- 🇹🇼HWANG CHANG 33 70 m · Dredger 416012014 1049601 TAIPEI PORT
- 🇹🇼HWANG CHANGA NO35 40 m · Dredger 416009318 — TWKTA
- 🇹🇼HWANG CHANGA NO36 40 m · Dredger 416009319 — —
- 🇰🇷HWANGYEONG10HO Search and rescue vessel 440083330 — —
- 🇪🇸HYDRA 8 m · Port tender 225994567 — CLASS B
- 🇬🇧HYDRA 20 m · Dredger 235116854 — GIBRALTAR DIVERS
- 🇳🇱HYDRA 21 m · Pilot vessel 244780379 — DEN HELDER
- 🇳🇱HYDRA 39 m · Diving support vessel 245990000 9034171 VOLENDAM
- 🇳🇴HYDRA 13 m · Diving support vessel 257102260 — FISHFARMS
- 🇧🇬HYDRO 3 28 m · Diving support vessel 207345300 — CLASS B
- 🇵🇱HYDROCAT TAPPER 22 m 261000338 — CLASS B
- 🇳🇱HYDROGRAAF SURVEY 7 m · Port tender 244810846 — CLASS B
- 🇵🇱HYDROGRAF 26 11 m 261011240 — CLASS B
- 🇵🇱HYDROGRAF 27 11 m 261011300 — CLASS B
- 🇺🇸HYDRONAUT Pilot vessel 338106421 — PORTLAND,ME
- 🇫🇷HYDROPHONE 7 m · Noncombatant ship 227575320 — —
- 🇸🇬HYDROPRO 1 25 m · Diving support vessel 563064150 — CLASS B
- 🇧🇷HYDROS 4 18 m · Search and rescue vessel 710000474 — CLASS B
- 🇫🇮HYLJE 64 m · Anti-pollution vessel 230353000 8006804 —
- 🇦🇺HYNE TIMBER RESCUE 8 m · Search and rescue vessel 503789300 — —
- 🇵🇾IB CONCEPCION 41 m · Dredger 755171000 — ASUNCION Y ESC
- 🇳🇱IBIS 4 50 m · Dredger 244710062 — HAMBURG
- 🇳🇱IBIS 6 46 m · Dredger 244315982 — KIEL
- 🇳🇱IBIS IX 36 m · Dredger 244850210 — LEER
- 🇳🇱IBIS V 55 m · Dredger 244740925 — CUXHAVEN
- 🇺🇸ICY BAY 9 m · Port tender 338073341 — CLASS B
- 🇳🇴IDEFIX 10 m 257036060 — CLASS B
- 🇮🇩IDN 991 124 m · Medical transport 525114099 9884394 —
- 🇮🇩IDN 992 Medical transport 525114112 9914175 TJ UBAN
- 🇺🇸IDNR 2F-725 9 m · Law enforcement vessel 368415250 — —
- 🇳🇱IDUN R 79 m · Dredger 246773000 8325250 GRENAA
- 🇮🇹IEVOLECO 27 m · Anti-pollution vessel 247156200 9248760 OTRANTO
- 🇮🇹IEVOLI SHUTTLE 46 m · Anti-pollution vessel 247357300 9564437 CIVITAVECCHIA
- 🇮🇪IFI DELTA 11 Law enforcement vessel 250005438 — CLASS B
- 🇮🇪IFI DELTA 4 Law enforcement vessel 250005304 — —
- 🇬🇷IGNATIOS V Dredger 239601409 — —
- 🇬🇷IGNATIOS XXI 44 m · Dredger 237500621 — CLASS B
- 🇳🇱IGUAZU 45 m · Dredger 244150827 9201920 MZ BEW
- 🇦🇷IGUAZU 10 m · Pilot vessel 701001114 — —
- 🇳🇱IJBURG 45 m · Dredger 244790224 — —
- 🇳🇱IJMEER 37 m · Dredger 244750888 — AMAZONEHAVEN
- 🇳🇱IJSSEL 9 m · Dredger 244377625 — —
- 🇳🇱IJSSEL 29 m · Dredger 244780696 — —
- 🇳🇱IJSSELDELTA Dredger 244700254 — RHEINBERG
- 🇳🇱IJSSELDELTA 99 m · Dredger 245709000 7737690 DEHAM
- 🇳🇱IJSSELMEER 18 m · Dredger 244057247 — WEEKEND
- 🇳🇱IJSSELSTEIN 15 m · Dredger 244728332 — EEMSHAVEN → WERKZAAM
- 🇳🇱IJZEREN HEIN 23 m · Dredger 244780590 — —
- 🇳🇿IKATERE 14 m 512001497 — —
- 🇹🇷IKIZDERE 17 m · Pilot vessel 271010691 — CLASS B
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