- SKIZZO Sailing 247393030 — CLASS B
- SKORPIO Fishing 247081660 — —
- SKORPION Sailing 247213410 — CLASS B
- SKORPION Passenger 247340500 9266281 ITRAN
- SKUA Sailing 247366610 — —
- SKY BLUE Sailing 247232930 — —
- SKY HUNTER II Pleasure craft 247324460 — —
- SKYFALL Pleasure craft 247229150 1008906 CALA GALERA
- SKYFALL Sailing 247392290 — CLASS B
- SKYLER Sailing 247414070 — CLASS B
- SLAM II Pleasure craft 247039850 — CLASS B
- SLANCIO II Fishing 247149150 — —
- SLOT Pleasure craft 247366080 — CLASS B
- SLOW MOTION Pleasure craft 247521060 — CLASS B
- SLOWLY FOUR Pleasure craft 247312040 — —
- SLOWLY THREE Pleasure craft 247314880 — CLASS B
- SLUK Sailing 247193120 — —
- SMALL MORE Sailing 247212060 — —
- SMALTO Pleasure craft 247363880 — CLASS B
- SMART & FURIOUS Pleasure craft 247388980 — CLASS B
- SMARTCOW Sailing 247208220 — —
- SMARTY II Pleasure craft 247324720 — —
- SMARTY IV Pleasure craft 247409400 — —
- SMILE INSIDE Sailing 247315440 — —
- SNAPPER Pleasure craft 247369460 — —
- SNAV ALCIONE Passenger 247058700 9038957 ITNAP ITPRO ITCML
- SNAV ALTAIR Passenger 247058800 8911865 GOLFO DI NAPOLI
- SNAV ANTARES Passenger 247058900 8911853 NAPOLI PONTINE E VIC
- SNAV AQUILA Passenger 247362200 9059171 NAPOLI CAPRI E VV
- SNAV ARIES Passenger 247058600 8807492 PRO NAP ISH E VIC
- SNAV ORION Passenger 247128500 9305928 ITNAP/ITPRJ VIC
- SNAV POLARIS High-speed craft 247417700 1091214 ITMSN
- SNAV RIGEL High-speed craft 247132200 9276420 ITPNZ
- SNAV SIRIUS High-speed craft 247446200 1040887 ITPRJ
- SNAV VIRGO High-speed craft 247388000 9166182 ITPRJ
- SNIPE Tug 247256900 8111740 TO BE CONFIRMED
- SNOW Sailing 247527390 — CLASS B
- SNOW WHITE Pleasure craft 247412670 — —
- SO BEAUTIFUL Pleasure craft 247037280 — —
- SO WHAT Pleasure craft 247324350 — CLASS B
- SOAMA Pleasure craft 247380560 — CLASS B
- SOFA Sailing 247323120 — —
- SOFFIO Sailing 247527350 — CLASS B
- SOFIA Sailing 247039650 — CLASS B
- SOFIA Pleasure craft 247315050 — CLASS B
- SOFIA Sailing 247384480 — —
- SOFIA Sailing 247432970 — CLASS B
- SOFIA EVELINA Sailing 247036930 — CLASS B
- SOFIA FABIO Fishing 247306530 — —
- SOFIA II Sailing 247366980 — CLASS B
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