- SONJA Pleasure craft 230980180 — CLASS B
- SONJA3 Pleasure craft 230016670 — —
- SONJUSKA Sailing 230149700 — —
- SONNSKAR Fishing 230983690 8404771 KSK
- SOPHIA Sailing 230179300 — —
- SOPHIE Sailing 230096140 — —
- SOTKA Special purpose 230992570 — —
- SOTTO VOCE Sailing 230191280 — —
- SOULMATE Sailing 230168130 — —
- SOUND OF SILENCE Pleasure craft 230094470 — —
- SOUTH OF HEAVEN Pleasure craft 230936960 — —
- SPARK Special purpose 230983050 — HANKO
- SPARKLE Pleasure craft 230184100 — —
- SPECULATOR Pleasure craft 230016540 — —
- SPEEDFIRE Sailing 230995310 — —
- SPICA3 Sailing 230144090 — —
- SPUMARE Sailing 230064360 — —
- SQUID Pleasure craft 230172930 — —
- SS LOKKI Passenger 230086910 — TURKU
- STAR OF SAIMAA Pleasure craft 230044970 — —
- STEEL Cargo 230202000 8503503 FIRAA
- STELLA Pleasure craft 230149940 — —
- STELLA Sailing 230168110 — —
- STELLA Pleasure craft 230186070 — CLASS B
- STELLA Passenger 230634000 9624691 GALTBY-KITTUIS
- STELLA POLARIS Special purpose 230092050 — —
- STELLA POLARIS Pleasure craft 230174230 — —
- STEPHANIE Pleasure craft 230059550 — —
- STERNA Sailing 230194800 — CLASS B
- STERNA Passenger 230987380 8685753 KANNVIK-HEPONIEMI
- STIMMY Sailing 230165100 — —
- STOR-KLAS Special purpose 230136350 — CLASS B
- STORM PETREL Sailing 230110270 — —
- STORMPIPPI Sailing 230135250 — CLASS B
- STORMRIDER Pleasure craft 230132410 — CLASS B
- STORMUR Pleasure craft 230093190 — —
- STOROREN Pleasure craft 230110580 — —
- SUBSEA SURVEYOR High-speed craft 230072700 — LAPPO
- SUBSEA TENDER Other 230155020 — SVINO
- SUBSEA V Special purpose 230999110 — —
- SUBSEA VI Tug 230980160 — MARIEHAMN
- SUBSEA VIII Cargo 230046600 — KUMLINGE
- SUGANYU 03808 10 Other 230380810 — CLASS B
- SUGANYU02036 1 81 Other 230203601 — CLASS B
- SUGANYU02870 28 51 Other 230740928 — —
- SUGANYU04036 3179 Other 230703631 — CLASS B
- SUGANYU04439 36 93 Other 230843936 — CLASS B
- SUGANYU04478 7 Other 230747807 — CLASS B
- SUGANYU04481 36 86 Other 230748136 — CLASS B
- SUGANYU04481 4 59 Other 230748104 — CLASS B
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