- 🇨🇦BLUE DIAMOND 18 m 316027529 — CLASS B
- 🇧🇷BLUE FISH 6 11 m 710001420 — CLASS B
- 🇮🇩BLUE MANTA 45 m · Diving support vessel 525005374 — AMBON
- 🇬🇧BLUE MOON 11 m 235116925 — —
- 🇬🇧BLUE TOON 15 m · Pilot vessel 235090686 — CLASS B
- 🇬🇧BLUE WHALE 19 m · Port tender 235080023 — S U R V E Y
- 🇺🇸BLUE WING 214 m 367503240 — US^0SN8 → 0872
- 🇯🇵BLUELIGHT 3 16 m · Port tender 431023745 — CLASS B
- 🇲🇳BLUEWHALE 2 Diving support vessel 457636000 — CLASS B
- 🇮🇩BLUISH DOLPHIN 33 m · Dredger 525015682 — JOHOR
- 🇳🇱BLUSBOOT BALK 7 m · Search and rescue vessel 244798212 — —
- 🇳🇱BLUSBOOT HEEG 7 m · Search and rescue vessel 244058906 — CLASS B
- 🇳🇱BLUSBOOT LEMMER 7 m · Search and rescue vessel 244860483 — —
- 🇳🇱BLUSBOOT VRZW Search and rescue vessel 244060646 — CLASS B
- 🇬🇧BLYTH ENERGY 16 m · Pilot vessel 235001405 — PILOTAGE OPS
- 🇳🇱BMS NOORMAN 14 m · Search and rescue vessel 244810618 — —
- 🇫🇷BNS BRUGGE 82 m · Law enforcement vessel 228509600 — —
- 🇧🇪BNS TOURNAI 82 m · Law enforcement vessel 205176000 4769587 BEZEE
- 🇫🇷BNS TOURNAI 82 m · Law enforcement vessel 228476900 — LORIENT
- 🇳🇱BO KAAP 2 8 m · Search and rescue vessel 244681354 — CLASS B
- 🇺🇸BO MAC 9 8 m · Search and rescue vessel 367760810 — HOUSTON TX
- 🇺🇸BOAT 266 10 m · Search and rescue vessel 368042150 — —
- 🇬🇧BOAT 37 13 m · Law enforcement vessel 235899937 — SOUTH COAST
- 🇨🇦BOB ANNAND 10 m · Law enforcement vessel 316016572 — CLASS B
- 🇺🇸BOB DEERE 134 m 367505010 — US^0QWQ → 0SFA
- 🇺🇸BOB LIVINGSTON 116 m 368574000 — US^0SK6 → 0VY7
- 🇺🇸BOB NIENHUIS 26 m 368467780 — US^06KF → 04Z3
- 🇺🇸BOB STITH 347 m 367066070 — US^0CC0 → 0R6X
- 🇺🇸BOBBY BLESSEY 212 m 366799770 — MARATHON GARYVILLE
- 🇺🇸BOBBY GOLDING 208 m 367595180 — US^070R → 0QS0
- 🇺🇸BOBBY JONES 216 m 366919160 — US^0A6K → 0F0G
- 🇳🇴BOEMLAFJORD 67 m · Noncombatant ship 257088660 9855147 LANGEVAAG - BUAVAAG
- 🇺🇸BOHEMIA 138 m 367318760 9493004 XX XXX → ?? ???
- 🇲🇹BOKA ATLANTIC 115 m · Dredger 249979000 9545675 TPC II
- 🇲🇭BOKA ATLANTIS 116 m · Diving support vessel 538003646 9441221 DOUGLAS.PLTFM
- 🇲🇭BOKA DA VINCI 115 m · Diving support vessel 538003647 9441233 LINDOE
- 🇳🇱BOKA E-DREDGE 1 44 m · Dredger 244720451 — —
- 🇬🇧BOKA POLARIS 110 m · Diving support vessel 232585000 — SKJOLD
- 🇳🇴BOKA TOPAZ 106 m · Diving support vessel 257058640 9382815 ABERDEEN UK
- 🇸🇪BOKO 9 m · Diving support vessel 265761720 — —
- 🇳🇴BOLARNE 11 m 257089500 — SANDEFJORD
- 🇺🇸BOLD VENTURE 205 m 368132340 — DOCKSIDE FLEET LMR 9
- 🇪🇸BOMBERS02 8 m · Search and rescue vessel 224398750 — CLASS B
- 🇳🇱BOMMEL 25 m · Dredger 244850205 9643659 LTKLJ
- 🇳🇱BONA SPES 4 17 m · Dredger 244393997 — WOUBRUGGE
- 🇪🇸BONAIRE 20 m · Port tender 225986632 — CLASS B
- 🇧🇷BONGO 93 m 710001361 9626443 BACIA SANTOS
- 🇮🇹BONITA 56 m · Dredger 247214700 8664917 ITGOA
- 🇫🇷BONNE ANSE 18 m · Port tender 227666050 — CLASS B
- 🇧🇷BONS AMIGOS III 14 m 710444269 — CLASS B
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