- U'BOOT Sailing 211801620 — —
- U'IKE Sailing 218050900 — —
- U4L Pleasure craft 211778130 — —
- UAL AANJ Sailing 218045040 — —
- UBATUBA Pleasure craft 211430310 — —
- UBI BENE Sailing 211147350 — —
- UBUNTU Pleasure craft 211129690 — —
- UBUNTU Pleasure craft 218056360 — —
- UCA Other 211392630 — —
- UCA XX Pleasure craft 211144030 — —
- UCRA-POMMERNKOGGE Sailing 211753900 — A
- UEBER-WINDEN Sailing 211505550 — —
- UEBER-WINDEN Sailing 211753130 — —
- UEBERHOLVERBOOT Sailing 218061470 — —
- UECKER Special purpose 211223230 — PATROL
- UEUES EILUM Sailing 211753090 — —
- UHU Other 211625900 — —
- UIJUIJUI Sailing 211430580 — —
- UIJUIJUI FLY Sailing 211615340 — CLASS B
- UITHOORN Other 211888030 — —
- ULI Other 211454810 8764315 DEHUS
- ULKI Pleasure craft 211255340 — —
- ULLA Pleasure craft 211216560 — —
- ULLI Other 211892160 — —
- ULLI II Pleasure craft 211190910 — —
- ULME Tanker 211196020 — —
- ULMO Pleasure craft 211329450 — CLASS B
- ULRIKE Other 211183310 — NLRTM0115ADOCKX0004
- ULRIKE Sailing 211530460 — —
- ULRIKE Sailing 211683060 — CLASS B
- ULTIMA Pleasure craft 211810479 — —
- ULTRA VIOLET Pleasure craft 211349800 — —
- ULTRAVIOLET 2 Sailing 211727570 — —
- ULTREIA Sailing 211408410 — —
- ULULA Sailing 211433630 — CLASS B
- ULYSSA Sailing 211366890 — —
- ULYSSES Sailing 211468410 — —
- ULYSSES Sailing 211641700 — —
- ULYSSES Sailing 211762520 — CLASS B
- UMARE Pleasure craft 218004980 — —
- UMINOKO Sailing 211663280 — —
- UMM QARN Cargo 211882930 9732333 SG SIN → CN YSA
- UMMANZ Special purpose 211223270 — —
- UMSCHLAG Cargo 211465740 — —
- UN WARSHIP F222 Military 211920000 — —
- UNA Other 211245730 — —
- UND TSCHUESS Pleasure craft 211725860 — CLASS B
- UNDA Sailing 211135440 — —
- UNDA Pleasure craft 211788760 — —
- UNDA.S Pleasure craft 211182510 — —
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