- 🇭🇰HKFSD SB21 7 m · Search and rescue vessel 477995889 — CLASS B
- 🇩🇪HLB BINGEN 15 m · Search and rescue vessel 211883140 — BINGEN
- 🇫🇮HM 11 17 m · Anti-pollution vessel 230999850 — —
- 🇫🇮HM-61 18 m · Search and rescue vessel 230940690 — HELSINKI
- 🇳🇿HM05 10 m · Search and rescue vessel 512003945 — —
- 🇳🇿HM1 8 m · Law enforcement vessel 512009040 — —
- 🇳🇿HM7 9 m · Law enforcement vessel 512009045 — CLASS B
- 🇳🇿HM8 9 m · Law enforcement vessel 512009046 — CLASS B
- 🇬🇮HMC SEARCHER 11 m · Law enforcement vessel 236112138 — CLASS B
- 🇬🇧HMCG HAWK 10 m · Search and rescue vessel 235008001 — —
- 🇰🇳HMS BUBBLES 17 m · Noncombatant ship 341403002 — CLASS B
- 🇰🇷HO RAN DO HO Pilot vessel 440155330 — —
- 🇩🇪HOBEN 26 m · Law enforcement vessel 211369510 — ON PATROL BALTIC SEA
- 🇺🇸HOCKLEY 115 m 368124040 — US^07ZL → ?? ???
- 🇳🇱HOFSKIP 12 m 244039477 — CLASS B
- 🇯🇵HOKUTO 12 m 431009269 — CLASS B
- 🇯🇵HOKUTO 18 m · Pilot vessel 431027056 — CLASS B
- 🇩🇪HOL DEEP Dredger 211116250 — SPUELARBEITEN
- 🇲🇽HOLBOX 14 m · Pilot vessel 345001235 — COZUMEL
- 🇸🇪HOLGER 12 m · Port tender 265084820 — CLASS B
- 🇺🇸HOLIDAY 24 m 367370820 — CLASS B
- 🇳🇱HOLLAND 1 Dredger 244150610 — —
- 🇳🇱HOLLAND DIVING 1 29 m · Dredger 244780602 — VLAARDINGEN
- 🇳🇱HOLLAND DIVING 2 11 m · Diving support vessel 244070230 — —
- 🇳🇴HOLMTUN 15 m · Diving support vessel 257771600 — CLASS B
- 🇳🇴HOLTEN 11 m · Dredger 258030150 — CLASS B
- 🇺🇸HOLY CROSS 103 m 367389540 — US^0SL2 → 0ZM2
- 🇺🇸HOLY ROSARY 85 m 367389530 — US^0EYK → 0ZDS
- 🇺🇸HONDO 257 m 367728240 — US^11PH → 0ZWT
- 🇺🇸HONEY BADGER 11 m · Dredger 368127870 — HOME PORT
- 🇦🇺HONEYCOMBES RESCUE Search and rescue vessel 503185480 — —
- 🇬🇧HONEYDEW 24 m · Diving support vessel 235052721 — CLASS B
- 🇸🇱HONG HAI 9 160 m · Dredger 667001262 8572126 MELAKA
- 🇵🇭HONG XIANG668 90 m · Dredger 548422900 1016927 MARIVELES BATAAN
- 🇨🇳HONG YUE 1008 74 m · Dredger 413388520 — GUANGZHOU AND ZHUHAI
- 🇺🇸HONOLULU 13 m · Pilot vessel 338070127 — —
- 🇧🇪HONTE 20 m · Pilot vessel 205651000 9680138 VLISSINGEN REDE
- 🇦🇷HONU 17 m · Pilot vessel 701001153 — DAVINSON
- 🇩🇪HOOGE 6 m · Law enforcement vessel 211593870 — —
- 🇩🇪HOOGE 22 m · Anti-pollution vessel 211796430 — WATTENFAHRT
- 🇦🇺HOPE 7 m · Law enforcement vessel 503143090 — —
- 🇺🇸HOPMAN 8 m · Dredger 368926289 — CLASS B
- 🇬🇧HOPPER G63 — 235059549 — CLASS B
- 🇬🇧HORATIO 15 m · Pilot vessel 232019673 — CLASS B
- 🇳🇱HORDE 527 m · Dredger 244780592 — —
- 🇬🇧HORIZON PROSPECTOR 85 m · Dredger 232064538 9770189 LEITH
- 🇳🇴HORNOYA 13 m · Port tender 257212600 — —
- 🇬🇧HORNSEA RESCUE 8 m · Search and rescue vessel 232017943 — CLASS B
- 🇩🇪HORST FELIX 96 m · Dredger 211524860 — WIEN
- 🇩🇪HORST HEINER KNETEN 10 m · Search and rescue vessel 211141910 — SAR IN OPERATION
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