AKATSUKI

Particulars

MMSI	431019461
Call sign	JD5131
Flag	Japan
Vessel type	Tug
Length overall	37 m
Beam	12 m
Draught	3.8 m

From her own AIS broadcasts.

Her MMSI

431019461

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	17 m (A)
To the stern	20 m (B)
To the port side	8 m (C)
To the starboard side	4 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	30 Oct 2026, 06:57 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

KAMAKURA Tugunder 0.1 nm
KAIYO MARU Tugunder 0.1 nm
NOJIMA Tug0.1 nm
KANAGAWAMARU Tug0.1 nm
CHITOSE Tug0.1 nm
TSUBASA Tug0.1 nm
TOKYO Tug0.1 nm
TACHIBANA Tug0.1 nm

Where she is

Position	35.4421° N, 139.6701° E
Speed	Stopped, 0.0 knots
Local time

Voyage

From: Yokohama, JapanDeparted 30 Oct 2026 (inferred)
To: Yokohama, JapanAbout 1.1 nm away in a straight line
ETA: Not reported