- 🇧🇷MARLIN YARE 67 m · Anti-pollution vessel 710003750 9255098 BACIADECAMPOS
- 🇳🇴MAROEYSUND 15 m · Dredger 259047380 — —
- 🇪🇸MARPOL SPRA 30 m · Anti-pollution vessel 225948340 — BARCELONA
- 🇬🇧MARQUESS Port tender 232037659 — —
- 🇺🇸MARQUETTE HILLTOPPER 349 m 367505750 — US^08DE → 0736
- 🇺🇸MARQUETTE LEGENDS 363 m 367505630 — US^0CZT → 0RM1
- 🇺🇸MARQUETTE MARINER 362 m 367451290 — USSTL → USMSY
- 🇺🇸MARQUETTE VETERAN 361 m 367637960 — US^0EAF → 0R6X
- 🇺🇸MARQUETTE WARRIOR 356 m 367638070 — US^0W2F → 11CY
- 🇲🇭MARSOL SHINY 60 m 538011459 9463827 UMM SHAIF
- 🇳🇱MART 23 m · Dredger 244724917 — BREMEN WESER TRAFFIC
- 🇳🇴MARTA A 8 m · Port tender 257493040 — CLASS B
- 🇪🇸MARTA MATA 39 m · Search and rescue vessel 224634000 9429120 SAR
- 🇺🇸MARTHA DENTON 278 m 366962980 — USPAH → USBNA → USPAH
- 🇺🇸MARTHA INGRAM 489 m 366951240 — USUQM → USRSF → USUQM
- 🇩🇰MARTHA LERCHE 19 m · Search and rescue vessel 219000775 8717441 —
- 🇺🇸MARTHA LYNN 483 m 367533020 8836637 US^0CZD → 0D9Q
- 🇺🇸MARTHA OLIVER 112 m 366933730 — US^0YUE → 0VXR
- 🇺🇸MARTHA T 91 m 367156850 — USHOU → USPCR → USHOU
- 🇺🇸MARTIN 92 m 368085190 — XX XXX → US^0SN8
- 🇺🇸MARTIN CHALLENGER 115 m 366874920 8644436 MES 193
- 🇺🇸MARTIN EXPLORER 140 m 366884140 9160853 KMI PERTH AMBOY
- 🇺🇸MARTIN EXPRESS 91 m 366884150 — SW/SY CHANNELVIEW
- 🇺🇸MARTIN PIERCE 22 m · Search and rescue vessel 368483220 — —
- 🇺🇸MARTINSVILLE 310 m 367598960 — US^084J → 07B1
- 🇺🇸MARTY BASKERVILLE 369 m 367092230 — US UQM → USMSY
- 🇲🇹MARWA 11 m · Pilot vessel 256004945 — CLASS B
- 🇳🇱MARY 1 26 m · Dredger 244137690 — TIELD.
- 🇳🇱MARY 1 26 m · Dredger 245419000 — TIELD
- 🇺🇸MARY ANN MORAN 188 m 367453420 9560534 KENNER,LA
- 🇺🇸MARY E. GATTLE 225 m 368034540 — GRAND RIVERS KY 23TN
- 🇺🇸MARY ELLEN JONES 50 m 367320890 8836558 US^11SS → 08V0
- 🇺🇸MARY ENA DEVALL 201 m 367798550 — HOUSTON
- 🇺🇸MARY EVELYN 352 m 366984940 — US^11S9 → 0X28
- 🇺🇸MARY K CAVARRA 357 m 366967650 — US^0WHY → 0AJ7
- 🇺🇸MARY KAY 81 m 366997840 8635801 XX XXX → US^0AF0
- 🇺🇸MARY KAY ECKSTEIN 109 m 367638080 — US^0EYJ → 11CY
- 🇺🇸MARY LYNN COOPER 22 m 368157130 — NEW ORLEANS,LA
- 🇬🇧MARY OLWEN 6 m 235028724 — CLASS B
- 🇺🇸MARY PARKER 349 m 366991790 8836431 US^0FQL → 0X6C
- 🇺🇸MARY PATRICIA 18 m 368225790 — —
- 🇺🇸MARY ROBERTS 120 m 367583480 — TX CITY
- 🇺🇸MASH 11 m · Pilot vessel 338011673 — —
- 🇬🇱MASIK MASTER 32 m 331613000 7116858 NAAJAAT
- 🇬🇱MASIK VIKING 25 m · Pilot vessel 331000392 — NUUK
- 🇳🇴MASKULIN 14 m · Pilot vessel 257086980 — FONNES PILOT
- 🇪🇸MASPALOMAS 23 m · Port tender 224060250 — CLASS B
- 🇺🇸MASS STATE POLICE 10 10 m · Law enforcement vessel 338023819 — —
- 🇺🇸MASS STATE POLICE 10 10 m · Law enforcement vessel 338023821 — —
- 🇺🇸MASS STATE POLICE 30 11 m · Law enforcement vessel 338203116 — —
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