ALFONSINO ARROW

Particulars

MMSI	431029231
Flag	Japan
Vessel type	Tug
Length overall	25 m
Beam	9 m

From her own AIS broadcasts.

Her MMSI

431029231

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 BWorked out, not reported: only Class A transponders send a status, and she sends none. Class B is the lighter kind on yachts, fishing boats and other small craft, which reports less often.
To the bow	15 m (A)
To the stern	10 m (B)
To the port side	4 m (C)
To the starboard side	5 m (D)
Heard from	AISStream
On the map since	31 Oct 2026, 00:48 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

SHINGENKAI Tanker0.2 nm
KEITEN MARU Tanker0.5 nm
NO.3WAKAMIGO0.8 nm
FEDERAL IRIS Cargo ship1.4 nm
KAIREIMARU Tug1.6 nm
NO.7,,DAIFUKU1.6 nm
SYOHOUMARU Cargo ship2.2 nm
FAIRMASTER Cargo ship2.3 nm

Where she is

Position	39.7499° N, 140.0641° E
Speed	Stopped, 0.0 knots
Local time

Voyage

From: Akita, JapanStopped here now
To: Not reported
ETA: Not reported