- MASUTOMIMARU Tanker 431026421 — CLASS B
- MASUYOSHIMARU Fishing 431018139 — CLASS B
- MATABE YOSHIEIMARU Fishing 431023964 — CLASS B
- MATAEMARU Tug 431025945 — CLASS B
- MATAEMON MARU NO.4 Tug 431020899 — CLASS B
- MATSU MARU NO,12 Tanker 431015764 9894600 JP SIG SANWA C OFF
- MATSU MARU NO,21 Tanker 431008453 9789099 JP KIJ E
- MATSUBARA Tug 431013915 — JP NSR
- MATSUBISHI MARU Tanker 431014199 9873450 JP ONX OFF
- MATSUEI MARU NO8 Fishing 431245000 9775191 LASPALMAS
- MATSUEIMARU NO.28 Fishing 431029558 — CLASS B
- MATSUEIMARU NO1 Fishing 431028739 — CLASS B
- MATSUGENMARU Pleasure craft 431028812 — —
- MATSUKAZE Tug 431025884 — —
- MATSUKAZE Fishing 431026743 — —
- MATSUKAZE2 Fishing 431021244 — —
- MATSUMARU Tanker 431010268 — JP SKD
- MATSUO Tanker 431010002 — CLASS B
- MATSUOMARU Fishing 431031295 — —
- MATSUSAKI MARU NO.18 Cargo 431700112 8926200 CLASS B
- MATSUSHIMA Special purpose 431005644 9755426 JP SGM
- MATSUSHIMA Tanker 431017951 9933420 JP 0IP KITSUKI OFF
- MATSUSHIMA Tug 431020909 — CLASS B
- MATSUSHIMA NO.3 Tug 431020723 — —
- MATSUSHIMA NO1 Other 431022658 — —
- MATSUSHIMA NO18 Tug 431009725 — —
- MATSUSHIMA NO7 Tug 431009724 — —
- MATSUSHIMAMARU NO.18 Tanker 431030737 1143976 JP OIP
- MATSUYAMA MARU NO.11 Tanker 431001151 9540558 JP SBK
- MATSUYAMA MARU NO.12 Tanker 431005507 9711303 JP KSM OFF
- MATSUYAMA MARU NO.15 Tanker 431023346 1027952 JP KIJ OFF
- MATSUYAMA MARU NO.8 Tanker 431000498 9426219 JP YKK/SEC.2 OFF
- MATTO3 Pleasure craft 431030875 — —
- MATUEIMARU NO.35 Fishing 431800392 — —
- MATUHUKUMARU Fishing 431012704 — CLASS B
- MATUMARU NO58 Fishing 431019074 — —
- MATUMOTO NO21MARU Fishing 431014272 — —
- MATUSAKAMARU Tanker 431021742 — CLASS B
- MATUURA MARU Cargo 431003366 9644005 CLASS B
- MAVERICK Fishing 431027612 — CLASS B
- MAY Tanker 431029743 — CLASS B
- MAYA Other 431000776 8742680 — —
- MAYA Cargo 431023117 1050507 JP HIC
- MAYA Other 431999501 — —
- MAYARO Tanker 431228000 9733703 NLRTM
- MAYASAN Tanker 431618000 9839856 JP NGO
- MAYOR Pleasure craft 431019781 — CLASS B
- MAYUMI Tug 431002259 9646340 JP KSM
- MDSTAR Pleasure craft 431021252 — —
- MEBARUSAKIMARU NO.85 Tanker 431015723 — CLASS B
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