- UNCORKED Pleasure craft 368220050 — —
- UNCORKED II Pleasure craft 368479520 — CLASS B
- UNCORKED2 Other 338495008 — —
- UND'NYE ABLE Pleasure craft 338553244 — CLASS B
- UNDAUNTED Tug 366578000 8963210 SAULT STE MARIE
- UNDAUNTED Other 366780000 8963210 — —
- UNDAUNTED Pleasure craft 367585770 — —
- UNDAUNTED Pleasure craft 368015520 — CLASS B
- UNDECIDED Pleasure craft 338060235 — —
- UNDER TAKER Pleasure craft 338394282 — CLASS B
- UNDERCOVER Pleasure craft 338108778 — —
- UNDERDOG Pleasure craft 338506818 — CLASS B
- UNDERDOG Pleasure craft 338513721 — —
- UNDERDOG Pleasure craft 367788940 — —
- UNDERFOOT Pleasure craft 368457380 — —
- UNDERHOOKS Pleasure craft 338486157 — —
- UNDERWOOD Pleasure craft 338549932 — CLASS B
- UNDINE Sailing 338368411 — —
- UNDINE Sailing 368063860 — —
- UNDRA Pleasure craft 368478440 — —
- UNFETTERED Sailing 338564024 — CLASS B
- UNFORGETABELL Pleasure craft 338104582 — CLASS B
- UNFORGETTABLE Pleasure craft 338236745 — —
- UNFORGETTABLE Pleasure craft 368069220 — CLASS B
- UNFORGETTABLE Sailing 368233840 — —
- UNFORGIVEN Sailing 368341470 — CLASS B
- UNHARNESS Pleasure craft 338176247 — —
- UNHINGED Other 338388562 — —
- UNHINGED Pleasure craft 338477545 — —
- UNIMAK Fishing 338526000 8101680 SEATTLE, WA
- UNISON Sailing 368471910 — —
- UNITED 778 Pleasure craft 338023152 — CLASS B
- UNITED STATES Fishing 367198440 8132988 CLASS B
- UNITY Pleasure craft 338489035 — CLASS B
- UNITY Passenger 368081150 — NY,NY
- UNITY Pleasure craft 368255420 — —
- UNITY! Passenger 368197680 — HARBOR CRUISE
- UNKNOWN LADY Sailing 338136354 — —
- UNKNOWN SHORE Pleasure craft 368109950 — —
- UNLADEN SWALLOW 2 Sailing 368419730 1248786 SEABROOK
- UNLEADED Sailing 368295350 — CLASS B
- UNLEASHED Pleasure craft 338132271 — CLASS B
- UNLEASHED Pleasure craft 338188493 — —
- UNLEASHED Pleasure craft 338253406 — —
- UNLEASHED Pleasure craft 368097270 — —
- UNLEASHED Pleasure craft 368215170 — CLASS B
- UNMANNED SP48-0024 Other 338556958 — —
- UNMANNED TM003 Sailing 338532212 — CLASS B
- UNMANNED-SP48 Other 338526472 — —
- UNMANNED-SP48-0025 Other 338557607 — —
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