- ISLANDER Passenger 367560440 8994207 NEWPORT-BI FERRY
- ISLANDER Pleasure craft 368167040 — —
- ISLANDER Fishing 368406170 — —
- ISLANDER Other 368468210 — —
- ISLANDER EXPRESSS High-speed craft 366943970 8967876 DANA POINT
- ISLANDER II Passenger 367071720 — —
- ISLANDHOME Passenger 367130910 9410478 VINEYARD ROUTE
- ISLANDIA II Pleasure craft 338175175 — CLASS B
- ISLAS Pleasure craft 338168135 — CLASS B
- ISLASUE Sailing 338196442 — CLASS B
- ISLAY Sailing 338484229 — —
- ISLE DERNIERE Fishing 367108790 7902087 —
- ISLE DOMINATOR Fishing 367589770 — —
- ISLE HOPE'N Pleasure craft 368280150 — —
- ISLE OF FIRE Other 368094230 — —
- ISLE OF GRACE Pleasure craft 338333199 — CLASS B
- ISLE OF MISFITS Sailing 368313860 — CLASS B
- ISLE OF SKYE Sailing 338147555 — —
- ISLE ROYAL QUEEN IV Passenger 367046160 — ISRO/COPPER
- ISOBAR Pleasure craft 368270190 — —
- ISOBEL Sailing 368305010 — —
- ISOBEL III Pleasure craft 368232190 — —
- ISOLA Pleasure craft 338134938 — CLASS B
- ISOLA Pleasure craft 338551891 — —
- ISOLA Pleasure craft 338561201 — —
- ISOLA Pleasure craft 367104760 — —
- ISOLA Pleasure craft 367573720 — CLASS B
- ISOLDE Sailing 338460822 — —
- ISOPHIA Pleasure craft 338552556 — —
- ISOSCELES Pleasure craft 338143464 — —
- ISRIUS Pleasure craft 367520760 — —
- ISSIMO Pleasure craft 368313770 — —
- ISSWAT Fishing 368487860 — —
- ISTHMUS BREEZE Sailing 368212050 — —
- IT HAPPENS Pleasure craft 338491025 — CLASS B
- IT IS WELL Pleasure craft 367773710 — —
- IT PAYS Pleasure craft 338170482 — —
- IT WASN'T ME Sailing 338452077 — —
- IT'S A YOT Pleasure craft 338488422 — —
- IT'S ABOAT TIME Pleasure craft 338311581 — CLASS B
- IT'S ABOUT TIME Other 338423414 — —
- IT'S ABOW'T TIME Pleasure craft 338328935 — CLASS B
- IT'S ALL GOOD Pleasure craft 338327991 — —
- IT'S ALL GOOD Pleasure craft 368167990 — CLASS B
- IT'S ALWAYS FIVE O Pleasure craft 338509363 — —
- IT'S ANOTHER BILL Pleasure craft 338446597 — —
- IT'S ENOUGH Pleasure craft 338697000 — CLASS B
- IT'S FOR YOU II Pleasure craft 368464550 — —
- IT'S KNOT EASY Pleasure craft 338479848 — —
- IT'S THE WATER Pleasure craft 338540837 — —
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