- 🇪🇸GUARDAMAR URANIA 38 m · Search and rescue vessel 225996952 9967770 ARGUIL
- 🇳🇱GUARDIAN 66 m · Law enforcement vessel 246911000 9637363 NL COASTGUARD DUTIES
- 🇺🇸GUARDIAN 30 m · Search and rescue vessel 338142431 — SAN FRANCISCO
- 🇺🇸GUARDIAN Diving support vessel 338555052 — CLASS B
- 🇳🇬GUARDIAN 1 6 m · Law enforcement vessel 657106100 9689419 NESTOIL
- 🇳🇬GUARDIAN 2 33 m · Pilot vessel 657132800 9786396 LAGOS
- 🇳🇬GUARDIAN 5 33 m · Pilot vessel 657160700 9843053 UNDERWAY
- 🇮🇸GUDMUNDUR I TUNGU 18 m · Search and rescue vessel 251862540 — ISAFJORDUR
- 🇬🇧GUIDE 16 m · Pilot vessel 235004469 — GRAVESEND
- 🇬🇧GUIDE ME KY227 10 m · Diving support vessel 232003246 — CLASS B
- 🇨🇴GUIDO I 9 m · Medical transport 730152011 — CLASS B
- 🇫🇷GUILLEMOT 2 7 m · Search and rescue vessel 227892150 — CLASS B
- 🇺🇸GULF RESPONDER 64 m · Anti-pollution vessel 366603000 9043847 LAKE CHARLES, LA
- 🇨🇦GULF SENTINEL 23 m · Anti-pollution vessel 316014850 9839765 NANAIMO
- 🇳🇱GULL 3 m · Dredger 244031306 — —
- 🇹🇷GULSEREN SULTAN 12 m · Diving support vessel 271054109 — CLASS B
- 🇹🇷GUMUSDOGA 116 Port tender 271050143 — CLASS B
- 🇳🇱GUNGNER R 54 m · Dredger 244723000 1167312 GRENAA
- 🇩🇪GUSTAV MEYER 49 m · Law enforcement vessel 211214270 6619425 EMDEN
- 🇫🇷GUSTAVE GENDRON 17 m · Search and rescue vessel 228053920 — HERBAUDIERE
- 🇵🇦GUSTAVO CASTRO 17 m 374098000 — B 2 A
- 🇺🇸GUTSY LADY 4 — 367571490 8970469 H
- 🇬🇧GV FAIRLINE SURVEYOR 24 m 232007960 8965464 SUPPORT MMO PAM
- 🇫🇷GV PAX VOBIS 20 m · Dredger 228158000 639709 BAYONNE
- 🇬🇧GV SORRENTO 20 m 235087639 — HOW3 CABLE GUARD
- 🇫🇷GV ST-ALOUR 24 m · Dredger 227397000 8229420 PROJET INELFE
- 🇺🇸GVFD FIRE BOAT 2 11 m · Search and rescue vessel 338362878 — CLASS B
- 🇺🇸GW FRAYSER 348 m 368167230 — US^0D0R → 0969
- 🇮🇪GWU I 7 m · Search and rescue vessel 250014960 — CLASS B
- 🇮🇪GWUIII Diving support vessel 250014962 — CLASS B
- 🇳🇴GYDA 14 m · Noncombatant ship 257922900 — MAALOEY
- 🇬🇧GYPSEY RACE 25 m · Dredger 232007074 — BRIDLINGTON
- 🇫🇷GYPTIS 45 m · Law enforcement vessel 228413800 4770536 MARSEILLE
- 🇳🇴GYTULF Dredger 259042120 — —
- 🇳🇱H 8 m · Search and rescue vessel 244000355 — —
- 🇺🇸H B STEWART 275 m 366988760 — USBNA → USGAN → USBNA
- 🇺🇸H R MORRIS Dredger 367421990 8993796 —
- 🇰🇷H-08 JUNG Law enforcement vessel 440017060 — —
- 🇺🇸H. E. BOWLES 348 m 368172370 — US^0DAA → 11ED
- 🇺🇸H.R.SPIES Port tender 368926068 — CHESAPEAKE CITY
- 🇺🇸H.W.ZARLING 12 m · Anti-pollution vessel 367788550 — CLASS B
- 🇳🇿H1201 65 m 512004641 — CLASS B
- 🇳🇴HAAJA 14 m · Dredger 257207700 — —
- 🇳🇴HAAREK 8 m · Search and rescue vessel 258011060 — CLASS B
- 🇫🇮HAAVI-3 18 m · Anti-pollution vessel 230940680 — VATTUNIEMI
- 🇩🇪HABICHT 13 m · Law enforcement vessel 211553850 — KIEL
- 🇮🇱HADAR II 17 m · Pilot vessel 428074453 — —
- 🇸🇪HADDOCK 10 m · Port tender 265032880 — CLASS B
- 🇧🇭HADI 50 48 m · Port tender 408890000 9845348 DUBAI
- 🇬🇧HADRIAN Pilot vessel 235000465 9222259 TYNE
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