- 🇬🇧MANASOTA 12 m 232061043 — CLASS B
- 🇲🇽MANATEE 14 m · Pilot vessel 345001236 — CLASS B
- 🇺🇸MANATEE 17 m · Pilot vessel 367689620 — —
- 🇳🇴MANDALORIAN 13 m · Port tender 257045400 7607053 CLASS B
- 🇺🇸MANNIE 176 m 367410990 — US PGL → US LCH
- 🇬🇧MANNIN 33 m · Dredger 235006167 — CLASS B
- 🇦🇺MANNS POINT 16 m · Port tender 503633300 — —
- 🇬🇧MANOR BRUNEL 20 m 232004634 — HARWICH
- 🇩🇪MANOUK 19 m · Port tender 211740400 — —
- 🇳🇱MANTA 84 m · Dredger 245397000 8928301 STAY CLEAR 500M
- 🇮🇹MANTA 20 m · Anti-pollution vessel 247348900 — NRECALADA
- 🇵🇱MANTA 11 m · Port tender 261186612 — —
- 🇸🇮MANTA BIANCA 81-IZ 12 m · Diving support vessel 278614000 — —
- 🇵🇦MANTA II 16 m · Pilot vessel 356321000 — PANAMA CANAL
- 🇦🇺MANTA RAY 1 35 m · Port tender 503195560 — CLASS B
- 🇦🇺MANTIS 6 m · Law enforcement vessel 503186010 — CLASS B
- 🇨🇾MANU PEKKA 48 m · Dredger 212701000 — DUNDEE
- 🇲🇹MANUCCA 14 m · Search and rescue vessel 256002795 — CLASS B
- 🇳🇱MANUEL II 15 m · Port tender 244013251 — EEMSHAVEN
- 🇫🇷MAORE 10 m · Diving support vessel 227654960 — CLASS B
- 🇸🇪MAPAS SEAWORK.SE 11 m · Diving support vessel 265804160 — —
- 🇪🇸MAR DE VALENCIA 4 7 m · Diving support vessel 225995535 — CLASS B
- 🇪🇸MAR DE VALENCIA III 7 m · Diving support vessel 224729180 — —
- 🇦🇷MAR DULCE 22 m · Pilot vessel 701007046 — PTO LA PLATA
- 🇧🇷MAR LIMPO II 62 m · Anti-pollution vessel 710007570 9618757 PMAC
- 🇧🇷MAR LIMPO V 61 m · Anti-pollution vessel 710010940 9641261 RIO DE JANEIRO
- 🇧🇷MAR LIMPO VII 62 m · Anti-pollution vessel 710010960 9648154 P56
- 🇺🇸MARA BROOKS 270 m 368399830 — US^08BH → 0E9A
- 🇳🇿MARAETAI COASTGUARD 9 m · Search and rescue vessel 512000144 — CLASS B
- 🇺🇸MARATHON 361 m 367472940 — US^0NBT → 08TY
- 🇦🇪MARAWAH Dredger 470813000 — LULU ISLAND
- 🇺🇸MARCI GALE 117 m 368063940 — US^08BK → 0747
- 🇺🇸MARCI GALE 284 m 368173140 — US^0AUR → 0W24
- 🇳🇱MARE (PILOTS) 23 m · Pilot vessel 244618000 — LAUWERSOOG
- 🇵🇦MARE 1 7 m · Port tender 352004296 — —
- 🇵🇦MARE 2 7 m · Port tender 352004306 — CENTRAL MED
- 🇧🇷MARE NOSTRUM 25 m · Diving support vessel 710006296 — —
- 🇪🇸MARESA DOS 25 m · Port tender 224113130 9317602 CLASS B
- 🇺🇸MARGARET ANN 214 m 367643350 — US^0D48 → 0AJL
- 🇺🇸MARGARET ANNE 116 m 367772590 — US^0ZME → 0S8P
- 🇩🇰MARGRETHE GAARDBO 24 m · Search and rescue vessel 219002774 8917431 HIRSTHALS
- 🇺🇸MARGUERITE MILLER 9 m · Search and rescue vessel 367627750 — —
- 🇫🇮MARIA 13 m · Law enforcement vessel 230943370 — CLASS B
- 🇯🇲MARIA 50 m 339306000 1005150 FLISVOS
- 🇧🇷MARIA 19 m 710466742 — CLASS B
- 🇩🇪MARIA ANNA 7 m · Law enforcement vessel 211190680 — WEDEL
- 🇪🇸MARIA PITA 40 m · Search and rescue vessel 224860000 9429118 GIJON
- 🇲🇹MARIA VITTORIA Z 80 m · Dredger 248141000 9794800 GENOVA-BREAKWATERS
- 🇪🇸MARIA ZAMBRANO 40 m · Search and rescue vessel 224703000 9429106 ESTRG
- 🇬🇧MARIANA K 15 m · Diving support vessel 235031085 — CLASS B
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