- 🇬🇧UGIE RUNNER 13 m · Port tender 235115941 — —
- 🇺🇸UGLE DUCKLING 14 m · Dredger 338158987 — —
- 🇧🇪UILENSPIEGEL 143 m · Dredger 205146000 9247467 NDAYANE DREDGING OPS
- 🇳🇱UK 264 — 244044226 — —
- 🇬🇧UKD BLUEFIN 98 m · Dredger 232002803 9143427 GBSOU
- 🇬🇧UKD CHERRY SAND 63 m · Dredger 232003994 6811059 LOWESTOFT
- 🇬🇧UKD MARLIN 81 m · Dredger 232001610 9064176 GR NGEMOUTH
- 🇬🇧UKD ORCA 78 m · Dredger 235077712 9491355 HUMBER
- 🇬🇧UKD RESOLUTION 6 m · Dredger 235103839 — CLASS B
- 🇬🇧UKD SEADRAGON 27 m · Dredger 232059172 1020370 DREDGING OPS
- 🇬🇧UKD SEAHORSE 26 m · Dredger 232004441 9066655 LOWESTOFT
- 🇬🇧UKD SEALION 26 m · Dredger 235004829 9267314 SOUTHAMPTON
- 🇳🇴ULKEN 15 m · Port tender 257965700 — ORNERAA
- 🇬🇧ULTIMATE DREAM Port tender 235074089 — CLASS B
- 🇺🇸UMB LANDING CRAFT 7 m 338424354 — CLASS B
- 🇿🇦UMBILO 31 m · Pilot vessel 601124000 — —
- 🇱🇷UMD HERCULES 68 m · Dredger 636017869 8123195 DREDGING VARNA
- 🇿🇦UMKHOMAZI 31 m · Pilot vessel 601600400 9755270 —
- 🇩🇪UMMANZ 13 m · Law enforcement vessel 211223270 — —
- 🇺🇸UNCLE ROBERT 209 m 367725350 — XX XXX → US^0VT5
- 🇺🇸UNCLE SAM 113 m 367558150 — MAGNOLIA 113 FLEET
- 🇳🇿UNDER PRESSURE 6 m · Diving support vessel 512010657 — —
- 🇳🇴UNI OKSOY 8 m · Search and rescue vessel 258012160 — —
- 🇦🇱UNIVERSITETI DURRES 140 m · Search and rescue vessel 201777777 — CLASS B
- 🇮🇸UNNUR 17 m · Search and rescue vessel 251864040 — INFO ON VHF CH 16
- 🇳🇴UNZEN 13 m · Port tender 257921800 — TOFTOYSUND
- 🇦🇷UPSALA 24 m · Pilot vessel 701001225 — USHUAIA
- 🇸🇪URBAN 8 m · Port tender 265819260 — —
- 🇳🇴UREDD Search and rescue vessel 257078690 — —
- 🇳🇱URK 12 m · Dredger 244750890 — ALPHEN A D RIJN
- 🇵🇱URSA 60 m · Dredger 261004962 9986491 GDANSK
- 🇩🇰URSULA 13 m · Pilot vessel 219015321 — PILOT BOARDING
- 🇺🇸URSULA 207 m 367004050 — US^0SJ2 → 0F0B
- 🇩🇪URSULA DETTMANN 10 m · Search and rescue vessel 211799820 — —
- 🇺🇸US#PA311444 10 m · Search and rescue vessel 338155483 — —
- 🇺🇸US#PA4676DN Search and rescue vessel 338490293 — —
- 🇺🇸USACE NYSB-3 8 m · Dredger 368926078 — CLASS B
- 🇺🇸USACE RECONNAISSANCE 10 m · Dredger 368926696 — CLASS B
- 🇺🇸USACE VALOR 12 m · Search and rescue vessel 338925470 — —
- 🇺🇸USCG 26107 7 m · Search and rescue vessel 338926107 — —
- 🇺🇸USCG AUX 231735 3 m · Search and rescue vessel 338350684 — CLASS B
- 🇺🇸USCG AUX 8129 Search and rescue vessel 338562081 — —
- 🇺🇸USCG BRNARD WEBBER 46 m · Law enforcement vessel 338926401 — —
- 🇺🇸USCG PABLO VALENT 46 m · Law enforcement vessel 338926448 — —
- 🇺🇸USCGAUX-23273 8 m · Search and rescue vessel 338365232 — —
- 🇺🇸USCGAUX-23569 8 m · Search and rescue vessel 338056294 — —
- 🇺🇸USCGAUX-25454 8 m · Search and rescue vessel 338134972 — —
- 🇺🇸USCGC ELM 68 m · Search and rescue vessel 366951000 9155561 COLUMBIA RIVER
- 🇺🇸USCGC KING FISHER 26 m · Law enforcement vessel 366999619 — —
- 🇺🇸USCGC SLEDGE 22 m · Law enforcement vessel 366999646 — —
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