- 🇺🇸MASS STATE POLICE 30 11 m · Law enforcement vessel 338203116 — —
- 🇺🇸MASS_STATE_POLICE_40 14 m · Law enforcement vessel 338023196 — —
- 🇺🇸MASS_STATE_POLICE_43 14 m · Law enforcement vessel 338023823 — —
- 🇺🇸MASSPORT MARINE 32 14 m · Search and rescue vessel 338526711 — —
- 🇸🇬MASTER SEA 17 m · Pilot vessel 563077940 — CLASS B
- 🇲🇳MASTERTECH 1 Diving support vessel 457380000 — CLASS B
- 🇲🇳MASTERTECH2 18 m · Diving support vessel 457874000 — CLASS B
- 🇫🇷MATELOT LOUIS COLET 19 m · Search and rescue vessel 227890140 — —
- 🇫🇷MATELOT PIERI 12 m · Search and rescue vessel 227967230 — CLASS B
- 🇨🇾MATEUS OLIVEIRA 76 m · Dredger 212212000 8120583 PT FDF
- 🇩🇪MATHIAS 8 m · Search and rescue vessel 211759370 — CLASS B
- 🇦🇺MATILDA MAE 15 m · Diving support vessel 503498710 — CLASS B
- 🇵🇱MATPOL 2 Diving support vessel 261006036 — CLASS B
- 🇯🇵MATSUSHIMA 93 m · Search and rescue vessel 431005644 9755426 JP SGM
- 🇺🇸MATTHEW 82 m 367688580 — OLDRIVER
- 🇺🇸MATTHEW JAMES 115 m 367145380 — US^0QFX → 0Z9D
- 🇳🇱MAUD (PILOTS) 23 m · Pilot vessel 246936000 — PILOT BOARDING AREA
- 🇬🇧MAVERICK Dredger 235055355 — CLASS B
- 🇬🇧MAVERICK 11 m · Diving support vessel 235094233 — CLASS B
- 🇺🇸MAVERICK 116 m 367589520 — US^0SN8 → 045F
- 🇳🇱MAX 27 m 246910000 9652404 BRUNSBUTTEL
- 🇺🇸MAX A FLETCHER 227 m 368273170 — US^0EEQ → 0DED
- 🇦🇷MAX DREAM 11 m · Pilot vessel 701001307 — SAN LORENZO
- 🇩🇪MAXAU 39 m · Dredger 211523600 — KARLSRUHE
- 🇵🇹MAXI TOPO 8 m · Port tender 263443009 — CLASS B
- 🇳🇴MAXIMUS 14 m · Diving support vessel 257069840 — CLASS B
- 🇳🇴MAXOYE 15 m · Diving support vessel 257699900 — —
- 🇪🇸MAYADI DOS 7 m · Anti-pollution vessel 225988037 — CLASS B
- 🇪🇸MAYADI UNO 6 m · Anti-pollution vessel 225988031 — —
- 🇮🇪MAYO CIVIL DEFENCE 1 7 m · Search and rescue vessel 250005689 — CLASS B
- 🇩🇪MB EISVOGEL 8 m · Anti-pollution vessel 211668780 — —
- 🇬🇧MBA SEPIA 16 m · Noncombatant ship 235017255 — —
- 🇹🇷MBB ABANOZ Anti-pollution vessel 271046363 — CLASS B
- 🇹🇷MBB GOZNE Law enforcement vessel 271046365 — CLASS B
- 🇺🇸MBI 007 55 m · Dredger 368397550 — CLASS B
- 🇺🇸MBI 009 55 m · Dredger 368397570 — CLASS B
- 🇺🇸MBI 010 48 m · Dredger 368420270 — CLASS B
- 🇺🇸MBI 011 54 m · Dredger 368397580 — CLASS B
- 🇺🇸MCCULLOCH 116 m 368078510 — US^0QR7 → 0SXH
- 🇺🇸MCFARLAND 100 m · Dredger 338997000 7739856 MIFFLIN RANGE
- 🇨🇦MCINTYRE BAY 19 m · Search and rescue vessel 316038296 — OPS
- 🇺🇸MCKENZIE 30 m · Dredger 366973860 8958148 CLASS B
- 🇺🇸MCR 8 77 m · Dredger 368328430 — —
- 🇺🇸MDFR COMMAND 12 m · Search and rescue vessel 338374592 — —
- 🇺🇸MDFR FIRE BOAT 3 16 m · Search and rescue vessel 338464543 — —
- 🇦🇺MDT L2 11 m · Port tender 503703600 — —
- 🇺🇸MEAGAN A 18 m 368413350 1306487 EVANSVILLE
- 🇳🇱MEANDER WATERHULPDST 10 m · Search and rescue vessel 244690006 — PATROLSTANDBYVHF10
- 🇩🇪MECKELBORG 15 m · Pilot vessel 211222750 8684632 BREMERHAVEN
- 🇵🇦MED SURVEYOR 47 m · Search and rescue vessel 352572000 7629946 GRLAV
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