- SIGNET MAGIC Tug 367577390 9706853 BROWNSVILLE,TEXSAS
- SIGNET POLARIS Tug 367589350 9681778 US^0QK4 → 0T0B
- SIGNET RANGER Tug 367311830 1152107 BROWNSVILLE,TEXAS
- SIGNET SIRIUS Tug 368303710 9998444 US^0XKD → 074Z
- SIGNET STARS&STRIPES Tug 367507390 9593141 INGLESIDE TX
- SIGNET TITAN Tug 366193000 9183958 XX XXX → US^0S3B
- SIGNET VOLUNTEER Special purpose 368139720 1001301448 US^0YHM → 10F2
- SIGNET WARHORSE I Tug 369599000 9254018 XX XXX → US^0SGE
- SIGNET WARHORSE II Tug 366885000 9388132 US^0YHM
- SIGNET WARHORSE III Tug 368105000 8967577 XX XXX → US^0S3B
- SIGNET WEATHERLY Tug 367511340 9581124 PASCAGOULA, MS
- SIGNET-THUNDER Tug 369579000 9253571 SJPR
- SIGNORINA Sailing 338458003 — —
- SIGNS OF LIFE Pleasure craft 338478264 — CLASS B
- SIGNS TO LIBERTY Passenger 368116140 — NYC,NY
- SIGRID DUNLAP Tug 368031220 9855068 EVERETT,WA
- SIKU Tug 366888910 9107837 SEWARD
- SIKULIAQ Other 303364000 9578945 NOME AK
- SIKUMI Passenger 338196886 — CLASS B
- SILENCE Sailing 367186560 — —
- SILENCE RISING Pleasure craft 367607650 — —
- SILENT H Sailing 338232097 — —
- SILENT JEWEL Pleasure craft 338444508 — —
- SILENT RUNNER IV Pleasure craft 367794140 — CLASS B
- SILENT SEAS Sailing 368312570 — CLASS B
- SILENT TS Pleasure craft 367500190 — CLASS B
- SILENT WITNESS Pleasure craft 338504881 — —
- SILHOUETTE Pleasure craft 338072195 — —
- SILHOUETTE Pleasure craft 338324449 — —
- SILHOUETTE Pleasure craft 367013510 — —
- SILHOUETTE Sailing 367090940 — CLASS B
- SILHOULETT Pleasure craft 368212120 — CLASS B
- SILIQUE Sailing 368479560 — CLASS B
- SILK Pleasure craft 367483610 — —
- SILK ROAD Pleasure craft 367377830 — —
- SILKE Sailing 338359298 — —
- SILKY DAY Pleasure craft 338335096 — KENOSHA
- SILLY BOY Sailing 338185302 — CLASS B
- SILLY GOOSE Pleasure craft 367588820 — CLASS B
- SILVER ALERT Pleasure craft 368438760 — —
- SILVER BEAVER Fishing 338143312 — —
- SILVER BULLET Pleasure craft 338386704 — —
- SILVER BULLET Passenger 366945510 — —
- SILVER CHARM Pleasure craft 338001036 — —
- SILVER CHARM Sailing 368278010 — —
- SILVER CHEEKS Pleasure craft 368424840 — CLASS B
- SILVER DIAMOND Tug 368424790 — HORN ISLAND PASS
- SILVER DRAGON Sailing 338355544 — —
- SILVER EXPRESS Passenger 368100440 — CLASS B
- SILVER FLIGHT Pleasure craft 338097053 — CLASS B
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