- TYRESIAS Pleasure craft 224999830 — CLASS B
- UBOR WIND Sailing 225991956 — —
- UCADIZ Other 224191680 — CADIZ
- UDOTEA SV Pleasure craft 224121350 — —
- UEP UEP Sailing 224247560 — CLASS B
- UKELELE Pleasure craft 225987764 — —
- ULISES Pleasure craft 224230570 — —
- ULISES Sailing 225995377 — CLASS B
- ULISES CAT Passenger 224011230 — CLASS B
- ULISES EXPRESS Passenger 225925490 — —
- ULISES.CAT.DOS Passenger 224084190 — —
- ULTREIA Sailing 224172280 — CLASS B
- ULYSES Pleasure craft 224131320 — —
- UM7 Pleasure craft 225989619 — CLASS B
- UMA Sailing 224178330 — CLASS B
- UMAMI Sailing 225996757 — CLASS B
- UMIKO Sailing 225998392 — CLASS B
- UN CUENTO Pleasure craft 224003840 — CLASS B
- UNAMA Sailing 224953630 — CLASS B
- UNANUA Sailing 225994996 — CLASS B
- UNAVAILABLE Pleasure craft 224217790 — —
- UNAVAILABLE Pleasure craft 224223740 — CLASS B
- UNDER PRESSURE Pleasure craft 225990404 — —
- UNDERWOOD Sailing 225989995 — CLASS B
- UNGRAVITY Sailing 225984484 — —
- UNICA PEPA Passenger 224281760 — —
- UNIKO Sailing 225997486 — CLASS B
- UNION Pleasure craft 225991985 — CLASS B
- UNIQO Pleasure craft 225995961 — CLASS B
- UNIVERSITAS Pleasure craft 225995046 — CLASS B
- UNWIND Sailing 225991912 — CLASS B
- UPCT 4 Cargo 224000013 — —
- UPCT-TESIS 3 Tug 224000011 1234567 —
- URANIA Pleasure craft 225995195 — CLASS B
- URDAIBAI BAT Fishing 224097640 — CLASS B
- URDANETA Pleasure craft 225999699 — —
- URKI TERCERO Sailing 224130920 — CLASS B
- UROLA Sailing 224410330 — CLASS B
- URQUIOLA MENDI Other 224278960 — CLASS B
- URSUS PRIMER Fishing 224100190 — —
- USHUAIA Sailing 224144370 — CLASS B
- USHUAIA Pleasure craft 225999852 — CLASS B
- USO ZURIA Sailing 225992858 — CLASS B
- USOPP Pleasure craft 224151220 — —
- USTED PRIMERO Sailing 224064370 — —
- USV KALUGA Special purpose 225996968 — CLASS B
- USV PONIENTE Special purpose 225998341 — SEA TRIALS
- USV SEAD 23 Military 224124570 — —
- USV VENDAVAL Special purpose 225989680 — —
- V CENTENARIO Cargo 224739000 7812012 ESHUV
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