- 🇰🇳SUNLIGHT ATHENA 12 m · Noncombatant ship 341640001 — CLASS B
- 🇸🇬SUNLIGHT AURORA 23 m · Noncombatant ship 563076280 — CLASS B
- 🇰🇳SUNLIGHT EROS 16 m · Noncombatant ship 341612001 — CLASS B
- 🇰🇳SUNLIGHT HELIOS 16 m · Noncombatant ship 341549001 — CLASS B
- 🇰🇳SUNLIGHT HERMES 17 m · Noncombatant ship 341587001 — CLASS B
- 🇸🇬SUNLIGHT LUNA 23 m · Noncombatant ship 563076270 — CLASS B
- 🇰🇳SUNSHINE 15 m · Noncombatant ship 341614001 — CLASS B
- 🇬🇧SUPERFAST 8 FRC 6 m · Search and rescue vessel 232049221 — CLASS B
- 🇮🇹SUPERGABBIANO DUE 13 m · Anti-pollution vessel 247443500 — —
- 🇮🇹SUPERGABBIANO SETTE 22 m · Anti-pollution vessel 247176900 — SIRACUSA
- 🇸🇬SUPERLITE 8 17 m · Diving support vessel 563034610 — CLASS B
- 🇿🇦SUPERLITE II Port tender 601024650 — CLASS B
- 🇿🇦SUPREME 11 m · Port tender 601040400 — CLASS B
- 🇫🇷SURESNES 30 m · Dredger 226019060 — —
- 🇦🇺SURF-RESCUE30 Search and rescue vessel 503151110 — CLASS B
- 🇫🇷SURFIN BIRD 8 m · Diving support vessel 227021680 — —
- 🇷🇪SURVEX 1 9 m · Dredger 660005530 — CLASS B
- 🇫🇷SURVEX 6 9 m · Noncombatant ship 227474810 — CLASS B
- 🇺🇸SURVEY 1 — 338346212 — CLASS B
- 🇫🇮SURVEY 5 10 m · Dredger 230129310 — VAASA
- 🇬🇧SURVEY VESSEL 2 18 m · Dredger 232067108 — —
- 🇺🇸SURVEY VESSEL BLAKE 25 m · Dredger 367642270 — SHIP SHOAL
- 🇺🇸SURVEY VESSEL BUCK 8 m · Port tender 368926646 — —
- 🇺🇸SURVEY VESSEL GRAHAM 9 m · Dredger 366999010 — CLASS B
- 🇳🇱SURVEYA 7 m · Dredger 244965885 — CLASS B
- 🇳🇱SURVEYOR 1 19 m · Port tender 244010723 — —
- 🇳🇱SURVEYOR 2 19 m · Port tender 244010724 — MAASVLAKTE
- 🇺🇸SURVEYOR2 16 m · Dredger 338468825 — —
- 🇺🇸SUSAN DUFRIEND 93 m 366970770 — NOSY SHIPYARD M.111
- 🇺🇸SUSAN J GUNDLACH 114 m 367542760 — TEXAS CITY TX
- 🇺🇸SUSAN JOHNSON 361 m 367031720 — USDVT → USBTR
- 🇺🇸SUSAN K 354 m 367420440 — US^0D0D → 0D9J
- 🇺🇸SUSAN L STALL 411 m 367456960 — USAMD → USK2S
- 🇺🇸SUSQUEHANNA 16 m · Pilot vessel 368172490 — —
- 🇫🇮SUURSAARI 45 m · Dredger 230061040 4544028 FIN HELSINKI
- 🇳🇱SUZANNE 29 m · Dredger 244710399 — CLASS B
- 🇯🇵SUZUKA 89 m · Search and rescue vessel 432741000 9589906 JP → NGO N2
- 🇺🇸SV HEISELMAN 9 m 368296016 — CLASS B
- 🇭🇷SV.ANDRIJA 8 m · Pilot vessel 238929740 — —
- 🇭🇷SV.BARBARA 6 m · Pilot vessel 238624410 — —
- 🇭🇷SV.KATARINA 7 m · Pilot vessel 238609510 — —
- 🇫🇮SVAERTAN Anti-pollution vessel 230992750 — MARIEHAMN
- 🇳🇴SVALO 9 m · Port tender 257119870 — CLASS B
- 🇸🇪SVANEN (0706299224) 11 m · Diving support vessel 265736990 — CLASS B
- 🇫🇮SVANTE G 17 m · Search and rescue vessel 230046580 — MARIEHAMN AREA
- 🇸🇪SVARDET 10 m · Search and rescue vessel 265660200 — —
- 🇳🇴SVEIN 1 8 m · Search and rescue vessel 257063300 — CLASS B
- 🇮🇸SVEINBJORN SVEINSSON 17 m · Search and rescue vessel 251863940 — ISVPN
- 🇦🇺SVITZER HERON 30 m · Port tender 503784000 9578581 ADELAIDE
- 🇬🇧SVITZER LEVEN 20 m · Port tender 235103029 — CLASS B
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