 305 26 m 440211280 — BUSAN
- 🇰🇷UL SAN 703 28 m · Towing vessel 440108490 — MP=USN/4.1/107/1510
- 🇰🇷UL SAN 707 — 440011460 8850839 —
- 🇰🇷UL SAN 709 30 m 440122240 — —
- 🇰🇷UL SAN HO 38 m 440144300 — —
- 🇬🇧ULIDIA 12 m 235108776 — CLASS B
- 🇵🇹ULISSES 30 m 263602563 — CLASS B
- 🇫🇮ULLA 24 m 230109460 — RAUMA
- 🇨🇦ULLAKUT 10 m 316020008 — SALLUIT
- 🇦🇿ULLUCHAY 54 m 423116100 8884593 ZIG LIMAN
- 🇵🇦ULRIKA 40 m 354242000 9572367 UMMSHAIF FIELD
- 🇰🇷ULSAN 103 26 m 440137320 — MP
- 🇰🇷ULSAN 301 — 440127370 — MOKPO
- 🇹🇭ULSAN 307 — 567003520 8619209 MAPTAPHUT,THAILAND
- 🇰🇷ULSAN 327 — 440027370 — —
- 🇰🇷ULSAN 705 — 440006990 — —
- 🇰🇷ULSAN SOONCHALHO — 440018980 — —
- 🇰🇷ULSAN6003 64 m 440200110 — —
- 🇰🇷ULSANJIWON — 440158520 — —
- 🇬🇧ULTIMATE PREDATOR — 235079911 — —
- 🇬🇼ULTRA 1 30 m 630001324 1065461 RUULU
- 🇬🇼ULTRA 2 30 m 630001347 1065473 RUULU
- 🇲🇾ULTRA JAYA 40 m 533170331 9738064 MIRI
- 🇹🇷ULTRASLAN — 271042704 — —
- 🇹🇷ULUDAG Y 23 m 271045839 9821627 GEMPORT
- 🇶🇦UM ALHOUL 3 — 466545950 — —
- 🇶🇦UM ALHOUL 4 — 466546960 — —
- 🇯🇵UME MARU NO.3 14 m 431005912 — CLASS B
- 🇿🇦UMHLALI 30 m 601161000 — —
- 🇯🇵UMIKAZE 17 m 431004604 — CLASS B
- 🇯🇵UMITAKA — 431011523 — —
- 🇯🇵UMITAKA — 431999675 — —
- 🇷🇺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 — —
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