- UNITY Pleasure craft 368255420 — —
- UNITY! Passenger 368197680 — HARBOR CRUISE
- UNKNOWN LADY Sailing 338136354 — —
- UNKNOWN SHORE Pleasure craft 368109950 — —
- UNLADEN SWALLOW 2 Sailing 368419730 — 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 — —
- UNMANNED-SP48-0026 Other 338575047 — CLASS B
- UNMANNED-SP48-0027 Other 338575836 — CLASS B
- UNMANNED-SP48-SN17 Other 338534177 — CLASS B
- UNNAMED MONSTER Pleasure craft 338363339 — —
- UNNEK Pleasure craft 367645630 — CLASS B
- UNO DOS Sailing 338094231 — —
- UNO MAASS Pleasure craft 338410671 — —
- UNO MAS Pleasure craft 338208857 — —
- UNO MAS Pleasure craft 366853640 — —
- UNO MAS Pleasure craft 368279240 — CLASS B
- UNO MAS Pleasure craft 368402870 — —
- UNPLUGGED Sailing 338186396 — CLASS B
- UNPLUGGED Pleasure craft 338449585 — CLASS B
- UNREEL Pleasure craft 367576950 — CLASS B
- UNREEL Pleasure craft 368292050 — CLASS B
- UNSCRIPTED Sailing 368326370 — CLASS B
- UNSCRIPTED 2 Sailing 338372335 — CLASS B
- UNSIGHTLY Other 338072628 — —
- UNSINKABLE 2 Fishing 338514166 — CLASS B
- UNSPOKEN Other 368031930 — —
- UNSUPERVISED Pleasure craft 338430945 — CLASS B
- UNTETHERED Sailing 338186566 — —
- UNTETHERED Pleasure craft 338369814 — —
- UNTETHERED Sailing 338541105 — CLASS B
- UNTETHERED Pleasure craft 338557925 — —
- UNTETHERED Pleasure craft 368418740 — —
- UNTHOUGHT KNOWN Pleasure craft 338397636 — —
- UNTIDALED [2] Pleasure craft 338078811 — CLASS B
- UNTIE Pleasure craft 368343540 — CLASS B
- UNTIED Pleasure craft 338192556 — —
- UNTIED Pleasure craft 338469802 — CLASS B
- UNTITLED Pleasure craft 338404596 — —
- UNUSUAL ATTITUDE Other 338442109 — —
- UNUSUAL LATITUDES Fishing 338453473 — —
- UNWINDER Sailing 368084190 — —
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