YAMATO MARU

Particulars

MMSI	431016181
Call sign	JD4902
Flag	Japan
Vessel type	Tug
Length overall	38 m
Beam	10 m
Draught	3 m

From her own AIS broadcasts.

Her MMSI

431016181

The first three digits, 431, are the country code of Japan: an MMSI follows a ship's flag, so a new flag brings a new number.

She broadcasts no IMO number. Only larger seagoing ships are required to have one.

Her AIS details

AIS is the radio signal a ship sends so that other ships can see her. This is what her signal tells us.

Seen from above, bow to the right, so port is the upper side. The ring is her GPS aerial, where her crew or installer said it sits. Shiptrail draws the aerial's position, not the middle of the ship.

AIS class	Class AWorked out, not reported: only Class A transponders send a status, and she sends one. Class A is the full-strength kind that large cargo and passenger ships must carry.
Status she reports	Under way under engine power
To the bow	15 m (A)
To the stern	23 m (B)
To the port side	4 m (C)
To the starboard side	6 m (D)
Destination as typed	JP YOKWhat the crew entered; the Voyage card turns it into a port.
Heard from	AISStream
On the map since	29 Oct 2026, 22:02 UTC

A, B, C and D are AIS's own names for these four distances.

From her own AIS broadcasts as the feed delivers them.

Ships near her

SUZUKAZE Tug0.1 nm
KUMANO MARU Tug0.1 nm
KIYOSUMI Tug0.1 nm
DAIAN Tug0.1 nm
SHIOTAMARU NO18 Tanker0.5 nm
AKATSUKI MARU Tanker0.5 nm
KAIYO MARU Tug0.5 nm
KUROBE MARU Tug0.7 nm

Where she is

Position	35.5035° N, 139.7764° E
Speed	Stopped, 0.0 knots
Local time

Voyage

From: Kawasaki, JapanStopped here now
To: Yokohama, JapanAbout 7.0 nm away in a straight line
ETA: 30 Dec 15:00 UTC

KawasakiYokohama